So I have file:
Ben cat 15
John dog 17
Harry hamster 3
How to make 3 lists:
[Ben, John, Harry]
[cat, dog, hamster]
[15, 17, 3]
I have tried everything, but I haven't find a solution yet.
I am using Python 3.3.0
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John Smith
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1Could you show an example of what you have tried? – David Robinson Jan 19 '13 at 20:46
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Also, are you trying to make 3 lists in separate variables or a list of lists? – David Robinson Jan 19 '13 at 20:47
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@DavidRobinson I have tried to split and readlines and etc – John Smith Jan 19 '13 at 20:47
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@DavidRobinson 3 separate lists – John Smith Jan 19 '13 at 20:48
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@DavidRobinson lists = [i.strip().split() for i in open("file.txt").readlines()] – John Smith Jan 19 '13 at 20:49
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1@JohnSmith Please post the actual code you tried when you tried *everything*, and please prefer editing your question instead of using the comments to do so. – kojiro Jan 19 '13 at 20:56
3 Answers
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with open("file.txt") as inf:
# divide into tab delimited lines
split_lines = [l[:-1].split() for l in inf]
# create 3 lists using zip
lst1, lst2, lst3 = map(list, zip(*split_lines))
David Robinson
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2@JohnSmith: Not if your input file is what you put above. What are the actual contents of your file? – David Robinson Jan 19 '13 at 20:54
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The following:
ll = [l.split() for l in open('file.txt')]
l1, l2, l3 = map(list, zip(*ll))
print(l1)
print(l2)
print(l3)
produces:
['Ben', 'John', 'Harry']
['cat', 'dog', 'hamster']
['15', '17', '3']
NPE
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The inability of OP to go from a list of three lists to three separate lists is tangential to the question *and* why we can't have nice things. – kojiro Jan 19 '13 at 21:09
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@Mike also, if you want to be pedantic about what OP asked for, he asked for two lists of barewords and one list of numbers. Unless there are objects named `Ben`, `John`, `Harry`, `cat`, `dog`, and `hamster` already in scope it's unlikely this is actually what he meant. I think @NPE's (and my) responses were reasonable. – kojiro Jan 19 '13 at 21:17
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gsi-17382 ~ $ cat file
Ben cat 15
John dog 17
Harry hamster 3
gsi-17382 ~ $ python
Python 2.7.2 (default, Jun 20 2012, 16:23:33)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> zip(*[l.split() for l in open('file')])
[('Ben', 'John', 'Harry'), ('cat', 'dog', 'hamster'), ('15', '17', '3')]
>>> names, animals, numbers = map(list, zip(*[l.split() for l in open('file')]))
>>> numbers = map(int, numbers)
>>> names
['Ben', 'John', 'Harry']
>>> animals
['cat', 'dog', 'hamster']
>>> numbers
[15, 17, 3]
kojiro
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1Read the question again. This is not the result the user asked for. – David Robinson Jan 19 '13 at 20:50
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