How to convert a list of longs into a comma separated string in python

Question

Hi,

I'm new to python, and have a list of longs which I want to join together into a comma separated string.

In PHP I'd do something like this:

$output = implode(",", $array)

In Python, I'm not sure how to do this. I've tried using join, but this doesn't work since the elements are the wrong type (i.e., not strings). Do I need to create a copy of the list and convert each element in the copy from a long into a string? Or is there a simpler way to do it?

Thanks,

Ben

Answer 1

You have to convert the ints to strings and then you can join them:

','.join([str(i) for i in list_of_ints])

Answer 2

You can use map to transform a list, then join them up.

",".join( map( str, list_of_things ) )

BTW, this works for any objects (not just longs).

Answer 3

You can omit the square brackets from heikogerlach's answer since Python 2.5, I think:

','.join(str(i) for i in list_of_ints)

This is extremely similar, but instead of building a (potentially large) temporary list of all the strings, it will generate them one at a time, as needed by the join function.

Answer 4

Just for the sake of it, you can also use string formatting:

",".join("%s" % i for i in list_of_things)

Answer 5

and yet another version more (pretty cool, eh?)

str(list_of_numbers)[1:-1]