成功解决：ValueError: Of the four parameters: start, end, periods, and freq, exactly three must be specif

成功解决：ValueError: Of the four parameters: start, end, periods, and freq, exactly three must be specified

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报错问题

我的代码：

import pandas as pd
import numpy as np

print(pd.date_range(start='20221001', end='20220601', periods=5, freq='D'))

报错问题：

Traceback (most recent call last):
  File "E:/Python/2.py", line 4, in <module>
    print(pd.date_range(start='20221001', end='20220601', periods=5, freq='D'))
  File "D:\Python3.8\lib\site-packages\pandas\core\indexes\datetimes.py", line 1070, in date_range
    dtarr = DatetimeArray._generate_range(
  File "D:\Python3.8\lib\site-packages\pandas\core\arrays\datetimes.py", line 405, in _generate_range
    raise ValueError(
ValueError: Of the four parameters: start, end, periods, and freq, exactly three must be specified

报错原因

报错内容翻译：ValueError：在四个参数中：start、end、periods和freq，必须指定三个参数

报错原因：start，end，periods，freq这4个参数只能设置3个，否则会报错

解决方法

1. 去掉periods参数

import pandas as pd
import numpy as np

print(pd.date_range(start='20221001', end='20220601', freq='D'))

运行结果：

DatetimeIndex([], dtype='datetime64[ns]', freq='D')

2. 去掉freq参数

import pandas as pd
import numpy as np

print(pd.date_range(start='20221001', end='20220601', periods=5))

运行结果：

DatetimeIndex(['2022-10-01 00:00:00', '2022-08-31 12:00:00',
               '2022-08-01 00:00:00', '2022-07-01 12:00:00',
               '2022-06-01 00:00:00'],
              dtype='datetime64[ns]', freq=None)