python – 替换pandas单元格中的字符

我有以下数据帧：

df = pd.DataFrame(columns=["a","b","c"])
df.loc[1] = [1,2,3]
df.loc[2] = ["123.12", "3455,435",0]
df.loc[3] = [23.2, 55.5,0.1]
df.loc[4] = ["1,3","3,5","7.8"]

并且我想用点(“.”)替换所有逗号(“,”),结果如下所示：

df = pd.DataFrame(columns=["a","b","c"])
df.loc[1] = [1,2,3]
df.loc[2] = ["123.12", "3455.435",0]
df.loc[3] = [23.2, 55.5,0.1]
df.loc[4] = ["1.3","3.5","7.8"]

我怎样才能做到这一点？到目前为止,我已经使用了pandas替换功能,但它没有用.

解决方法:

对于子字符串替换,使用replace和regex = True：

df = df.replace(',','.', regex=True)
print (df)
        a         b    c
1       1         2    3
2  123.12  3455.435    0
3    23.2      55.5  0.1
4     1.3       3.5  7.8