如何检查 pandas 中是否存在列 [英] How to check if a column exists in Pandas
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问题描述
假设我有以下DataFrame:
>>>将大熊猫导入为pd
>>>从随机导入randint
>>>> df = pd.DataFrame({'A':xrange(10)中的x的[randint(1,9)],
'B':[randint(1,9)* 10 for x in xrange )],
'C':[randint(1,9)* 100 for x in xrange(10)]})
>>> df
ABC
0 3 40 100
1 6 30 200
2 7 70 800
3 3 50 200
4 7 50 400
5 4 10 400
6 3 70 500
7 8 30 200
8 3 40 800
9 6 60 200
,我想计算 df ['sum'] = df ['A'] + df ['C']
但首先我想检查是否存在 df ['A']
,如果没有,我想计算 df ['sum'] = df ['B'] + df ['C']
感谢您的帮助。
解决方案
这将工作:
如果df中的'A':
但为了清楚起见,我可能会写:
如果df.columns中的A:
Is there a way to check if a column exists in a Pandas DataFrame?
Suppose that I have the following DataFrame:
>>> import pandas as pd
>>> from random import randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in xrange(10)],
'B': [randint(1, 9)*10 for x in xrange(10)],
'C': [randint(1, 9)*100 for x in xrange(10)]})
>>> df
A B C
0 3 40 100
1 6 30 200
2 7 70 800
3 3 50 200
4 7 50 400
5 4 10 400
6 3 70 500
7 8 30 200
8 3 40 800
9 6 60 200
and I want to calculate df['sum'] = df['A'] + df['C']
but first I want to check if df['A']
exists, and if not, I want to calculate df['sum'] = df['B'] + df['C']
instead.
Thanks for the help.
解决方案
This will work:
if 'A' in df:
But for clarity, I'd probably write it as:
if 'A' in df.columns:
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