如何检查 pandas 系列是否为空? [英] How to check if pandas Series is empty?

问题描述

如何检查pandas系列是否为空?

How to check if pandas Series is empty?

我已经尝试过了:

如何检查pandas DataFrame是否为空?

但是似乎Series没有属性'isempty'.

but it seems that Series has no property 'isempty'.

推荐答案

我使用len函数.它比empty()快得多. len(df.index)甚至更快.

I use len function. It's much faster than empty(). len(df.index) is even faster.

import pandas as pd
import numpy as np

df = pd.DataFrame(np.random.randn(10000, 4), columns=list('ABCD'))

def empty(df):
    return df.empty

def lenz(df):
    return len(df) == 0

def lenzi(df):
    return len(df.index) == 0

'''
%timeit empty(df)
%timeit lenz(df)
%timeit lenzi(df)

10000 loops, best of 3: 13.9 µs per loop
100000 loops, best of 3: 2.34 µs per loop
1000000 loops, best of 3: 695 ns per loop

len on index seems to be faster
'''

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