Passing two arguments to a function when using filter

Question

I have a list of words . I wants to filter out words which do not have minimum length. I tried filter, but showing some error . My code is

def words_to_integer(x,y):
          return len(x)> y


print("enter the list of words : ")
listofwords =  [ str(x)  for x in input().split()]  #list of words 
minimumlength = print("enter the length ")          
z = list(filter(words_to_integer,(listofwords,minimumlength)))

print("words with length greater than ",minimumlength ,"are" ,z )

error is

 z = list(filter(words_to_integer,(listofwords,minimumlength)))
 TypeError: words_to_integer() missing 1 required positional argument: 'y'

user2390182 · Accepted Answer · 2016-04-26 11:47:57Z

2

You should look at functools.partial:

from functools import partial

z = filter(partial(words_to_integer, y=minimumlength), listofwords)

partial(words_to_integer, y=minimumlength) is the same function as words_to_integer, but with argument y being fixed at minimumlength.

answered Apr 26, 2016 at 11:47

user2390182

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Daniel Roseman · Accepted Answer · 2016-04-26 11:48:38Z

0

You can't do that. You need to pass a function that already knows about minimumlength.

One easy way to do this would be to use a lambda instead of your standalone function:

filter(lambda x: len(x) > minimumlength, listofwords)

answered Apr 26, 2016 at 11:48

Daniel Roseman

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Wombatz · Accepted Answer · 2016-04-26 11:52:24Z

0

When you type this

list(filter(words_to_integer,(listofwords,minimumlength)))

python tries to do something like this:

z = []
if words_to_integer(listofwords):
    z.append(listofwords)
if words_to_integer(minimumlength):
    z.append(minimumlength)

which will fail, because words_to_integer accepts 2 arguments, but only one was given.

You probably want something like this:

z = []
for word in listofwords:
    if words_to_integer(word):
        z.append(word)

which looks like this with filter:

z = list(filter(lambda word: words_to_integer(word, minimumlength), listofwords))

or use partial like in the other answer.

answered Apr 26, 2016 at 11:52

Wombatz

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