Replace_df_other_df.py

'''There can be a situation while cleaning the data
you might want ot replace one dataframe's value on 
certain indices with other df's values (usually cl-
eared ones) based on the index - This MIGHT help.

2 Solutions.'''

# 1. Great - Almost all time will work
df.col_to_change.update(df.col_new_value)
' As both are Series - this will work!  '

# 2. Other work around
df1['col_to_replace'].fillna(df2['all_values_col'])
# The point is - You can use  ↑ in fillna!