# remember in 4.py above, we put the data is in a dataframe, countries.

# 1. 
print(countries.loc['FR'])
# 2. above returns a series
#     Country               France
#     Capital                Paris
#     PopulationMillions        11
#     Name: FR, dtype: object

# 3.
print(countries.loc[['FR']])
# 4. above retruns a dataframe
#          Country Capital  PopulationMillions
#     Code                                    
#     FR    France   Paris                  11

# 5.
print(countries.loc[['CA', 'BR', 'CH']])
# 6. above returns
#         Country   Capital  PopulationMillions
#     Code                                      
#     CA    Canada    Ottawa                  37
#     BR    Brazil  Brasilia                 211
#     CH     China   Beijing                1000

# 7.
print(countries.loc['BR':'CH']) # is same print(countries.loc['BR':'CH':1])
# 8. above returns
#         Country   Capital  PopulationMillions
#     Code                                      
#     BR    Brazil  Brasilia                 211
#     CH     China   Beijing                1000

# 9.
print(countries.loc['CA'::2])
# 10. above returns
#          Country  Capital  PopulationMillions
#     Code                                     
#     CA    Canada   Ottawa                  37
#     CH     China  Beijing                1000