python - 计算 pandas DataFrame 中的所有 NaN

Question

我正在尝试计算 pandas 系列中的 NaN 元素（数据类型类 'numpy.float64'），以了解有多少数据类型是类 'pandas.core.series.Series'

这是为了计算熊猫系列中的空值

import pandas as pd
oc=pd.read_csv(csv_file)
oc.count("NaN")

我的预期输出为oc,count("NaN")7 但它显示'Level NaN must be same as name (None)'

标签： pythonpandasdataframe

Answer 1

The argument to count isn't what you want counted (it's actually the axis name or index).

You're looking for df.isna().values.sum() (to count NaNs across the entire DataFrame), or len(df) - df['column'].count() (to count NaNs in a specific column).