how to fill blanks in df with zeros 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 "-" for nan in dataframe

df.replace(np.nan,0)

Example 3: how to replace zero value in python dataframe

nonzero_mean = df[ df.col != 0 ].mean()