pandas replace for every row code example

Example 1: .replace pandas in for loop

df_media_input['MediaChannel'].replace(replacements, inplace=True)

Example 2: pandas change every row to df

for i, row in df.iterrows():
    ifor_val = something
    if <condition>:
        ifor_val = something_else
    df.at[i,'ifor'] = ifor_val