Calling Python variables within a for loop

Question

Consider I have three lists, stored in file sports.py, which is separate from the .py file I'm working in:

games_1 = ["Tennis", …]
games_2 = ["Cricket", …] 
games_3 = ["Golf", …]

I also have a variable var_game == "Football".

I would like to check which lists var_game appears in. So far I have tried:

for N in range(1,3):
    if var_game in sports.games_N:
        gamesN_check = 1
    else:
        gamesN_check = 0

However, Python does not let me use N to cycle through the lists in this way. How do I need to use it with the correct syntax?

Many thanks in advance!

Use a dictionary

rafaelc
– rafaelc

2018-08-23 19:46:37 +00:00
Commented Aug 23, 2018 at 19:46 — rafaelc
– rafaelc, Commented Aug 23, 2018 at 19:46

rahlf23 · Accepted Answer · 2018-08-23 19:58:08Z

3

I would recommend packaging your lists in a dictionary and evaluating in the manner below:

games_1 = ['Tennis', 'Football', 'Basketball']
games_2 = ['Cricket', 'Football', 'Lacrosse'] 
games_3 = ['Golf','Baseball', 'Rugby', 'Track'] 

games_N = {'games_1': games_1, 'games_2': games_2, 'games_3': games_3}

var_game = 'Football'

games_N_check = {key: 1 if var_game in val else 0 for key, val in games_N.items()}

Outputs:

{'games_1': 1, 'games_2': 1, 'games_3': 0}

Additionally

A quick means to create your dictionary from a series of lists, so that you do not have to explicitly name every list:

games_lists = [['Tennis', 'Football', 'Basketball'],['Cricket', 'Football', 'Lacrosse'],['Golf','Baseball', 'Rugby', 'Track']]

games_N = {'games_{}'.format(idx+1): game_list for idx, game_list in enumerate(games_lists)}

Gives:

{'games_1': ['Tennis', 'Football', 'Basketball'], 'games_2': ['Cricket', 'Football', 'Lacrosse'], 'games_3': ['Golf', 'Baseball', 'Rugby', 'Track']}

edited Aug 23, 2018 at 19:58

answered Aug 23, 2018 at 19:51

rahlf23

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1 Comment

excom Over a year ago

This worked excellently for me, and allows the scaling up to more than 3 lists that I will need later. I wasn't aware of the dictionary function in Python (yes, I'm really that new to it). Thank you!

galfisher · Accepted Answer · 2018-08-23 19:47:36Z

0

Instead of using 3 variables for games, Why don't you make a list of list of games

games = [["Tennis", …], ["Cricket", …], ["Golf", …]]

and a list of results

games_check = []

And then check for every game in games, if var_games in game, and if so - add 0 to the list of results games_check, otherwise add 1

for game in games:
    if var_game in game:
        games_check.append(1)
    else:
        games_check.append(0)

Or to make it more 'Pythonic'

games_check = [(1 if var_game in game else 0) for game in games]

answered Aug 23, 2018 at 19:47

galfisher

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Comments

rahlf23 · Accepted Answer · 2018-08-23 20:53:01Z

0

I think for your situation, you can just do this:

if var_game in sports.games_1:
    games1_check = 1
elif var_game in sports.games_2:
    games2_check = 1
elif var_game in sports.games_3:
    games3_check = 1

edited Aug 23, 2018 at 20:53

rahlf23

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answered Aug 23, 2018 at 19:48

Zac

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1 Comment

Rushiraj Nenuji Over a year ago

What's the use of the for loop then?

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