Pandas Dataframe: Finding entries that share values (e.g. all games that contain a player)











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I have a CSV file of game history for my badminton club. I would like to be able to find out information about games that contain a given player (e.g. who did "Bill" play most with?). Here's an example of what two rounds of three games might look like:



import pandas as pd
player_data = player_data = pd.DataFrame(data=[
('2018-06-12', 1, 1, 1, 'Adam'),
('2018-06-12', 1, 1, 2, 'Bill'),
('2018-06-12', 1, 1, 3, 'Cindy'),
('2018-06-12', 1, 1, 4, 'Derek'),
('2018-06-12', 1, 2, 1, 'Edward'),
('2018-06-12', 1, 2, 2, 'Fred'),
('2018-06-12', 1, 2, 3, 'George'),
('2018-06-12', 1, 2, 4, 'Harry'),
('2018-06-12', 1, 3, 1, 'Ian'),
('2018-06-12', 1, 3, 2, 'Jack'),
('2018-06-12', 1, 3, 3, 'Karl'),
('2018-06-12', 1, 3, 4, 'Laura'),
('2018-06-12', 2, 1, 1, 'Karl'),
('2018-06-12', 2, 1, 2, 'Cindy'),
('2018-06-12', 2, 1, 3, 'Bill'),
('2018-06-12', 2, 1, 4, 'Derek'),
('2018-06-12', 2, 2, 1, 'Max'),
('2018-06-12', 2, 2, 2, 'George'),
('2018-06-12', 2, 2, 3, 'Fred'),
('2018-06-12', 2, 2, 4, 'Ian'),
('2018-06-12', 2, 3, 1, 'Nigel'),
('2018-06-12', 3, 3, 2, 'Edward'),
('2018-06-12', 3, 3, 3, 'Harry'),
('2018-06-12', 3, 3, 4, 'Adam')],
columns=['Date', 'Round #', 'Court #', 'Space', 'Name'])


However, as each row is an individual player's entry, simply locating by name, e.g.



player_data.loc[player_data['Name'] == 'Bill']


is just going to return only Bill's individual entries, like so:



    Date    Round # Court # Space   Name

1 2018-06-12 1 1 2 Bill
14 2018-06-12 2 1 3 Bill


... when what I want is a new dataframe that contains ALL entries of games that Bill has played in, such that in this case it would display as:



Date    Round # Court # Space   Name
0 2018-06-12 1 1 1 Adam
1 2018-06-12 1 1 2 Bill
2 2018-06-12 1 1 3 Cindy
3 2018-06-12 1 1 4 Derek
12 2018-06-12 2 1 1 Karl
13 2018-06-12 2 1 2 Cindy
14 2018-06-12 2 1 3 Bill
15 2018-06-12 2 1 4 Derek


I'm thinking it might be easier to convert the original dataframe to one where each entry is a separate game with all the player names for that game listed in a tuple, so then it'd be relatively simple to check "if name in Names"? e.g.



Date    Round # Court # Names
0 2018-06-12 1 1 (Adam, Bill, Cindy, Derek)


... but maybe that'd cause other problems.










share|improve this question


























    up vote
    4
    down vote

    favorite












    I have a CSV file of game history for my badminton club. I would like to be able to find out information about games that contain a given player (e.g. who did "Bill" play most with?). Here's an example of what two rounds of three games might look like:



