python - 想要将整数和 float 与包含不同字符串的列分开

Question

我试图从字符串列中仅提取整数和 float 我努力了 data['new'] = data['text'].str.extract(r'^\d+\.\d+$')

Answer 1

如果需要仅提取带有数字的值:

data = pd.DataFrame({'text':['20','45.45','ss4','7.4ds','dr']})
data['new'] = data['text'].str.extract(r'^(\d+\.\d+|\d+)$')
print (data)
    text    new
0     20     20
1  45.45  45.45
2    ss4    NaN
3  7.4ds    NaN
4     dr    NaN

然后转换为 float :

data['new'] = data['text'].str.extract(r'^(\d+\.\d+|\d+)$').astype(float)
print (data)
    text    new
0     20  20.00
1  45.45  45.45
2    ss4    NaN
3  7.4ds    NaN
4     dr    NaN

或者使用to_numeric功能:

data['new'] = pd.to_numeric(data['text'], errors='coerce')
print (data)
    text    new
0     20  20.00
1  45.45  45.45
2    ss4    NaN
3  7.4ds    NaN
4     dr    NaN