Python 检查变量是否为数据框
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check if variable is dataframe
提问by trbck
when my function f is called with a variable I want to check if var is a pandas dataframe:
当我的函数 f 被一个变量调用时，我想检查 var 是否是一个熊猫数据框：
def f(var):
if var == pd.DataFrame():
print "do stuff"
I guess the solution might be quite simple but even with
我想解决方案可能很简单，但即使有
def f(var):
if var.values != None:
print "do stuff"
I can't get it to work like expected.
我无法让它像预期的那样工作。
采纳答案by Jakub M.
Use isinstance, nothing else:
使用isinstance，没有别的：
if isinstance(x, pd.DataFrame):
... # do something
PEP8says explicitly that isinstanceis the preferred way to check types
PEP8明确表示这isinstance是检查类型的首选方法
No: type(x) is pd.DataFrame
No: type(x) == pd.DataFrame
Yes: isinstance(x, pd.DataFrame)
And don't even think about
甚至不要想
if obj.__class__.__name__ = 'DataFrame':
expect_problems_some_day()
isinstancehandles inheritance (see What are the differences between type() and isinstance()?). For example, it will tell you if a variable is a string (either stror unicode), because they derive from basestring)
isinstance处理继承（请参阅type() 和 isinstance() 之间的区别是什么？）。例如，它会告诉你一个变量是否是一个字符串（或者str或unicode），因为它们派生自basestring)
if isinstance(obj, basestring):
i_am_string(obj)
Specifically for pandasDataFrameobjects:
专门针对pandasDataFrame对象：
import pandas as pd
isinstance(var, pd.DataFrame)
回答by Rutger Kassies
Use the built-in isinstance()function.
使用内置isinstance()函数。
import pandas as pd
def f(var):
if isinstance(var, pd.DataFrame):
print("do stuff")
