当我打印清单上的项目时，如何编号？

Question

I am redoing an assignment I have not gotten a perfect score on and I seem to not understand how to label my list with numbers, also trying to print it on the same line.

I've tried adding numbers into my list so categorize but that it was not my mentor wants. She is asking for me number the items in the list using a for loop counter.

games = ["Super Mario Maker 2", "Bayonetta 3", "Dark Souls 4", "Astral Chain", "Persona 5 Royale"]

for n in range(0, len(games)):
    print("Game: " + games[n])

Currently this prints out everything in the list from star to finish. It starts out with Game: (1st item in list) and so forth. I'm trying to figure out how to label these as they go forth so that it would print something like Game 1: (1st item), Game 2: (2nd item) and so forth, printing everything on a single line with commas in between.

Answer 1

With enumerate :

for idx, val in enumerate(games): 
      print('{}: {}'.format(idx, val))
# Out:
# Game 0: Super Mario Maker 2
# Game 1: Bayonetta 3
# Game 2: Dark Souls 4
# Game 3: Astral Chain
# Game 4: Persona 5 Royale

Or using the enumerate option start :

for idx, val in enumerate(games, start=1): 
    print('{}: {}'.format(idx, val))
# Out:
# Game 1: Super Mario Maker 2
# Game 2: Bayonetta 3
# Game 3: Dark Souls 4
# Game 4: Astral Chain
# Game 5: Persona 5 Royale

In one line:

print(*['Game {}: {}'.format(i, v) for i,v in enumerate(games, start=1)], sep='\n')  

Answer 2

Use enumerate :

for counter, value in enumerate(some_list):
    print(counter, value)

So, for your example:

for i, game in enumerate(games):
   print("Game {0}: {1}".format(i+1, game))

For Python 3.6 or later:

for i, game in enumerate(games):
    print(f"Game {i + 1}: {game}")

As you can also see, f-strings are very useful and come in handy for what you're trying to do!

EDIT: printing as a single line:

print(', '.join([f"Game {i + 1}: {game}" for i, game in enumerate(games)]))

Answer 3

You can print all items on a list using join and format string based on the index of each item in the list.

', '.join(f'Game {i+1}: {games[i]}' for i in range(len(games)))

Result:

'Game 1: Super Mario Maker 2, Game 2: Bayonetta 3, Game 3: Dark Souls 4, Game 4: Astral Chain, Game 5: Persona 5 Royale'

Answer 4

Add n to the output.

for n in range(0, len(games)): 
    print("Game {}: {}".format(n, games[n]))

Answer 5

It's actually really simple, you can just use:

• enumerate with the optional start argument to get the indexes starting from 1

• a generator expression to loop over the values of the list

• an f-string to insert the variables to a string

• str.join to concatenate the elements to one string with commas in between

games = ["Super Mario Maker 2", "Bayonetta 3", "Dark Souls 4", "Astral Chain", "Persona 5 Royale"]

print(', '.join(f'Game {i}: {game}' for i, game in (enumerate(games, start=1))))

Output:

 Game 1: Super Mario Maker 2, Game 2: Bayonetta 3, Game 3: Dark Souls 4, Game 4: Astral Chain, Game 5: Persona 5 Royale 

Answer 6

add this after game in the string

str(n+1) 

so it should be like this

'game '+str(n+1) +' rest of the string'