616 lines
20 KiB
Plaintext
616 lines
20 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"# -- 将数据框命名为crime\n",
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"# -- 每一列(column)的数据类型是什么样的?\n",
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"# -- 将Year的数据类型转换为 datetime64\n",
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"# -- 将列Year设置为数据框的索引\n",
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"# -- 删除名为Total的列\n",
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"# -- 按照Year(每十年)对数据框进行分组并求和\n",
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"# -- 何时是美国历史上生存最危险的年代?"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 22,
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"metadata": {},
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"outputs": [],
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"source": [
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"import pandas as pd\n",
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"#将数据框命名为drinks\n",
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"crime = pd.read_csv('data/US_Crime_Rates_1960_2014.csv',index_col=0)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"<class 'pandas.core.frame.DataFrame'>\n",
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"Int64Index: 55 entries, 0 to 54\n",
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"Data columns (total 12 columns):\n",
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"Year 55 non-null int64\n",
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"Population 55 non-null int64\n",
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"Total 55 non-null int64\n",
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"Violent 55 non-null int64\n",
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"Property 55 non-null int64\n",
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"Murder 55 non-null int64\n",
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"Forcible_Rape 55 non-null int64\n",
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"Robbery 55 non-null int64\n",
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"Aggravated_assault 55 non-null int64\n",
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"Burglary 55 non-null int64\n",
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"Larceny_Theft 55 non-null int64\n",
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"Vehicle_Theft 55 non-null int64\n",
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"dtypes: int64(12)\n",
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"memory usage: 5.6 KB\n"
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]
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}
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],
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"source": [
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"#每一列(column)的数据类型是什么样的?\n",
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"crime.info()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 24,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/html": [
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"<style scoped>\n",
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" <thead>\n",
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" <tr style=\"text-align: right;\">\n",
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" <th></th>\n",
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" <th>Population</th>\n",
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" <th>Total</th>\n",
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" <th>Violent</th>\n",
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" <th>Property</th>\n",
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" <th>Murder</th>\n",
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" <th>Forcible_Rape</th>\n",
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" <th>Robbery</th>\n",
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" <th>Aggravated_assault</th>\n",
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" <th>Burglary</th>\n",
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" <th>Larceny_Theft</th>\n",
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" <th>Vehicle_Theft</th>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>Year</th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" </tr>\n",
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" </thead>\n",
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" <tbody>\n",
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" <tr>\n",
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" <th>1960-01-01</th>\n",
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" <td>179323175</td>\n",
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" <td>3384200</td>\n",
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" <td>288460</td>\n",
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" <td>3095700</td>\n",
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" <td>9110</td>\n",
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" <td>17190</td>\n",
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" <td>107840</td>\n",
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" <td>154320</td>\n",
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" <td>912100</td>\n",
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" <td>1855400</td>\n",
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" <td>328200</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1961-01-01</th>\n",
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" <td>182992000</td>\n",
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" <td>3488000</td>\n",
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" <td>289390</td>\n",
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" <td>3198600</td>\n",
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" <td>8740</td>\n",
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" <td>17220</td>\n",
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" <td>106670</td>\n",
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" <td>156760</td>\n",
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" <td>949600</td>\n",
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" <td>1913000</td>\n",
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" <td>336000</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1962-01-01</th>\n",
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" <td>185771000</td>\n",
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" <td>3752200</td>\n",
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" <td>301510</td>\n",
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" <td>3450700</td>\n",
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" <td>8530</td>\n",
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" <td>17550</td>\n",
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" <td>110860</td>\n",
