How to remove all integer values from a list in python

Question

I am just a beginner in python and I want to know is it possible to remove all the integer values from a list? For example the document goes like

['1','introduction','to','molecular','8','the','learning','module','5']

After the removal I want the document to look like:

['introduction','to','molecular','the','learning','module']

Answer 1

To remove all integers, do this:

no_integers = [x for x in mylist if not isinstance(x, int)]

However, your example list does not actually contain integers. It contains only strings, some of which are composed only of digits. To filter those out, do the following:

no_integers = [x for x in mylist if not (x.isdigit() 
                                         or x[0] == '-' and x[1:].isdigit())]

Alternately:

is_integer = lambda s: s.isdigit() or (s[0] == '-' and s[1:].isdigit())
no_integers = filter(is_integer, mylist)

Answer 2

You can do this, too:

def int_filter( someList ):
    for v in someList:
        try:
            int(v)
            continue # Skip these
        except ValueError:
            yield v # Keep these

list( int_filter( items ))

Why? Because int is better than trying to write rules or regular expressions to recognize string values that encode an integer.