search for nan values pandas code example

Example 1: dataframe find nan rows

df[df.isnull().any(axis=1)]

Example 2: 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 3: find nan values in a column pandas

df['your column name'].isnull().sum()

Example 4: find nan value in dataframe python

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

Example 5: to detect if a data frame has nan values

> df.isnull().any().any()
True