I have a large text file that reads like
Kyle 40
Greg 91
Reggie 58
How would I convert this to an array that looks like this
array = ([Kyle, 40], [Greg, 91], [Reggie, 58])
Thanks in advance.
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As @Cosmologicon mentions below, you probably want your array to be a list of tuples, not a tuple of lists. Read up on the difference here: docs.python.org/tutorial/datastructures.html, stackoverflow.com/questions/626759/…Eric Wilson– Eric Wilson2011-07-12 15:49:25 +00:00Commented Jul 12, 2011 at 15:49
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4 Answers
Assuming proper input:
array = []
with open('file.txt', 'r') as f:
for line in f:
name, value = line.split()
value = int(value)
array.append((name, value))
10 Comments
Keith Michael
This doesn't work for me... I'm using Python 2.7 if that makes a difference.
Cosmologicon
It's not clear from the OP, but you may want to convert the second item to an int. Also the OP's "array" is a tuple of lists, whereas yours is a list of tuples. List of tuples is probably the better way to do it.
Keith Michael
Python claims I have invalid syntax on line 3, "with open('data.txt', 'r') as f: " . It specifically points to the word "open".
Manny D
@Cosmo, I assumed he meant list of tuples, OP, please clarify otherwise. Also @Keith,
open should work unless you have it redefined somewhere else.Keith Michael
Open just isn't working at all... I tried putting it in a different program and it again claimed I had a syntax error.
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Alternative to Manny's solution:
with open('file.txt', 'r') as f:
myarray = [line.split() for line in f]
for line in f ismore idiomatic thanfor line in f.read()
Output is in the form:
myarray = [['Kyle', '40'], ['Greg', '91'], ['Reggie', '58']]
2 Comments
Steven Rumbalski
strip() is not needed as split() will ignore excess whitespace. For example, ' red\n\r\t blue \n'.split() gives ['red', 'blue'].Steven Rumbalski
@Keith Michael: If you really need a tuple of lists then change the second line to
myarray = tuple([line.split() for line in f])... or even shorter than presented in the accepted answer:
array = [(name, int(i)) for name,i in open(file)]
Comments
Open the file, read in each line, strip the newline character off the end, split it in the space character, then convert the second value into an int:
array = [(name, int(number)) for name, number in
(line.strip().split() for line in open('textfile'))]