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" <td>164570</td>\n",
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" <td>994300</td>\n",
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" <td>2089600</td>\n",
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" <td>366800</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1963-01-01</th>\n",
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" <td>188483000</td>\n",
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" <td>4109500</td>\n",
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" <td>316970</td>\n",
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" <td>3792500</td>\n",
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" <td>8640</td>\n",
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" <td>17650</td>\n",
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" <td>116470</td>\n",
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" <td>174210</td>\n",
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" <td>1086400</td>\n",
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" <td>2297800</td>\n",
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" <td>408300</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1964-01-01</th>\n",
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" <td>191141000</td>\n",
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" <td>4564600</td>\n",
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" <td>364220</td>\n",
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" <td>4200400</td>\n",
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" <td>9360</td>\n",
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" <td>21420</td>\n",
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" <td>130390</td>\n",
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" <td>203050</td>\n",
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" <td>1213200</td>\n",
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" <td>2514400</td>\n",
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" <td>472800</td>\n",
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" </tr>\n",
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" </tbody>\n",
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"</table>\n",
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"</div>"
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],
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"text/plain": [
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" Population Total Violent Property Murder Forcible_Rape \\\n",
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"Year \n",
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"1960-01-01 179323175 3384200 288460 3095700 9110 17190 \n",
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"1961-01-01 182992000 3488000 289390 3198600 8740 17220 \n",
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"1962-01-01 185771000 3752200 301510 3450700 8530 17550 \n",
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"1963-01-01 188483000 4109500 316970 3792500 8640 17650 \n",
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"1964-01-01 191141000 4564600 364220 4200400 9360 21420 \n",
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"\n",
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" Robbery Aggravated_assault Burglary Larceny_Theft \\\n",
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"Year \n",
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"1960-01-01 107840 154320 912100 1855400 \n",
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"1961-01-01 106670 156760 949600 1913000 \n",
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"1962-01-01 110860 164570 994300 2089600 \n",
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"1963-01-01 116470 174210 1086400 2297800 \n",
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"1964-01-01 130390 203050 1213200 2514400 \n",
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"\n",
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" Vehicle_Theft \n",
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"Year \n",
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"1960-01-01 328200 \n",
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"1961-01-01 336000 \n",
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"1962-01-01 366800 \n",
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"1963-01-01 408300 \n",
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"1964-01-01 472800 "
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]
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},
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"execution_count": 24,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"#将Year的数据类型转换为 datetime64\n",
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"crime.Year = pd.to_datetime(crime.Year,format='%Y')\n",
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"#将列Year设置为数据框的索引\n",
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"crime = crime.set_index('Year',drop=True)\n",
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"crime.head()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 25,
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"metadata": {},
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{
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"data": {
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" <thead>\n",
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" <th></th>\n",
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" <th>Population</th>\n",
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" <th>Violent</th>\n",
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" <th>Property</th>\n",
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" <th>Murder</th>\n",
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" <th>Forcible_Rape</th>\n",
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" <th>Robbery</th>\n",
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" <th>Aggravated_assault</th>\n",
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" <th>Burglary</th>\n",
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" <th>Larceny_Theft</th>\n",
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" <th>Vehicle_Theft</th>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>Year</th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" </tr>\n",
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" </thead>\n",
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" <tbody>\n",
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" <tr>\n",
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" <th>1960-01-01</th>\n",
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" <td>179323175</td>\n",
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" <td>288460</td>\n",
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" <td>3095700</td>\n",
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" <td>9110</td>\n",
