如何根据给定值获取列的百分比

Question

我有以下数据集。我想得到Survived的百分比值，该值等于1.

     Survived                                               Name
0           0                            Braund, Mr. Owen Harris
1           1  Cumings, Mrs. John Bradley (Florence Briggs Th...
2           1                             Heikkinen, Miss. Laina
3           1       Futrelle, Mrs. Jacques Heath (Lily May Peel)
4           0                           Allen, Mr. William Henry
5           0                                   Moran, Mr. James
6           0                            McCarthy, Mr. Timothy J
7           0                     Palsson, Master. Gosta Leonard
8           1  Johnson, Mrs. Oscar W (Elisabeth Vilhelmina Berg)
9           1                Nasser, Mrs. Nicholas (Adele Achem)

我知道我可以通过此命令获取值：

train_df.loc[train_df['Survived'] == 1].shape[0] / train_df.shape[0]

但我正在寻找更好的解决方案。有没有更简单的方法呢？

Answer 1

使用pd.Series.mean

df.Survived.mean()

0.5