TypeError: ‘bool’ object is not callable in Python (Fixed)
The “TypeError: ‘bool’ object is not callable” error occurs when you try to call a boolean value (
bool object) as if it was a function!
Here’s what the error looks like:
Traceback (most recent call last): File /dwd/sandbox/test.py, line 3, in <module> if is_active() == true: ^^^^^^^^^^^ TypeError: 'bool' object is not callable
In the simplest terms, this is what happens:
is_active = True # ⚠️ is_active is a boolean value not a callable if is_active() == True: print('User is active.')
Calling a boolean value like a callable isn't what you'd do on purpose, though. It usually happens due to unwanted value assignments. Or accidentally overriding a function's global name with
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To fix the issue, trace the error back up to the statement that changed your function to a boolean value.
Additionally, if you accidentally put an extra parenthesis after a built-in or user-defined function that returns a boolean value, you'll get the error:
# 🚫 Raises TypeError: 'bool' object is not callable bool()()
In the above example,
False, and having an extra pair of parenthesis is like
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How to fix TypeError: 'bool' object is not callable?
First, inspect the respective function's value, and figure out how it ended up being a boolean object in the first place.
Sometimes figuring this out might be tricky. Below are three scenarios that lead to the "TypeError: 'bool' object is not callable" error:
- Declaring variable with a name that's also the name of a function
- Calling a method that's also the name of a property
- Calling a method decorated with
Let's explore each scenario with some examples.
1. Declaring a variable with a name that's also the name of a function: A Python function is an object like any other built-in object, such as int, float, dict, list, etc.
All built-in functions are defined in the builtins module and assigned a global name for easier access. For instance,
That said, overriding a function (accidentally or on purpose) with another value is technically possible.
For instance, if you define a variable named
str and initialize it with a boolean value, it'll no longer point to the
# ⚠️ the value of the built-in function str() is changed to True str = True score = 15 # 🚫 Raises TypeError: 'bool' object is not callable - str is no longer a function print ('The score is: ' + str(score))
If you run the above code, Python will complain with a "TypeError: 'bool' object is not callable" error because
True (the new value of
str) isn't callable.
You have two ways to fix the issue:
- Rename the variable
- Explicitly access the
strfunction from the builtins module (
The second approach isn't recommended unless you're developing a module. For instance, if you want to implement an
open() function that wraps the built-in
# Custom open() function using the built-in open() internally def open(filename): # ... __builtins__.open(filename, 'w', opener=opener) # ...
In almost every other case, you should always avoid naming your variables as existing functions and methods. But if you've done so, renaming the variable would solve the issue.
So the above example could be fixed like this:
status = True score = 15 print ('The score is: ' + str(score)) # Output: The score is: 15
Overriding functions (and calling them later on) is one of the most common causes of the "TypeError: 'bool' object is not callable" error. It's similar to calling integer numbers.
Now, let's get to the less common mistakes that lead to this error.
2. Calling a method that's also the name of a property: When you define a property in a class constructor, it'll shadow any other attribute of the same name.
class Book: def __init__(self, title, published): self.title = title self.published = published def published(self): return self.published book = Book('Learning Python', True) # 🚫 Raises TypeError: 'bool' object is not callable if book.published(): print('The book is published.')
In the above code, class
Book contains a property named
published that defines whether the books is published or not. Further down, we defined a method, also named
As a result, any reference to
published returns the property not the method. And if you try to call this property, you should expect the "TypeError: ‘bool’ object is not callable" error.
The method name
is_published sounds like a safer and more readable alternative:
class Book: def __init__(self, title, published): self.title = title self.published = published def is_published(self): return self.published book = Book('Learning Python', True) if book.is_published(): print('The book is published.') # Output: The book is published.
3. Calling a method decorated with
@property decorator: The
@property decorator turns a method into a “getter” for a read-only attribute of the same name.
class User: def __init__(self, user_id, active): self._user_id = user_id self._active = active @property def active(self): return self._active user = User(1, True) # 🚫 Raises TypeError: 'bool' object is not callable if user.active(): print('User is active!')
You need to access the getter method without the parentheses:
class User: def __init__(self, user_id, active): self._user_id = user_id self._active = active @property def active(self): return self._active user = User(1, True) if user.active: print('User is active!') # Output: User is active!
Alright, I think it does it! I hope this quick guide helped you fix your problem.
Thanks for reading.
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