python find nan in dataframe code example

Example 1: find position of nan pandas

# position of NaN values in terms of index
df.loc[pandas.isna(df["b"]), :].index

# position of NaN values in terms of rows that cotnain NaN
df.loc[pandas.isna(df["b"]), :]

Example 2: find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()

Example 3: how to get the amount of nan values in a data fram

#where A is the name of the column
#where df is the name of the dataframe
count = df["A"].isna().sum()