CODEWITHSUNDEEP
python-3.xfor-looprange
Hylke
Hylke

Reputation: 181

Python 3, change range in for-loop

I am trying to make a for double for-loop where the inner loop has the same range as the i in the outer loop. This would basically be what I want, but (obviously) it doesn't work:

num = 1
totalrow = range(5)
rownum = range(num)

for i in totalrow:
    for x in rownum:
        do stuff
        num = num + 1
        print (stuff)

So what I would like to happen, is to get 5 loops, where the first loop gives 1 result, second loop gives 2 results, etc. I don't know if it's needed for more clarification, but I am trying to create the drinking game ride the bus in python and I need this loop for the pyramid round. Is it possible like this or do need to find a different way to solve this problem? Thanks in advance.

EDIT

The result I was looking for was achieved by using this code:

    for i in range(6):
        for j in range(i):
            card = random.choice(deck)
            deck.remove(card)
            print (card)

This gives me 15 cards from the deck of cards I generated. I wanted to have a double for-loop so I can tell the difference between each 'row' of cards. Right now I am not interested in the output yet, but for anyone who is, down below in the answers smarx shows a couple of nice ways to print the result.

Upvotes: 1

Views: 1388

Answers (2)

user94559
user94559

Reputation: 60143

for i in range(5):
    for j in range(i):
        print(j)

EDIT

Given the game you're trying to replicate, you may want something like this:

for i in range(4):
    for j in range(i + 1):
        print(j, end=' ')
    print()

# Output:
# 0
# 0 1
# 0 1 2
# 0 1 2 3

EDIT 2

Or perhaps this:

for i in range(4):
    print(' ' * i, end='')
    for j in range(4 - i):
        print(j, end=' ')
    print()

# Output:
# 0 1 2 3 
#  0 1 2 
#   0 1 
#    0

Upvotes: 2

Tyler Nichols
Tyler Nichols

Reputation: 196

You compute rownum only once, before entering the outer for loop -- but you actually need rownum to be different values during each iteration. That means you need to compute a new range inside the loop.

Do something like this:

for i in totalrow:
    for j in range(i):
        print(j)

This will loop in the pattern you are asking for.

Upvotes: 2

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