check for nan values in pandas dataframe code example

Example 1: dataframe find nan rows

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

Example 2: find nan value in dataframe python

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

Example 3: pandas nan values in column

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

Example 4: pandas if nan, then the row above

df.fillna(method='ffill')