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Python 带默认日期的熊猫系列fillna_Python_Pandas - Fatal编程技术网

Python 带默认日期的熊猫系列fillna

Python 带默认日期的熊猫系列fillna,python,pandas,Python,Pandas,如何在默认日期为2015-01-01的dataframe中填写NAN值 我在这里使用什么df['SIGN\u DATE']=df['SIGN\u DATE'].fillna(?,inplace=True) >>>df.SIGN_DATE.head() 0 2012-03-28 14:14:18 1 2011-05-18 00:41:48 2 2011-06-13 16:36:58 3 nan 4 2011-05-22 23:43:56 Name:

如何在默认日期为2015-01-01的dataframe中填写NAN值

我在这里使用什么
df['SIGN\u DATE']=df['SIGN\u DATE'].fillna(?,inplace=True)

>>>df.SIGN_DATE.head()
0    2012-03-28 14:14:18
1    2011-05-18 00:41:48
2    2011-06-13 16:36:58
3    nan
4    2011-05-22 23:43:56

Name: SIGN_DATE, dtype: object
    type(df.SIGN_DATE)
pandas.core.series.Series
df['SIGN_DATE'].fillna(value=pd.to_datetime('1/1/2015'), inplace=True)