CODEWITHSUNDEEP
pythonfunctionfilterarguments
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Reputation: 391

Passing two arguments to a function when using filter

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'

Upvotes: 1

Views: 83

Answers (3)

Wombatz
Wombatz

Reputation: 5458

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.

Upvotes: 0

Daniel Roseman
Daniel Roseman

Reputation: 600059

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)

Upvotes: 0

user2390182
user2390182

Reputation: 73498

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.

Upvotes: 2

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