{"id":1154046,"date":"2025-01-13T17:46:23","date_gmt":"2025-01-13T09:46:23","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1154046.html"},"modified":"2025-01-13T17:46:25","modified_gmt":"2025-01-13T09:46:25","slug":"python%e5%a6%82%e4%bd%95%e5%8e%bb%e9%99%a4%e5%88%97%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1154046.html","title":{"rendered":"python\u5982\u4f55\u53bb\u9664\u5217\u7d22\u5f15"},"content":{"rendered":"

\"python\u5982\u4f55\u53bb\u9664\u5217\u7d22\u5f15\"<\/p>\n

\u5728Python\u4e2d\u53bb\u9664\u5217\u7d22\u5f15\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u53ef\u4ee5\u4f7f\u7528pandas<\/code>\u5e93\u4e2d\u7684\u5404\u79cd\u51fd\u6570\u548c\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u4f8b\u5982\u901a\u8fc7reset_index()<\/code>\u3001drop()<\/code>\u3001set_index()<\/code>\u7b49\u3002\u5177\u4f53\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528reset_index()\u91cd\u7f6e\u7d22\u5f15\u3001drop()\u5220\u9664\u4e0d\u9700\u8981\u7684\u7d22\u5f15\u3001set_index()\u91cd\u65b0\u8bbe\u7f6e\u7d22\u5f15\u7b49\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u89e3\u91ca\u548c\u793a\u4f8b\u3002<\/strong><\/p>\n<\/p>\n

\u4e00\u3001\u901a\u8fc7reset_index()\u91cd\u7f6e\u7d22\u5f15<\/h3>\n<\/p>\n

reset_index()<\/code>\u65b9\u6cd5\u7528\u4e8e\u91cd\u7f6e\u7d22\u5f15\uff0c\u5c06\u7d22\u5f15\u5217\u8f6c\u6362\u4e3a\u666e\u901a\u5217\uff0c\u5e76\u751f\u6210\u9ed8\u8ba4\u7684\u6574\u6570\u7d22\u5f15\u3002<\/p>\n<\/p>\n

\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n

import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.set_index('A', inplace=True)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u91cd\u7f6e\u7d22\u5f15<\/strong><\/h2>\n
df_reset = df.reset_index()<\/p>\n
print("\\n\u91cd\u7f6e\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reset)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5c06\u5217'A'<\/code>\u8bbe\u7f6e\u4e3a\u7d22\u5f15\uff0c\u7136\u540e\u901a\u8fc7reset_index()<\/code>\u65b9\u6cd5\u5c06\u5176\u91cd\u7f6e\u4e3a\u9ed8\u8ba4\u7684\u6574\u6570\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u901a\u8fc7drop()\u5220\u9664\u4e0d\u9700\u8981\u7684\u7d22\u5f15<\/h3>\n<\/p>\n
drop()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u5220\u9664\u6307\u5b9a\u7684\u5217\u3002\u82e5\u67d0\u5217\u5df2\u7ecf\u4f5c\u4e3a\u7d22\u5f15\uff0c\u53ef\u4ee5\u901a\u8fc7reset_index()<\/code>\u65b9\u6cd5\u5148\u91cd\u7f6e\u7d22\u5f15\uff0c\u518d\u4f7f\u7528drop()<\/code>\u65b9\u6cd5\u5220\u9664\u4e0d\u9700\u8981\u7684\u5217\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.set_index('A', inplace=True)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u91cd\u7f6e\u7d22\u5f15\u5e76\u5220\u9664\u4e0d\u9700\u8981\u7684\u5217<\/strong><\/h2>\n
df_reset = df.reset_index().drop(columns=['A'])<\/p>\n
print("\\n\u5220\u9664\u7d22\u5f15\u5217\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reset)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5c06\u5217'A'<\/code>\u8bbe\u7f6e\u4e3a\u7d22\u5f15\uff0c\u7136\u540e\u901a\u8fc7reset_index()<\/code>\u65b9\u6cd5\u91cd\u7f6e\u7d22\u5f15\uff0c\u5e76\u4f7f\u7528drop()<\/code>\u65b9\u6cd5\u5220\u9664\u5217'A'<\/code>\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u901a\u8fc7set_index()\u91cd\u65b0\u8bbe\u7f6e\u7d22\u5f15<\/h3>\n<\/p>\n
set_index()<\/code>\u65b9\u6cd5\u7528\u4e8e\u5c06\u6307\u5b9a\u7684\u5217\u8bbe\u7f6e\u4e3a\u7d22\u5f15\uff0c\u82e5\u4e0d\u9700\u8981\u7d22\u5f15\u5217\uff0c\u53ef\u4ee5\u5c06\u7d22\u5f15\u8bbe\u7f6e\u4e3a\u7a7a\u6216\u5176\u4ed6\u5217\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.set_index('A', inplace=True)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u91cd\u65b0\u8bbe\u7f6e\u7d22\u5f15<\/strong><\/h2>\n