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" <td>17190</td>\n",
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" <td>107840</td>\n",
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" <td>154320</td>\n",
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" <td>912100</td>\n",
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" <td>1855400</td>\n",
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" <td>328200</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1961-01-01</th>\n",
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" <td>182992000</td>\n",
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" <td>289390</td>\n",
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" <td>3198600</td>\n",
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" <td>8740</td>\n",
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" <td>17220</td>\n",
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" <td>106670</td>\n",
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" <td>156760</td>\n",
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" <td>949600</td>\n",
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" <td>1913000</td>\n",
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" <td>336000</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1962-01-01</th>\n",
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" <td>185771000</td>\n",
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" <td>301510</td>\n",
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" <td>3450700</td>\n",
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" <td>8530</td>\n",
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" <td>17550</td>\n",
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" <td>110860</td>\n",
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" <td>164570</td>\n",
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" <td>994300</td>\n",
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" <td>2089600</td>\n",
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" <td>366800</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1963-01-01</th>\n",
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" <td>188483000</td>\n",
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" <td>316970</td>\n",
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" <td>3792500</td>\n",
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" <td>8640</td>\n",
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" <td>17650</td>\n",
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" <td>116470</td>\n",
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" <td>174210</td>\n",
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" <td>1086400</td>\n",
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" <td>2297800</td>\n",
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" <td>408300</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1964-01-01</th>\n",
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" <td>191141000</td>\n",
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" <td>364220</td>\n",
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" <td>4200400</td>\n",
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" <td>9360</td>\n",
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" <td>21420</td>\n",
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" <td>130390</td>\n",
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" <td>203050</td>\n",
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" <td>1213200</td>\n",
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" <td>2514400</td>\n",
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" <td>472800</td>\n",
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" </tr>\n",
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" </tbody>\n",
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"</table>\n",
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"</div>"
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],
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"text/plain": [
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" Population Violent Property Murder Forcible_Rape Robbery \\\n",
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"Year \n",
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"1960-01-01 179323175 288460 3095700 9110 17190 107840 \n",
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"1961-01-01 182992000 289390 3198600 8740 17220 106670 \n",
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"1962-01-01 185771000 301510 3450700 8530 17550 110860 \n",
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"1963-01-01 188483000 316970 3792500 8640 17650 116470 \n",
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"1964-01-01 191141000 364220 4200400 9360 21420 130390 \n",
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"\n",
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" Aggravated_assault Burglary Larceny_Theft Vehicle_Theft \n",
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"Year \n",
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"1960-01-01 154320 912100 1855400 328200 \n",
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"1961-01-01 156760 949600 1913000 336000 \n",
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"1962-01-01 164570 994300 2089600 366800 \n",
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"1963-01-01 174210 1086400 2297800 408300 \n",
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"1964-01-01 203050 1213200 2514400 472800 "
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]
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||
},
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"execution_count": 25,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"#删除名为Total的列\n",
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"del crime['Total']\n",
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"crime.head()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 26,
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"metadata": {},
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"outputs": [
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{
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"data": {
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" <thead>\n",
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" <th></th>\n",
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" <th>Population</th>\n",
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" <th>Violent</th>\n",
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" <th>Property</th>\n",
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" <th>Murder</th>\n",
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" <th>Forcible_Rape</th>\n",
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" <th>Robbery</th>\n",
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" <th>Aggravated_assault</th>\n",
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" <th>Burglary</th>\n",
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" <th>Larceny_Theft</th>\n",
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" <th>Vehicle_Theft</th>\n",
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" <th>population</th>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>Year</th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" <th></th>\n",
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" </tr>\n",
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" </thead>\n",
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" <tbody>\n",
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" <tr>\n",
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" <th>1960-01-01</th>\n",
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" <td>1915053175</td>\n",
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" <td>4134930</td>\n",
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" <td>45160900</td>\n",
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" <td>106180</td>\n",
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" <td>236720</td>\n",
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" <td>1633510</td>\n",
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" <td>2158520</td>\n",
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" <td>13321100</td>\n",
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" <td>26547700</td>\n",
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" <td>5292100</td>\n",
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" <td><bound method f of DatetimeIndexResampler [fre...</td>\n",
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" </tr>\n",
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" <tr>\n",
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" <th>1970-01-01</th>\n",
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" <td>2121193298</td>\n",
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" <td>9607930</td>\n",
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" <td>91383800</td>\n",
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" <td>192230</td>\n",
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" <td>554570</td>\n",
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" <td>4159020</td>\n",
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" <td>4702120</td>\n",
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" <td>28486000</td>\n",
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" <td>53157800</td>\n",
|
||
" <td>9739900</td>\n",
|
||
" <td><bound method f of DatetimeIndexResampler [fre...</td>\n",
|
||
" </tr>\n",
|
||
" <tr>\n",
|
||
" <th>1980-01-01</th>\n",
|
||
" <td>2371370069</td>\n",
|
||
" <td>14074328</td>\n",
|
||
" <td>117048900</td>\n",
|
||
" <td>206439</td>\n",
|
||
" <td>865639</td>\n",
|
||
" <td>5383109</td>\n",
|
||
" <td>7619130</td>\n",
|
||
" <td>33073494</td>\n",
|
||
" <td>72040253</td>\n",
|
||
" <td>11935411</td>\n",
|
||
" <td><bound method f of DatetimeIndexResampler [fre...</td>\n",
|
||
" </tr>\n",
|
||
" <tr>\n",
|
||
" <th>1990-01-01</th>\n",
|
||
" <td>2612825258</td>\n",
|
||
" <td>17527048</td>\n",
|
||
" <td>119053499</td>\n",
|
||
" <td>211664</td>\n",
|
||
" <td>998827</td>\n",
|
||
" <td>5748930</td>\n",
|
||
" <td>10568963</td>\n",
|
||
" <td>26750015</td>\n",
|
||
" <td>77679366</td>\n",
|
||
" <td>14624418</td>\n",
|
||
" <td><bound method f of DatetimeIndexResampler [fre...</td>\n",
|
||
" </tr>\n",
|
||
" <tr>\n",
|
||
" <th>2000-01-01</th>\n",
|
||
" <td>2947969117</td>\n",
|
||
" <td>13968056</td>\n",
|
||
" <td>100944369</td>\n",
|
||
" <td>163068</td>\n",
|
||
" <td>922499</td>\n",
|
||
" <td>4230366</td>\n",
|
||
" <td>8652124</td>\n",
|
||
" <td>21565176</td>\n",
|
||
" <td>67970291</td>\n",
|
||
" <td>11412834</td>\n",
|
||
" <td><bound method f of DatetimeIndexResampler [fre...</td>\n",
|
||
" </tr>\n",
|
||
" </tbody>\n",
|
||
"</table>\n",
|
||
"</div>"
|
||
],
|
||
"text/plain": [
|
||
" Population Violent Property Murder Forcible_Rape Robbery \\\n",
|
||
"Year \n",
|
||
"1960-01-01 1915053175 4134930 45160900 106180 236720 1633510 \n",
|
||
"1970-01-01 2121193298 9607930 91383800 192230 554570 4159020 \n",
|
||
"1980-01-01 2371370069 14074328 117048900 206439 865639 5383109 \n",
|
||
"1990-01-01 2612825258 17527048 119053499 211664 998827 5748930 \n",
|
||
"2000-01-01 2947969117 13968056 100944369 163068 922499 4230366 \n",
|
||
"\n",
|
||
" Aggravated_assault Burglary Larceny_Theft Vehicle_Theft \\\n",
|
||
"Year \n",
|
||
"1960-01-01 2158520 13321100 26547700 5292100 \n",
|
||
"1970-01-01 4702120 28486000 53157800 9739900 \n",
|
||
"1980-01-01 7619130 33073494 72040253 11935411 \n",
|
||
"1990-01-01 10568963 26750015 77679366 14624418 \n",
|
||
"2000-01-01 8652124 21565176 67970291 11412834 \n",
|
||
"\n",
|
||
" population \n",
|
||
"Year \n",
|
||
"1960-01-01 <bound method f of DatetimeIndexResampler [fre... \n",
|
||
"1970-01-01 <bound method f of DatetimeIndexResampler [fre... \n",
|
||
"1980-01-01 <bound method f of DatetimeIndexResampler [fre... \n",
|
||
"1990-01-01 <bound method f of DatetimeIndexResampler [fre... \n",
|
||
"2000-01-01 <bound method f of DatetimeIndexResampler [fre... "
|
||
]
|
||
},
|
||
"execution_count": 26,
|
||
"metadata": {},
|
||
"output_type": "execute_result"
|
||
}
|
||
],
|
||
"source": [
|
||
"#按照Year(每十年)对数据框进行分组并求和\n",
|
||
"#按时间聚合参考博客:https://www.jb51.net/article/177325.htm\n",
|
||
"crimes = crime.resample('10AS').sum()\n",
|
||
"#人口是累计数,不能直接求和\n",
|
||
"crimes['population'] = crime.resample('10AS').max\n",
|
||
"crimes.head()"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 30,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Population 2014-01-01\n",
|
||
"Violent 1992-01-01\n",
|
||
"Property 1991-01-01\n",
|
||
"Murder 1991-01-01\n",
|
||
"Forcible_Rape 1992-01-01\n",
|
||
"Robbery 1991-01-01\n",
|
||
"Aggravated_assault 1993-01-01\n",
|
||
"Burglary 1980-01-01\n",
|
||
"Larceny_Theft 1991-01-01\n",
|
||
"Vehicle_Theft 1991-01-01\n",
|
||
"dtype: datetime64[ns]"
|
||
]
|
||
},
|
||
"execution_count": 30,
|
||
"metadata": {},
|
||
"output_type": "execute_result"
|
||
}
|
||
],
|
||
"source": [
|
||
"#何时是美国历史上生存最危险的年代?\n",
|
||
"crime.idxmax()"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {},
|
||
"outputs": [],
|
||
"source": []
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {},
|
||
"outputs": [],
|
||
"source": []
|
||
}
|
||
],
|
||
"metadata": {
|
||
"kernelspec": {
|
||
"display_name": "Python 3",
|
||
"language": "python",
|
||
"name": "python3"
|
||
},
|
||
"language_info": {
|
||
"codemirror_mode": {
|
||
"name": "ipython",
|
||
"version": 3
|
||
},
|
||
"file_extension": ".py",
|
||
"mimetype": "text/x-python",
|
||
"name": "python",
|
||
"nbconvert_exporter": "python",
|
||
"pygments_lexer": "ipython3",
|
||
"version": "3.6.1"
|
||
}
|
||
},
|
||
"nbformat": 4,
|
||
"nbformat_minor": 4
|
||
}
|