Question

对于测试，我想模拟 datetime.datetime.now() 以使测试不受时间变化的影响。这似乎与某些熊猫功能发生冲突：

import pytest
import datetime
import pandas as pd

mockdate = datetime.datetime(2000, 1, 1, 0, 0, 0)

    
def function_to_test():
    date = datetime.datetime.now()
  
    df = pd.DataFrame({'date': ['20000101', '20100101'],
                   'offset': [2, 3]})
    df["date"] = df["date"].apply(lambda x: datetime.datetime.strptime(x, '%Y%m%d'))
    b = pd.to_datetime(df["date"]) +  pd.to_timedelta(df['offset'], "d")

    return date, b

def test_function_to_test(mocker):  
    with patch(__name__ + '.datetime') as mock_date:
        mock_date.datetime.now.return_value = mockdate
        date, b = function_to_test()

    assert date == mockdate
    assert any(b)

这产生：

test.py:19: in function_to_test
    b = pd.to_datetime(df["date"]) +  pd.to_timedelta(df['offset'], "d")
/opt/miniconda/envs/AR_env3/lib/python3.7/site-packages/pandas/core/tools/datetimes.py:451: in to_datetime
    values = _convert_listlike(arg._values, True, format)
/opt/miniconda/envs/AR_env3/lib/python3.7/site-packages/pandas/core/tools/datetimes.py:368: in _convert_listlike
    require_iso8601=require_iso8601
pandas/_libs/tslib.pyx:492: in pandas._libs.tslib.array_to_datetime
    ???
pandas/_libs/tslib.pyx:744: in pandas._libs.tslib.array_to_datetime
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   TypeError: <class 'unittest.mock.MagicMock'> is not convertible to datetime

我知道 strptime 可能不适合此目的，但我在其他地方需要它。

谢谢！！

模拟 datetime.datetime.now() 时熊猫日期时间失败

0 个答案: