how to filter by 1 column and retrieve another in pytonh code example
Example 1: pandas filter rows by value in list
df.loc[df['col name'].isin(ls_conditions)]
Example 2: filter df by column value
# does year equals to 2002?
# is_2002 is a boolean variable with True or False in it
>is_2002 = gapminder['year']==2002
>print(is_2002.head())
0 False
1 False
2 False
3 False
4 False