find nan in a column pandas code example

Example 1: count nan pandas

#Python, pandas
#Count missing values for each column of the dataframe df

df.isnull().sum()

Example 2: find nan values in a column pandas

df.isnull().values.any()

Example 3: check if a value in dataframe is nan

#return a subset of the dataframe where the column name value == NaN 
df.loc[df['column name'].isnull() == True]

Example 4: to detect if a data frame has nan values

df.isnull().sum().sum()
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