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What is the most convenient way to join a list of ints to form a str without spaces?
For example [1, 2, 3] will turn '1,2,3'. (without spaces).

I know that ','.join([1, 2, 3]) would raise a TypeError.

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3 Answers 3

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6 
print ','.join(map(str,[1, 2, 3])) #Prints: 1,2,3

Mapping str prevents the TypeError

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6 
','.join(str(x) for x in ints)

should be the most Pythonic way.

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3

I like ','.join(str(i) for i in lst), but it's really not much different than map

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4 Comments

Actually str.join will be faster with a list than with a genexp ;-)
@thefourtheye -- yes, I know. That's well documented for CPython. But in python3.x, the map becomes an iterable (non-list) anyway. Very rarely does that effect the total runtime of your program in any appreciable way though. You'd need to demonstrate that it's a bottleneck before I'd change the code I think.
You don't have to change it, but since lists will be faster, List comprehension is an option.
Yeah, it is ... But I don't like the look of the extra brackets :-)

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