    import pandas as pd
    player_data = player_data = pd.DataFrame(data=[
    ('2018-06-12', 1, 1, 1, 'Adam'),
    ('2018-06-12', 1, 1, 2, 'Bill'),
    ('2018-06-12', 1, 1, 3, 'Cindy'),
    ('2018-06-12', 1, 1, 4, 'Derek'),
    ('2018-06-12', 1, 2, 1, 'Edward'),
    ('2018-06-12', 1, 2, 2, 'Fred'),
    ('2018-06-12', 1, 2, 3, 'George'),
    ('2018-06-12', 1, 2, 4, 'Harry'),
    ('2018-06-12', 1, 3, 1, 'Ian'),
    ('2018-06-12', 1, 3, 2, 'Jack'),
    ('2018-06-12', 1, 3, 3, 'Karl'),
    ('2018-06-12', 1, 3, 4, 'Laura'),
    ('2018-06-12', 2, 1, 1, 'Karl'),
    ('2018-06-12', 2, 1, 2, 'Cindy'),
    ('2018-06-12', 2, 1, 3, 'Bill'),
    ('2018-06-12', 2, 1, 4, 'Derek'),
    ('2018-06-12', 2, 2, 1, 'Max'),
    ('2018-06-12', 2, 2, 2, 'George'),
    ('2018-06-12', 2, 2, 3, 'Fred'),
    ('2018-06-12', 2, 2, 4, 'Ian'),
    ('2018-06-12', 2, 3, 1, 'Nigel'),
    ('2018-06-12', 3, 3, 2, 'Edward'),
    ('2018-06-12', 3, 3, 3, 'Harry'),
    ('2018-06-12', 3, 3, 4, 'Adam')],
    columns=['Date', 'Round #', 'Court #', 'Space', 'Name'])


    However, as each row is an individual player's entry, simply locating by name, e.g.



    player_data.loc[player_data['Name'] == 'Bill']


    is just going to return only Bill's individual entries, like so:



        Date    Round # Court # Space   Name

    1 2018-06-12 1 1 2 Bill
    14 2018-06-12 2 1 3 Bill


    ... when what I want is a new dataframe that contains ALL entries of games that Bill has played in, such that in this case it would display as:



    Date    Round # Court # Space   Name
    0 2018-06-12 1 1 1 Adam
    1 2018-06-12 1 1 2 Bill
    2 2018-06-12 1 1 3 Cindy
    3 2018-06-12 1 1 4 Derek
    12 2018-06-12 2 1 1 Karl
    13 2018-06-12 2 1 2 Cindy
    14 2018-06-12 2 1 3 Bill
    15 2018-06-12 2 1 4 Derek


    I'm thinking it might be easier to convert the original dataframe to one where each entry is a separate game with all the player names for that game listed in a tuple, so then it'd be relatively simple to check "if name in Names"? e.g.



    Date    Round # Court # Names
    0 2018-06-12 1 1 (Adam, Bill, Cindy, Derek)


    ... but maybe that'd cause other problems.










    share|improve this question
























      up vote
      4
      down vote

      favorite









      up vote
      4
      down vote

      favorite











      I have a CSV file of game history for my badminton club. I would like to be able to find out information about games that contain a given player (e.g. who did "Bill" play most with?). Here's an example of what two rounds of three games might look like:



      import pandas as pd
      player_data = player_data = pd.DataFrame(data=[
      ('2018-06-12', 1, 1, 1, 'Adam'),
      ('2018-06-12', 1, 1, 2, 'Bill'),
      ('2018-06-12', 1, 1, 3, 'Cindy'),
      ('2018-06-12', 1, 1, 4, 'Derek'),
      ('2018-06-12', 1, 2, 1, 'Edward'),
      ('2018-06-12', 1, 2, 2, 'Fred'),
      ('2018-06-12', 1, 2, 3, 'George'),
      ('2018-06-12', 1, 2, 4, 'Harry'),
      ('2018-06-12', 1, 3, 1, 'Ian'),
      ('2018-06-12', 1, 3, 2, 'Jack'),
      ('2018-06-12', 1, 3, 3, 'Karl'),
      ('2018-06-12', 1, 3, 4, 'Laura'),
      ('2018-06-12', 2, 1, 1, 'Karl'),
      ('2018-06-12', 2, 1, 2, 'Cindy'),
      ('2018-06-12', 2, 1, 3, 'Bill'),
      ('2018-06-12', 2, 1, 4, 'Derek'),
      ('2018-06-12', 2, 2, 1, 'Max'),
      ('2018-06-12', 2, 2, 2, 'George'),
      ('2018-06-12', 2, 2, 3, 'Fred'),
      ('2018-06-12', 2, 2, 4, 'Ian'),
      ('2018-06-12', 2, 3, 1, 'Nigel'),
      ('2018-06-12', 3, 3, 2, 'Edward'),
      ('2018-06-12', 3, 3, 3, 'Harry'),
      ('2018-06-12', 3, 3, 4, 'Adam')],
      columns=['Date', 'Round #', 'Court #', 'Space', 'Name'])


