Python 从数据帧中的所有行提取子字符串

我有一个pd.DataFrame，如下所示：

pd.DataFrame(["SSDILFJKSIDHFKJSHDKUFH", "SLIDFSOIUDHFIUSDHF", "K<NFSKJGHSDUFSDK"], ["SKDJF", "FDKSJFSSDF", "SIDFDS"])

---

pd.DataFrame（[“SSDILFJKSIDHFKJSHDKUFH”、“slidefsoiudhfiusdhf”、“K您可以尝试使用
apply

df
Out[115]: 
        index                       0
0       SKDJF  SSDILFJKSIDHFKJSHDKUFH
1  FDKSJFSSDF      SLIDFSOIUDHFIUSDHF
2      SIDFDS        K<NFSKJGHSDUFSDK
df.apply(lambda x : x[0][len(x['index'])],axis=1)
Out[116]: 
0    F
1    H
2    J
dtype: object

这是使用列表理解的一种方法：

df = pd.DataFrame({'A': ["SSDILFJKSIDHFKJSHDKUFH", "SLIDFSOIUDHFIUSDHF",
                         "K<NFSKJGHSDUFSDK"]},
                  index=["SKDJF", "FDKSJFSSDF", "SIDFDS"])

df['B'] = [j[1:i+1] for i, j in zip(s.index.map(len), s.values)]

print(df)

                                 A           B
SKDJF       SSDILFJKSIDHFKJSHDKUFH       SDILF
FDKSJFSSDF      SLIDFSOIUDHFIUSDHF  LIDFSOIUDH
SIDFDS            K<NFSKJGHSDUFSDK      <NFSKJ

df=pd.DataFrame（{'A'：[“SSDILFJKSIDHFKJSHDKUFH”，“slidefsoiudhfiusdhf”，
“你能为你要做的事情添加一些伪代码吗？
df = pd.DataFrame({'A': ["SSDILFJKSIDHFKJSHDKUFH", "SLIDFSOIUDHFIUSDHF",
                         "K<NFSKJGHSDUFSDK"]},
                  index=["SKDJF", "FDKSJFSSDF", "SIDFDS"])

df['B'] = [j[1:i+1] for i, j in zip(s.index.map(len), s.values)]

print(df)

                                 A           B
SKDJF       SSDILFJKSIDHFKJSHDKUFH       SDILF
FDKSJFSSDF      SLIDFSOIUDHFIUSDHF  LIDFSOIUDH
SIDFDS            K<NFSKJGHSDUFSDK      <NFSKJ