Removing tuples from a list

Question

I\'m trying to remove a tuple from a list. If the first element in the list equals \"-NONE-\" I want to remove the whole tuple. I keep getting an error when I try different th

Answer 1

Instead of defining your own filter function, use the built-in function:

z = [('uh', 'UH'), ('i', 'PRP'), ('think', 'VBP'), (',', ','), ('*0*', '-NONE-'), ('it', 'PRP'), ("'s", 'BES'), ('because', 'IN'), ('i', 'PRP'), ('get', 'VBP'), ('*', '-NONE-'), ('to', 'TO'), ('be', 'VB'), ('something', 'NN'), ('that', 'WDT'), ('i', 'PRP'), ("'m", 'VBP'), ('not', 'RB'), ('*T*', '-NONE-'), ('.', '.')]
z_filtered = filter(lambda item: item[1] != '-NONE-', z)

Or use itertools.ifilter():

import itertools as it
filtered = list(it.ifilter(lambda item: item[1] != '-NONE-', z))

Those are both a bit slower than @Blckknght's or @user2357112's list comprehension. This is competitive though:

def f(z):
    for item in z:
        if item[1] != '-NONE-':
            yield item
filtered = list(f(z))