【数据平台】dataframe一列成多列

1、场景：一列中的值出现 1|2|3|56，这样用|分割的值，需要将其转换成4列。

2、操作：

names=df['names'].str.split('|',expand=True)#多名字分列

names.columns=['ids0','ids1','ids2','ids3','ids4','ids5','ids6','ids7']#

df=df.join(names)

其中names字段的列是包含|分割的值，最后将多列合并会原dataframe里。

3、函数：

Series.str. split ( pat=None, n=-1, expand=False ) [source]

Split each string (a la re.split) in the Series/Index by givenpattern, propagating NA values. Equivalent to str.split().

Parameters:	pat : string, default None String or regular expression to split on. If None, splits on whitespace n : int, default -1 (all) None, 0 and -1 will be interpreted as return all splits expand : bool, default False If True, return DataFrame/MultiIndex expanding dimensionality. If False, return Series/Index. return_type : deprecated, use expand
Returns:	split : Series/Index or DataFrame/MultiIndex of objects