      However, as each row is an individual player's entry, simply locating by name, e.g.



      player_data.loc[player_data['Name'] == 'Bill']


      is just going to return only Bill's individual entries, like so:



          Date    Round # Court # Space   Name

      1 2018-06-12 1 1 2 Bill
      14 2018-06-12 2 1 3 Bill


      ... when what I want is a new dataframe that contains ALL entries of games that Bill has played in, such that in this case it would display as:



      Date    Round # Court # Space   Name
      0 2018-06-12 1 1 1 Adam
      1 2018-06-12 1 1 2 Bill
      2 2018-06-12 1 1 3 Cindy
      3 2018-06-12 1 1 4 Derek
      12 2018-06-12 2 1 1 Karl
      13 2018-06-12 2 1 2 Cindy
      14 2018-06-12 2 1 3 Bill
      15 2018-06-12 2 1 4 Derek


      I'm thinking it might be easier to convert the original dataframe to one where each entry is a separate game with all the player names for that game listed in a tuple, so then it'd be relatively simple to check "if name in Names"? e.g.



      Date    Round # Court # Names
      0 2018-06-12 1 1 (Adam, Bill, Cindy, Derek)


      ... but maybe that'd cause other problems.










      share|improve this question













      I have a CSV file of game history for my badminton club. I would like to be able to find out information about games that contain a given player (e.g. who did "Bill" play most with?). Here's an example of what two rounds of three games might look like:



      import pandas as pd
      player_data = player_data = pd.DataFrame(data=[
      ('2018-06-12', 1, 1, 1, 'Adam'),
      ('2018-06-12', 1, 1, 2, 'Bill'),
      ('2018-06-12', 1, 1, 3, 'Cindy'),
      ('2018-06-12', 1, 1, 4, 'Derek'),
      ('2018-06-12', 1, 2, 1, 'Edward'),
      ('2018-06-12', 1, 2, 2, 'Fred'),
      ('2018-06-12', 1, 2, 3, 'George'),
      ('2018-06-12', 1, 2, 4, 'Harry'),
      ('2018-06-12', 1, 3, 1, 'Ian'),
      ('2018-06-12', 1, 3, 2, 'Jack'),
      ('2018-06-12', 1, 3, 3, 'Karl'),
      ('2018-06-12', 1, 3, 4, 'Laura'),
      ('2018-06-12', 2, 1, 1, 'Karl'),
      ('2018-06-12', 2, 1, 2, 'Cindy'),
      ('2018-06-12', 2, 1, 3, 'Bill'),
      ('2018-06-12', 2, 1, 4, 'Derek'),
      ('2018-06-12', 2, 2, 1, 'Max'),
      ('2018-06-12', 2, 2, 2, 'George'),
      ('2018-06-12', 2, 2, 3, 'Fred'),
      ('2018-06-12', 2, 2, 4, 'Ian'),
      ('2018-06-12', 2, 3, 1, 'Nigel'),
      ('2018-06-12', 3, 3, 2, 'Edward'),
      ('2018-06-12', 3, 3, 3, 'Harry'),
      ('2018-06-12', 3, 3, 4, 'Adam')],
      columns=['Date', 'Round #', 'Court #', 'Space', 'Name'])


      However, as each row is an individual player's entry, simply locating by name, e.g.



      player_data.loc[player_data['Name'] == 'Bill']


      is just going to return only Bill's individual entries, like so:



          Date    Round # Court # Space   Name

      1 2018-06-12 1 1 2 Bill
      14 2018-06-12 2 1 3 Bill


      ... when what I want is a new dataframe that contains ALL entries of games that Bill has played in, such that in this case it would display as:



      Date    Round # Court # Space   Name
      0 2018-06-12 1 1 1 Adam
      1 2018-06-12 1 1 2 Bill
      2 2018-06-12 1 1 3 Cindy
      3 2018-06-12 1 1 4 Derek
      12 2018-06-12 2 1 1 Karl
      13 2018-06-12 2 1 2 Cindy
      14 2018-06-12 2 1 3 Bill
      15 2018-06-12 2 1 4 Derek


      I'm thinking it might be easier to convert the original dataframe to one where each entry is a separate game with all the player names for that game listed in a tuple, so then it'd be relatively simple to check "if name in Names"? e.g.



