How to solve TypeError: 'bool' object is not iterable in Python

Question

This is my function which throws this error

   TypeError: 'bool' object is not iterable

in line:

   if all(v == 0):

My goal is in this line to check whether all values are equal to Zero.

Here is my method:

def main():


  def checklist( thelist ):
    if len(thelist) > 2:
        for v in thelist: 
            if v < 0.0: 
                print ("One negative")
            if all(v == 0):
                print( "All zero")
            else:
                print("All good")  

alist = [0.0, 0.1, 0.3, 0.0]
checklist( alist ) 




if __name__ == '__main__':
 
# Calling main() function
    main()

What I do not understand is what am I actually checking with this line as I'm apparently not checking my list.

Edited code:

  def checklist( thelist ):
    if len(thelist) > 2:
        for v in thelist: 
            if v < 0.0: 
                print ("One negative")
        if all(vs == 0 for vs in thelist):
            print( "All zero")
        else:
            print("All good")  

alist = [0.0, -0.1, 0.3, 0.0]
checklist( alist )

all(vs == 0 for vs in thelist) - but do not put that into the for loop. — luk2302
– luk2302, Commented Jul 8, 2022 at 12:03
You are checking for v, which is an item of the list. So v==0 is a bool. Just drop the for loop. — paime
– paime, Commented Jul 8, 2022 at 12:04
Thank you! @luk2302 It works but I want to reach that I can check both "no value negative" and "at least one not none" before returning the else: So I modified it to the code I have edited in my question but now it prints: "One negativ" and "all good". How can I change it that it only prints "one negative" with the given list? — Wupppa
– Wupppa, Commented Jul 8, 2022 at 12:09
Maybe I did not explicitly mention my goal. I want to print "all good" if and only if all values are not negative AND at least one value is not zero. Many thanks again! — Wupppa
– Wupppa, Commented Jul 8, 2022 at 12:14

Bob · Accepted Answer · 2022-07-08 12:22:35Z

2

The all method expects an iterable.

In your example, v is a float and v == 0 is a boolean. So you're trying to call all for a boolean value, which isn't allowed and leads to the TypeError you're getting.

To check that all values are the 0, you can do it in the following manner:

all(v == 0 for v in alist)

edited Jul 8, 2022 at 12:22

answered Jul 8, 2022 at 12:05

Bob

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Wupppa · Accepted Answer · 2022-07-08 12:22:52Z

1

def main():


  def checklist( thelist ):
    if len(thelist) > 2:
        if all(vs == 0.0 for vs in thelist):
            print( "All zero")
        if any(v < 0.0 for v in thelist): 
            print ("At least one negative")
        else:
            print("All good")  

alist = [-1.0, 1.0, 1.0, 1.0]
checklist( alist )

Solved it! Thanks to @luk2302

edited Jul 8, 2022 at 12:22

answered Jul 8, 2022 at 12:22

Wupppa

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