【資料平臺】dataframe一列成多列
阿新 • • 發佈:2019-02-16
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']#
df=df.join(names)
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