how to replace all nans in data with 0 in pandas code example

Example 1: how to replace nan with 0 in pandas

df['product']=df['product'].fillna(0)
df['context']=df['context'].fillna(0)
df

Example 2: replace all nan values in dataframe

# Replacing all nan values with 0 in Dataframe
df = df.fillna(0)