作者 | Roman Orac
转自 | 量子位 编译 | 鱼羊
Pandas实用技巧
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;"><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> numpy <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> np<br /><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> pandas <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> pd<br /><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> random<br /><br />n = <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">10</span><br />df = pd.DataFrame(<br /> {<br /> <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"col1"</span>: np.random.random_sample(n),<br /> <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"col2"</span>: np.random.random_sample(n),<br /> <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"col3"</span>: [[random.randint(<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">0</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">10</span>) <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">for</span> _ <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">in</span> range(random.randint(<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">5</span>))] <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">for</span> _ <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">in</span> range(n)],<br /> }<br />)<br /></section><section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df_html = df.to_html()<br /><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">with</span> open(‘analysis.html’, ‘w’) <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> f: f.write(df_html)</section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df.to_latex()</section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">print(df.to_markdown())</section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df.to_excel(‘analysis.xlsx’)<br /></section><section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df.to_string()<br /></section>5个鲜为人知的Pandas技巧
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;"><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> pandas <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> pd<br />date_from = “<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">2019-01-01</span>”<br />date_to = “<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">2019-01-12</span>”<br />date_range = pd.date_range(date_from, date_to, freq=”D”)<br />print(date_range)</section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df_merge = left.merge(right, on = ‘key’, how = ‘left’, indicator = <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">True</span>)<br /></section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">pd.merge_asof(trades, quotes, on=”timestamp”, by=’ticker’, tolerance=pd.Timedelta(‘<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">10</span>ms’), direction=‘backward’)<br /></section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;"><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> numpy <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> np<br /><span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">import</span> pandas <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">as</span> pd<br /><br />df = pd.DataFrame(np.array([[<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">3</span>], [<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">4</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">6</span>], [<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">7</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">8</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">9</span>]]), columns=[<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"a"</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"b"</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;">"c"</span>])<br /><br />report_name = <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> example_report.xlsx</span><br />sheet_name = <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> Sheet1</span><br />writer = pd.ExcelWriter(report_name, engine=<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> xlsxwriter </span>)<br />df.to_excel(writer, sheet_name=sheet_name, index=<span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">False</span>)<br /></section><section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;"><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># define the workbook</span><br />workbook = writer.book<br />worksheet = writer.sheets[sheet_name]<br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># create a chart line object</span><br />chart = workbook.add_chart({<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> type </span>: <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> line </span>})<br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># configure the series of the chart from the spreadsheet</span><br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># using a list of values instead of category/value formulas:</span><br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># [sheetname, first_row, first_col, last_row, last_col]</span><br />chart.add_series({<br /> <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> categories </span>: [sheet_name, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">0</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">0</span>],<br /> <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> values </span>: [sheet_name, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">1</span>],<br />})<br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># configure the chart axes</span><br />chart.set_x_axis({<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> name </span>: <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> Index </span>, <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> position_axis </span>: <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> on_tick </span>})<br />chart.set_y_axis({<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> name </span>: <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> Value </span>, <span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> major_gridlines </span>: {<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> visible </span>: <span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">False</span>}})<br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># place the chart on the worksheet</span><br />worksheet.insert_chart(<span style="font-size: inherit;line-height: inherit;color: rgb(181, 189, 104);overflow-wrap: inherit !important;word-break: inherit !important;"> E2 </span>, chart)<br /><span style="font-size: inherit;line-height: inherit;color: rgb(150, 152, 150);overflow-wrap: inherit !important;word-break: inherit !important;"># output the excel file</span><br />writer.save()<br /></section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df = pd.DataFrame(pd.np.random.randn(<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">50000</span>,<span style="font-size: inherit;line-height: inherit;color: rgb(222, 147, 95);overflow-wrap: inherit !important;word-break: inherit !important;">300</span>))<br />df.to_csv(‘random_data.csv’, index=<span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">False</span>)<br /></section><section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df.to_csv(‘random_data.gz’, compression=’gzip’, index=<span style="font-size: inherit;line-height: inherit;color: rgb(178, 148, 187);overflow-wrap: inherit !important;word-break: inherit !important;">False</span>)<br /></section>
<section style="line-height: 18px;font-size: 14px;letter-spacing: 0px;font-family: Consolas, Inconsolata, Courier, monospace;border-radius: 0px;background: rgb(29, 31, 33);color: rgb(197, 200, 198);padding: 0.5em;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow: auto !important;display: -webkit-box !important;">df = pd.read_csv(‘random_data.gz’)<br /></section>作者系网易新闻·网易号“各有态度”签约作者
<pre style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><p style="max-width: 100%;letter-spacing: 0.544px;white-space: normal;color: rgb(0, 0, 0);font-family: -apple-system-font, system-ui, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;widows: 1;line-height: 1.75em;margin-left: 0px;margin-right: 0px;padding-left: 0em;padding-right: 0em;text-align: center;box-sizing: border-box !important;overflow-wrap: break-word !important;"><strong style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;letter-spacing: 0.5px;font-size: 14px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><strong style="max-width: 100%;font-size: 16px;letter-spacing: 0.544px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;letter-spacing: 0.5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">—</span></strong>完<strong style="max-width: 100%;font-size: 16px;letter-spacing: 0.544px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;letter-spacing: 0.5px;font-size: 14px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><strong style="max-width: 100%;font-size: 16px;letter-spacing: 0.544px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="max-width: 100%;letter-spacing: 0.5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">—</span></strong></span></strong></span></strong></p><section style="max-width: 100%;letter-spacing: 0.544px;white-space: normal;font-family: -apple-system-font, system-ui, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;widows: 1;box-sizing: border-box !important;overflow-wrap: break-word 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