如何提取字符串中的特定单词

Question

我有dataframe像波纹管

Data1                Data2
Andy_23_1985          0.78
John_24_1985          0.78

您知道我如何使用Python提取第二个单词吗？

Data1                Data2    Age
Andy_23_1985          0.78    23
John_24_1985          0.78    24

Answer 1

您可以将str.split()与expand=True一起使用：

df = pd.DataFrame({'Data1':['Andy_23_1985', 'John_24_1985'], 'Data2':[0.78, 0.78]})

df['Age'] = df['Data1'].str.split('_', expand=True)[1]

print(df)

打印：

          Data1  Data2 Age
0  Andy_23_1985   0.78  23
1  John_24_1985   0.78  24

Answer 2

尝试一下：

df = pd.read_clipboard()   # I copy/pasted you dataframe
df['Age'] = df.Data1.str.extract(r'(\d+)') 

or more precise if you don't want the first match:

df['Age'] = df.Data1.str.extract(r'_(\d\d)_')

          Data1  Data2 Age
0  Andy_23_1985   0.78  23
1  John_24_1985   0.78  24