CODEWITHSUNDEEP
pythonintsettypeerror
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Reputation: 29

Why am I getting a "TypeError: object of type 'int' has no len()" on a set?

I'm getting a TypeError saying that the object of type 'int' has no len() when running a while loop on a set.

import random
l = random.sample(range(100), 20)

s = set()
print(s) 
print(len(s))
while len(s) < 4:
    s = random.choice(l)

I get the right output from the print statements (set() and 0) but the aforementioned TypeError when it reaches the while loop.

Upvotes: 0

Views: 161

Answers (2)

C.Nivs
C.Nivs

Reputation: 13106

You need to add the result to the set, otherwise you are just re-assigning the set to the result of random.choice, which is an int:

while len(s) < 4:
    s.add(random.choice(l))

Upvotes: 1

Anna Nevison
Anna Nevison

Reputation: 2759

That's because your while loop is switching the value to an integer at s = random.choice(l). See:

import random
l = random.sample(range(100), 20)

s = set()
print(s) 
print(len(s))
while len(s) < 4:
    s = random.choice(l)
    print(s)

this returns:

set()
0
50

and then gives you the type error. So you are getting the error because s was originally a set, then it gets switched to int and goes back through the while loop and has no len

Upvotes: 1

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