      Date    Round # Court # Names
      0 2018-06-12 1 1 (Adam, Bill, Cindy, Derek)


      ... but maybe that'd cause other problems.







      python python-3.x pandas






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 15 at 1:49









      Plato's Cave

      327




      327
























          2 Answers
          2






          active

          oldest

          votes

















          up vote
          3
          down vote



          accepted










          After the filter using merge



          s1=player_data.loc[player_data['Name'] == 'Bill',['Date','Round #','Court #']]
          s2=s1.merge(player_data,how='left')
          s2
          Out[12]:
          Date Round # Court # Space Name
          0 2018-06-12 1 1 1 Adam
          1 2018-06-12 1 1 2 Bill
          2 2018-06-12 1 1 3 Cindy
          3 2018-06-12 1 1 4 Derek
          4 2018-06-12 2 1 1 Karl
          5 2018-06-12 2 1 2 Cindy
          6 2018-06-12 2 1 3 Bill
          7 2018-06-12 2 1 4 Derek





          share|improve this answer




























            up vote
            0
            down vote













            My method for this is :



            bill_player_data = player_data.loc[player_data['Name'] == 'Bill']
            ro = bill_player_data['Round #']
            co = bill_player_data['Court #']
            bill = player_data.loc[player_data['Round #'].isin(ro)]
            bill = bill.loc[bill['Court #'].isin(co)]
            bill





            share|improve this answer























            • This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
              – Plato's Cave
              Nov 15 at 2:19










            • sorry, edited the code. I forgot to group the cour, cheers
              – Railey Shahril
              Nov 15 at 2:43











            Your Answer






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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            3
            down vote



            accepted










            After the filter using merge



            s1=player_data.loc[player_data['Name'] == 'Bill',['Date','Round #','Court #']]
            s2=s1.merge(player_data,how='left')
            s2
            Out[12]:
            Date Round # Court # Space Name
            0 2018-06-12 1 1 1 Adam
            1 2018-06-12 1 1 2 Bill
            2 2018-06-12 1 1 3 Cindy
            3 2018-06-12 1 1 4 Derek
            4 2018-06-12 2 1 1 Karl
            5 2018-06-12 2 1 2 Cindy
            6 2018-06-12 2 1 3 Bill
            7 2018-06-12 2 1 4 Derek





            share|improve this answer

























              up vote
              3
              down vote



              accepted










              After the filter using merge



              s1=player_data.loc[player_data['Name'] == 'Bill',['Date','Round #','Court #']]
              s2=s1.merge(player_data,how='left')
              s2
              Out[12]:
              Date Round # Court # Space Name
              0 2018-06-12 1 1 1 Adam
              1 2018-06-12 1 1 2 Bill
              2 2018-06-12 1 1 3 Cindy
              3 2018-06-12 1 1 4 Derek
              4 2018-06-12 2 1 1 Karl
              5 2018-06-12 2 1 2 Cindy
              6 2018-06-12 2 1 3 Bill
              7 2018-06-12 2 1 4 Derek





              share|improve this answer























                up vote
                3
                down vote



                accepted







                up vote
                3
                down vote



                accepted






                After the filter using merge



                s1=player_data.loc[player_data['Name'] == 'Bill',['Date','Round #','Court #']]
                s2=s1.merge(player_data,how='left')
                s2
                Out[12]:
                Date Round # Court # Space Name
                0 2018-06-12 1 1 1 Adam
                1 2018-06-12 1 1 2 Bill
                2 2018-06-12 1 1 3 Cindy
                3 2018-06-12 1 1 4 Derek
                4 2018-06-12 2 1 1 Karl
                5 2018-06-12 2 1 2 Cindy
                6 2018-06-12 2 1 3 Bill
                7 2018-06-12 2 1 4 Derek





