How do I remove hyphens from a nested list?

Question

In the nested list:

x = [['0', '-', '3', '2'], ['-', '0', '-', '1', '3']]

how do I remove the hyphens?

x = x.replace("-", "")

gives me AttributeError: 'list' object has no attribute 'replace', and

print x.remove("-")

gives me ValueError: list.remove(x): x not in list.

Python is actually documented: http://docs.python.org/library/stdtypes.html#typesseq-mutable — jogojapan, Apr 25 '12 at 03:37

score 1 · Answer 1 · edited May 23 '17 at 12:03

1

x is a list of lists. replace() will substitute a pattern string for another within a string. What you want is to remove an item from a list. remove() will remove the first occurrence of an item. A simple approach:

for l in x:
    while ("-" in l):
        l.remove("-")

For more advanced solutions, see the following: Remove all occurrences of a value from a Python list

edited May 23 '17 at 12:03

Community

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1

answered Apr 25 '12 at 03:32

David Cain

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You truly are the king of kings! Thanks! – Don Christopher Arntz Apr 25 '12 at 03:39
You're welcome. I'm inclined to agree with @jogojapan, though- Python's documentation is quite extensive, and this is a simple question. Try to do some research next time. – David Cain Apr 25 '12 at 03:40
Sorry, I tried that too. I should have included that error as well. – Don Christopher Arntz Apr 25 '12 at 03:46

How do I remove hyphens from a nested list?

1 Answers1