1、場景：一列中的值出現 1|2|3|56，這樣用|分割的值，需要將其轉換成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']#

其中names欄位的列是包含|分割的值，最後將多列合併會原dataframe裡。

3、函式：

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