数据:

In [5]: df
Out[5]:
    YOB
0  1955
1  1965
2  1975
3  1985

您不需要额外的列TodaysDate-您可以动态获取它:

you don't need an extra column TodaysDate - you can get it dynamically:

In [6]: df['Age'] = pd.datetime.now().year - df.YOB

In [7]: df
Out[7]:
    YOB  Age
0  1955   62
1  1965   52
2  1975   42
3  1985   32

或者，您可以使用 DataFrame.eval() 方法:

Alternatively you can use DataFrame.eval() method:

In [16]: df
Out[16]:
    YOB
0  1955
1  1965
2  1975
3  1985

In [17]: df.eval("Age = @pd.datetime.now().year - YOB", inplace=True)

In [18]: df
Out[18]:
    YOB  Age
0  1955   62
1  1965   52
2  1975   42
3  1985   32