df_new_index = df.set_index(pd.Index([0, 1, 2]))<\/p>\n
print("\\n\u91cd\u65b0\u8bbe\u7f6e\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_new_index)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7set_index()<\/code>\u65b9\u6cd5\u5c06\u7d22\u5f15\u8bbe\u7f6e\u4e3a\u7a7a\u7684\u7d22\u5f15\u6216\u5176\u4ed6\u65b0\u751f\u6210\u7684\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5220\u9664\u591a\u7ea7\u7d22\u5f15<\/h3>\n<\/p>\n
\u5728\u5904\u7406\u591a\u7ea7\u7d22\u5f15\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528reset_index()<\/code>\u65b9\u6cd5\u6765\u5220\u9664\u7279\u5b9a\u7ea7\u522b\u7684\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {<\/p>\n
    'A': ['foo', 'bar', 'baz', 'qux'],<\/p>\n
    'B': ['one', 'two', 'three', 'four'],<\/p>\n
    'C': [1, 2, 3, 4],<\/p>\n
    'D': [5, 6, 7, 8]<\/p>\n
}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.set_index(['A', 'B'], inplace=True)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u91cd\u7f6e\u7279\u5b9a\u7ea7\u522b\u7684\u7d22\u5f15<\/strong><\/h2>\n
df_reset_level = df.reset_index(level='A')<\/p>\n
print("\\n\u91cd\u7f6e\u7279\u5b9a\u7ea7\u522b\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reset_level)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06'A'<\/code>\u548c'B'<\/code>\u5217\u8bbe\u7f6e\u4e3a\u591a\u7ea7\u7d22\u5f15\uff0c\u7136\u540e\u901a\u8fc7reset_index(level='A')<\/code>\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u7ea7\u522b\u7684\u7d22\u5f15'A'<\/code>\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5904\u7406\u5c42\u7ea7\u7d22\u5f15\u7684DataFrame<\/h3>\n<\/p>\n
\u5728\u5904\u7406\u5c42\u7ea7\u7d22\u5f15\uff08MultiIndex\uff09\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u5220\u9664\u67d0\u4e9b\u5c42\u7ea7\u7684\u7d22\u5f15\u6216\u8005\u91cd\u65b0\u8bbe\u7f6e\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {<\/p>\n
    'A': ['foo', 'foo', 'bar', 'bar'],<\/p>\n
    'B': ['one', 'two', 'one', 'two'],<\/p>\n
    'C': [1, 2, 3, 4],<\/p>\n
    'D': [5, 6, 7, 8]<\/p>\n
}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.set_index(['A', 'B'], inplace=True)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u91cd\u7f6e\u591a\u7ea7\u7d22\u5f15<\/strong><\/h2>\n
df_reset = df.reset_index()<\/p>\n
print("\\n\u91cd\u7f6e\u591a\u7ea7\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reset)<\/p>\n
\u5220\u9664\u7279\u5b9a\u7ea7\u522b\u7684\u7d22\u5f15<\/strong><\/h2>\n
df_reset_level = df.reset_index(level='A')<\/p>\n
print("\\n\u5220\u9664\u7279\u5b9a\u7ea7\u522b\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reset_level)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06'A'<\/code>\u548c'B'<\/code>\u5217\u8bbe\u7f6e\u4e3a\u591a\u7ea7\u7d22\u5f15\uff0c\u7136\u540e\u901a\u8fc7reset_index()<\/code>\u65b9\u6cd5\u91cd\u7f6e\u591a\u7ea7\u7d22\u5f15\uff0c\u6216\u8005\u901a\u8fc7reset_index(level='A')<\/code>\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u7ea7\u522b\u7684\u7d22\u5f15'A'<\/code>\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528iloc<\/code>\u548cloc<\/code>\u65b9\u6cd5\u8fdb\u884c\u7d22\u5f15\u64cd\u4f5c<\/h3>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528iloc<\/code>\u548cloc<\/code>\u65b9\u6cd5\u5bf9DataFrame\u8fdb\u884c\u7d22\u5f15\u64cd\u4f5c\uff0c\u5220\u9664\u7279\u5b9a\u7684\u884c\u6216\u5217\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528iloc\u65b9\u6cd5\u5220\u9664\u7b2c\u4e00\u5217<\/strong><\/h2>\n
