[英]how to write user-defined column names to a csv file using pandas?
Is is possible to write my own column names when writing a pivot table to a csv file? 将透视表写入CSV文件时,可以写自己的列名吗?
import pandas as pd
c1 = ['a','a','a','a','b','b','b','b']
c2 = ['x','x','y','y','x','x','y','y']
c3 = [1, 2, 1, 2, 1, 2, 1, 2]
val = [85, 47, 29, 93, 15, 21, 65, 16]
df = pd.DataFrame({'c1':c1, 'c2':c2, 'c3':c3, 'val':val})
ptable = pd.pivot_table(data=df, cols=['c2','c3'], rows='c1')
I tried to use the header
parameter: 我尝试使用header
参数:
ptable.to_csv('test.csv', header=['n1','n2','n3','n4'])
but the column names weren't changed... 但列名没有改变...
Here is a work-around: Change the columns of ptable
before calling to_csv
: 解决方法:在调用to_csv
之前更改ptable
的列:
ptable = pd.pivot_table(data=df, cols=['c2','c3'], rows='c1')
ptable.columns = ['n1','n2','n3','n4']
ptable.to_csv('/tmp/test.csv')
Just rename before writing: 只是在写之前重命名:
ptable.columns=['n1','n2','n3','n4']
ptable.to_csv(r'c:\data\test.csv')
It should in fact work passing the list for the header
parameter, not sure why, could be a bug 实际上,它应该通过传递header
参数的列表来工作,但不确定为什么,这可能是一个错误
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