[英]python split pd dataframe by column
Is there a function that splits a pandas.dataframe object into multiple sub-dataframes, by a specific column value? 是否有一个函数可以通过特定的列值将pandas.dataframe对象拆分为多个子数据帧? For example, if I have
例如,如果我有
A 1
B 2
A 3
B 4
I want the result as follow: 我希望结果如下:
A 1
A 3
and 和
B 2
B 4
In R, it is the split function. 在R中,它是分裂函数。 How is it being done in python?
怎么在python中完成? I know I can use subset within a forloop.
我知道我可以在forloop中使用子集。 But is there a function does that?
但有功能吗? Thanks.
谢谢。
You can use groupby()
with list-comprehension to extract a list of sub data frames where each of them contains only a single ind
value: 您可以使用
groupby()
和list-comprehension来提取子数据框列表,其中每个子数据框只包含一个ind
值:
import pandas as pd
from StringIO import StringIO
df = pd.read_csv(StringIO("""A 1
B 2
A 3
B 4"""), sep = "\s+", names=['ind', 'value'])
lst = [g for _, g in df.groupby('ind')]
lst[0]
# ind value
#0 A 1
#2 A 3
lst[1]
# ind value
#1 B 2
#3 B 4
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.