Creating tuples using for..in loops in python

Question

How can I create a tuple using a for in loop in python? I tried running the following:

>>> x = (i for i in range(15))
>>> x
<generator object <genexpr> at 0x00000198CAC95A40>

But this gives a generator object instead of a tuple. Any ideas on how to get this? Not just needed to get the sequence of ints from 0 to 14 but other operations as well.

Apart from the empty tuple `()`, it is the *comma* that defines a tuple, not the parentheses that might surround the tuple literal. — chepner, Apr 02 '18 at 17:37
@chepner Yeah! I forgot about that. Parenthesis are also for expressions and in this case it's being treated like a statement. I now remember I had read about this some time ago when finding how to create a single element tuple. Like: `(1,)` — ayushgp, Apr 02 '18 at 17:40

score 4 · Accepted Answer · answered Apr 02 '18 at 17:32

4

Use the tuple() constructor:

x = tuple(i for i in range(5))
assert x == (0,1,2,3,4)

answered Apr 02 '18 at 17:32

Robᵩ

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score 3 · Answer 2 · answered Apr 02 '18 at 17:34

3

You don't actually need the generator here at all; tuple(range(5)) will work.

answered Apr 02 '18 at 17:34

Daniel Roseman

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Creating tuples using for..in loops in python

2 Answers2