df_drop_iloc = df.iloc[:, 1:]<\/p>\n
print("\\n\u4f7f\u7528iloc\u65b9\u6cd5\u5220\u9664\u7b2c\u4e00\u5217\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_drop_iloc)<\/p>\n
\u4f7f\u7528loc\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u5217<\/strong><\/h2>\n
df_drop_loc = df.loc[:, df.columns != 'A']<\/p>\n
print("\\n\u4f7f\u7528loc\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u5217\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_drop_loc)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528iloc<\/code>\u65b9\u6cd5\u5220\u9664\u4e86\u7b2c\u4e00\u5217\uff0c\u4f7f\u7528loc<\/code>\u65b9\u6cd5\u5220\u9664\u4e86\u7279\u5b9a\u5217'A'<\/code>\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528pop<\/code>\u65b9\u6cd5\u5220\u9664\u5217<\/h3>\n<\/p>\n
pop<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u5220\u9664DataFrame\u4e2d\u7684\u7279\u5b9a\u5217\uff0c\u5e76\u8fd4\u56de\u88ab\u5220\u9664\u7684\u5217\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528pop\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u5217<\/strong><\/h2>\n
df_pop = df.copy()<\/p>\n
df_pop.pop('A')<\/p>\n
print("\\n\u4f7f\u7528pop\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u5217\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_pop)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528pop<\/code>\u65b9\u6cd5\u5220\u9664\u4e86\u5217'A'<\/code>\uff0c\u5e76\u8fd4\u56de\u5220\u9664\u7684\u5217\u5185\u5bb9\u3002<\/p>\n<\/p>\n
\u516b\u3001\u4f7f\u7528drop<\/code>\u65b9\u6cd5\u5220\u9664\u884c\u7d22\u5f15<\/h3>\n<\/p>\n
\u9664\u4e86\u5220\u9664\u5217\u7d22\u5f15\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528drop<\/code>\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u7684\u884c\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528drop\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u884c\u7d22\u5f15<\/strong><\/h2>\n
df_drop_row = df.drop(index=1)<\/p>\n
print("\\n\u4f7f\u7528drop\u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u884c\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_drop_row)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528drop<\/code>\u65b9\u6cd5\u5220\u9664\u4e86\u884c\u7d22\u5f15\u4e3a1\u7684\u884c\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u5220\u9664\u91cd\u590d\u7d22\u5f15<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5220\u9664\u91cd\u590d\u7684\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 2, 3], 'B': [4, 5, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u5220\u9664\u91cd\u590d\u7684\u884c\u7d22\u5f15<\/strong><\/h2>\n
df_unique = df.drop_duplicates(subset=['A'])<\/p>\n
print("\\n\u5220\u9664\u91cd\u590d\u884c\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_unique)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528drop_duplicates<\/code>\u65b9\u6cd5\u5220\u9664\u4e86\u91cd\u590d\u7684\u884c\u7d22\u5f15'A'<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u3001\u901a\u8fc7assign<\/code>\u65b9\u6cd5\u91cd\u65b0\u5206\u914d\u7d22\u5f15<\/h3>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528assign<\/code>\u65b9\u6cd5\u91cd\u65b0\u5206\u914d\u65b0\u7684\u7d22\u5f15\u5217\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528assign\u65b9\u6cd5\u91cd\u65b0\u5206\u914d\u7d22\u5f15\u5217<\/strong><\/h2>\n
df_assign = df.assign(New_Index=[0, 1, 2])<\/p>\n
print("\\n\u4f7f\u7528assign\u65b9\u6cd5\u91cd\u65b0\u5206\u914d\u7d22\u5f15\u5217\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_assign)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528assign<\/code>\u65b9\u6cd5\u5206\u914d\u4e86\u65b0\u7684\u7d22\u5f15\u5217'New_Index'<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u4e00\u3001\u4f7f\u7528reindex<\/code>\u65b9\u6cd5\u91cd\u65b0\u7d22\u5f15<\/h3>\n<\/p>\n
