How To Create Tuple With A Loop In Python

I want to create this tuple: a=(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7),(8,8,8),(9,9,9) I tried with this a=1,1,1 for i in range (2,10): a=a,(i,i,i) However it

Solution 1:

Use an extra comma in your tuples, and just join:

a = ((1,1,1),)
for i inrange(2,10):
    a = a + ((i,i,i),)

Edit: Adapting juanpa.arrivillaga's comment, if you want to stick with a loop, this is the right solution:

a = [(1,1,1)]
for i in range (2,10):
    a.append((i,i,i))
a = tuple(a)   

Solution 2:

In this case, you can create it without having to use a loop.

a = tuple((i,)*3 for i in range(1, 10))

Solution 3:

itertools.repeat can also be used here:

>>>from itertools import repeat>>>[tuple(repeat(i, 3)) for i inrange(1, 10)]
[(1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5), (6, 6, 6), (7, 7, 7), (8, 8, 8), (9, 9, 9)]

If you want the final result to be in a tuple of tuples instead of a list of tuples, you can wrap tuple again:

>>> tuple(tuple(repeat(i, 3)) for i in range(1, 10))
((1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5), (6, 6, 6), (7, 7, 7), (8, 8, 8), (9, 9, 9))

Solution 4:

A tuple is an immutable list. This means that, once you create a tuple, it cannot be modified. Read more about tuples and other sequential data types here.

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So, if you really need to change a tuple during run time:

1. Convert the tuple into a list
2. Make the necessary changes to the list
3. Convert the list back to a tuple

or

1. Create a list
2. Modify the list
3. Convert the list into a tuple

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So, in your case:

a = []
for i in range (1,10):
    a.append((i,i,i))
a = tuple(a)   
print a

Solution 5:

If I were to imitate something like this, I would have done it in the following way:

a = tuple((n,n,n) for n inrange(1,10))
print(a)

#((1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5), (6, 6, 6), (7, 7, 7), (8, 8, 8), (9, 9, 9))

This is the most simple and pythonic way to do this specific job.