replace nan by empty string 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 "-" for nan in dataframe

df.replace(np.nan,0)

Example 3: python pandas replace nan with null

df.fillna('', inplace=True)