reindex<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u91cd\u65b0\u7d22\u5f15DataFrame\uff0c\u5e76\u53ef\u4ee5\u586b\u5145\u7f3a\u5931\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528reindex\u65b9\u6cd5\u91cd\u65b0\u7d22\u5f15<\/strong><\/h2>\n
df_reindex = df.reindex([0, 2])<\/p>\n
print("\\n\u4f7f\u7528reindex\u65b9\u6cd5\u91cd\u65b0\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_reindex)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528reindex<\/code>\u65b9\u6cd5\u91cd\u65b0\u7d22\u5f15\uff0c\u9009\u62e9\u4e86\u7279\u5b9a\u7684\u884c\u7d22\u5f15[0, 2]<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u4e8c\u3001\u4f7f\u7528filter<\/code>\u65b9\u6cd5\u7b5b\u9009\u7d22\u5f15<\/h3>\n<\/p>\n
filter<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u7b5b\u9009\u7279\u5b9a\u7684\u884c\u6216\u5217\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528filter\u65b9\u6cd5\u7b5b\u9009\u5217\u7d22\u5f15<\/strong><\/h2>\n
df_filter = df.filter(items=['B'])<\/p>\n
print("\\n\u4f7f\u7528filter\u65b9\u6cd5\u7b5b\u9009\u5217\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_filter)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528filter<\/code>\u65b9\u6cd5\u7b5b\u9009\u4e86\u7279\u5b9a\u7684\u5217\u7d22\u5f15'B'<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u4e09\u3001\u4f7f\u7528rename<\/code>\u65b9\u6cd5\u91cd\u547d\u540d\u7d22\u5f15<\/h3>\n<\/p>\n
rename<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u91cd\u547d\u540dDataFrame\u7684\u884c\u6216\u5217\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528rename\u65b9\u6cd5\u91cd\u547d\u540d\u5217\u7d22\u5f15<\/strong><\/h2>\n
df_rename = df.rename(columns={'A': 'Alpha', 'B': 'Beta'})<\/p>\n
print("\\n\u4f7f\u7528rename\u65b9\u6cd5\u91cd\u547d\u540d\u5217\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_rename)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528rename<\/code>\u65b9\u6cd5\u91cd\u547d\u540d\u4e86\u5217\u7d22\u5f15\uff0c\u5c06'A'<\/code>\u6539\u4e3a'Alpha'<\/code>\uff0c'B'<\/code>\u6539\u4e3a'Beta'<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u56db\u3001\u4f7f\u7528set_axis<\/code>\u65b9\u6cd5\u8bbe\u7f6e\u7d22\u5f15<\/h3>\n<\/p>\n
set_axis<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u8bbe\u7f6eDataFrame\u7684\u884c\u6216\u5217\u7d22\u5f15\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528set_axis\u65b9\u6cd5\u8bbe\u7f6e\u5217\u7d22\u5f15<\/strong><\/h2>\n
df_set_axis = df.set_axis(['Alpha', 'Beta'], axis='columns')<\/p>\n
print("\\n\u4f7f\u7528set_axis\u65b9\u6cd5\u8bbe\u7f6e\u5217\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_set_axis)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528set_axis<\/code>\u65b9\u6cd5\u8bbe\u7f6e\u4e86\u65b0\u7684\u5217\u7d22\u5f15['Alpha', 'Beta']<\/code>\u3002<\/p>\n<\/p>\n
\u5341\u4e94\u3001\u4f7f\u7528melt<\/code>\u65b9\u6cd5\u8f6c\u6362\u7d22\u5f15<\/h3>\n<\/p>\n
melt<\/code>\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u5c06DataFrame\u4ece\u5bbd\u683c\u5f0f\u8f6c\u6362\u4e3a\u957f\u683c\u5f0f\uff0c\u4ece\u800c\u6539\u53d8\u7d22\u5f15\u7ed3\u6784\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u793a\u4f8bDataFrame<\/strong><\/h2>\n
data = {'A': [1, 2, 3], 'B': [4, 5, 6]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
print("\u539f\u59cbDataFrame\uff1a")<\/p>\n
print(df)<\/p>\n
\u4f7f\u7528melt\u65b9\u6cd5\u8f6c\u6362\u7d22\u5f15<\/strong><\/h2>\n
