how to check if column exists in dataframe python code example

Example 1: check if column exists in dataframe

if 'A' in df.columns:

Example 2: find nan value in dataframe python

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

Example 3: pandas check if value in column is in a list

df_new[df_new['l_ext'].isin([31, 22, 30, 25, 64])]

Example 4: check if column exists in dataframe python

if 'A' in df: