[英]How to split a column into multiple columns with the index of the string with pandas?
I have data frame, it looks like: 我有数据框,它看起来像:
df = pd.DataFrame({"a":["sea001", "seac002"]})
print(df)
a
0 sea001
1 seac002
I want to split the a column into two columns, the first three characters in column "b", the rest in column "c" 我想将一列分为两列,列“ b”中的前三个字符,列“ c”中的其余字符
a b c
0 sea001 sea 001
1 seac002 sea c002
I want to use df.a.str.split(), but there is no option for me to separate the words after the index. 我想使用df.a.str.split(),但是我没有选择在索引后面分隔单词。 How can I do this cleverly? 我该如何巧妙地做到这一点?
You can use str
with slicing semantics to do this: 您可以将str
与切片语义一起使用来执行此操作:
In [102]:
df['b'], df['c'] = df['a'].str[:3], df['a'].str[3:]
df
Out[102]:
a b c
0 sea001 sea 001
1 seac002 sea c002
try .str.extract() method: 尝试.str.extract()方法:
In [104]: df[['b','c']] = df.a.str.extract(r'(.{3})(.*)', expand=True)
In [105]: df
Out[105]:
a b c
0 sea001 sea 001
1 seac002 sea c002
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