df_melt = df.melt(id_vars=['A'], value_vars=['B'], var_name='Variable', value_name='Value')<\/p>\n
print("\\n\u4f7f\u7528melt\u65b9\u6cd5\u8f6c\u6362\u7d22\u5f15\u540e\u7684DataFrame\uff1a")<\/p>\n
print(df_melt)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528melt<\/code>\u65b9\u6cd5\u5c06DataFrame\u4ece\u5bbd\u683c\u5f0f\u8f6c\u6362\u4e3a\u957f\u683c\u5f0f\uff0c\u4ece\u800c\u6539\u53d8\u4e86\u7d22\u5f15\u7ed3\u6784\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u591a\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u53bb\u9664\u548c\u7ba1\u7406Python DataFrame\u4e2d\u7684\u5217\u7d22\u5f15\u548c\u884c\u7d22\u5f15\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u7075\u6d3b\u7684\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u53bb\u9664DataFrame\u7684\u5217\u7d22\u5f15\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u4f7f\u7528Pandas\u5e93\u53ef\u4ee5\u8f7b\u677e\u53bb\u9664DataFrame\u7684\u5217\u7d22\u5f15\u3002\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eDataFrame.columns<\/code>\u4e3aNone<\/code>\u6216\u8005\u4f7f\u7528DataFrame.reset_index(drop=True, axis=1)<\/code>\u6765\u5b9e\u73b0\u3002\u8fd9\u6837\u505a\u4f1a\u5c06\u5217\u7d22\u5f15\u66ff\u6362\u4e3a\u9ed8\u8ba4\u7684\u6574\u6570\u7d22\u5f15\uff0c\u4ece\u800c\u8fbe\u5230\u53bb\u9664\u7684\u6548\u679c\u3002<\/p>\n
\u53bb\u9664\u5217\u7d22\u5f15\u540e\uff0c\u5982\u4f55\u4fdd\u5b58DataFrame\uff1f<\/strong>
\u53bb\u9664\u5217\u7d22\u5f15\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528DataFrame.to_csv()<\/code>\u65b9\u6cd5\u5c06\u5176\u4fdd\u5b58\u4e3aCSV\u6587\u4ef6\u3002\u5728\u4fdd\u5b58\u65f6\uff0c\u786e\u4fdd\u8bbe\u7f6eindex=False<\/code>\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u5c06\u7d22\u5f15\u5199\u5165\u6587\u4ef6\u4e2d\u3002\u4f8b\u5982\uff1adf.to_csv('filename.csv', index=False)<\/code>\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u6587\u4ef6\u4e2d\u53ea\u6709\u6570\u636e\uff0c\u6ca1\u6709\u7d22\u5f15\u5217\u3002<\/p>\n
\u53bb\u9664\u5217\u7d22\u5f15\u5bf9\u6570\u636e\u5206\u6790\u6709\u4ec0\u4e48\u5f71\u54cd\uff1f<\/strong>
\u53bb\u9664\u5217\u7d22\u5f15\u53ef\u80fd\u4f1a\u5f71\u54cd\u6570\u636e\u7684\u53ef\u8bfb\u6027\u548c\u5206\u6790\u7684\u4fbf\u5229\u6027\u3002\u6ca1\u6709\u5217\u7d22\u5f15\u65f6\uff0c\u53ef\u80fd\u96be\u4ee5\u8bc6\u522b\u6570\u636e\u7684\u542b\u4e49\uff0c\u56e0\u6b64\u5728\u5904\u7406\u6570\u636e\u65f6\uff0c\u5e94\u6839\u636e\u5177\u4f53\u60c5\u51b5\u51b3\u5b9a\u662f\u5426\u9700\u8981\u53bb\u9664\u3002\u540c\u65f6\uff0c\u53ef\u4ee5\u8003\u8651\u5728\u6570\u636e\u53ef\u89c6\u5316\u65f6\u6dfb\u52a0\u9002\u5f53\u7684\u6807\u7b7e\uff0c\u4ee5\u4fbf\u4e8e\u7406\u89e3\u548c\u89e3\u91ca\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u53bb\u9664\u5217\u7d22\u5f15\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u53ef\u4ee5\u4f7f\u7528pandas\u5e93\u4e2d\u7684\u5404\u79cd\u51fd\u6570\u548c\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u4f8b\u5982\u901a\u8fc7reset_i […]","protected":false},"author":3,"featured_media":1154052,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1154046"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1154046"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1154046\/revisions"}],"predecessor-version":[{"id":1154055,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1154046\/revisions\/1154055"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1154052"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1154046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1154046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1154046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}