                share|improve this answer












                After the filter using merge



                s1=player_data.loc[player_data['Name'] == 'Bill',['Date','Round #','Court #']]
                s2=s1.merge(player_data,how='left')
                s2
                Out[12]:
                Date Round # Court # Space Name
                0 2018-06-12 1 1 1 Adam
                1 2018-06-12 1 1 2 Bill
                2 2018-06-12 1 1 3 Cindy
                3 2018-06-12 1 1 4 Derek
                4 2018-06-12 2 1 1 Karl
                5 2018-06-12 2 1 2 Cindy
                6 2018-06-12 2 1 3 Bill
                7 2018-06-12 2 1 4 Derek






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 15 at 1:53









                W-B

                97.2k73162




                97.2k73162
























                    up vote
                    0
                    down vote













                    My method for this is :



                    bill_player_data = player_data.loc[player_data['Name'] == 'Bill']
                    ro = bill_player_data['Round #']
                    co = bill_player_data['Court #']
                    bill = player_data.loc[player_data['Round #'].isin(ro)]
                    bill = bill.loc[bill['Court #'].isin(co)]
                    bill





                    share|improve this answer























                    • This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                      – Plato's Cave
                      Nov 15 at 2:19










                    • sorry, edited the code. I forgot to group the cour, cheers
                      – Railey Shahril
                      Nov 15 at 2:43















                    up vote
                    0
                    down vote













                    My method for this is :



                    bill_player_data = player_data.loc[player_data['Name'] == 'Bill']
                    ro = bill_player_data['Round #']
                    co = bill_player_data['Court #']
                    bill = player_data.loc[player_data['Round #'].isin(ro)]
                    bill = bill.loc[bill['Court #'].isin(co)]
                    bill





                    share|improve this answer























                    • This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                      – Plato's Cave
                      Nov 15 at 2:19










                    • sorry, edited the code. I forgot to group the cour, cheers
                      – Railey Shahril
                      Nov 15 at 2:43













                    up vote
                    0
                    down vote










                    up vote
                    0
                    down vote









                    My method for this is :



                    bill_player_data = player_data.loc[player_data['Name'] == 'Bill']
                    ro = bill_player_data['Round #']
                    co = bill_player_data['Court #']
                    bill = player_data.loc[player_data['Round #'].isin(ro)]
                    bill = bill.loc[bill['Court #'].isin(co)]
                    bill





                    share|improve this answer














                    My method for this is :



                    bill_player_data = player_data.loc[player_data['Name'] == 'Bill']
                    ro = bill_player_data['Round #']
                    co = bill_player_data['Court #']
                    bill = player_data.loc[player_data['Round #'].isin(ro)]
                    bill = bill.loc[bill['Court #'].isin(co)]
                    bill






                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited Nov 15 at 2:42

























                    answered Nov 15 at 2:10









                    Railey Shahril

                    184




                    184












                    • This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                      – Plato's Cave
                      Nov 15 at 2:19










                    • sorry, edited the code. I forgot to group the cour, cheers
                      – Railey Shahril
                      Nov 15 at 2:43


















                    • This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                      – Plato's Cave
                      Nov 15 at 2:19










                    • sorry, edited the code. I forgot to group the cour, cheers
                      – Railey Shahril
                      Nov 15 at 2:43
















                    This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                    – Plato's Cave
                    Nov 15 at 2:19




                    This didn't work: the 'bill' dataframe was the same as the original 'player_data' dataframe
                    – Plato's Cave
                    Nov 15 at 2:19












                    sorry, edited the code. I forgot to group the cour, cheers
                    – Railey Shahril
                    Nov 15 at 2:43




                    sorry, edited the code. I forgot to group the cour, cheers
                    – Railey Shahril
                    Nov 15 at 2:43


















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