callable() Is object callable
Last updated: 2026-09-22
callable() Is object callable
callable() returns True if the object appears callable (function, class, or object with __call__).
| Category | Built-in Functions |
|---|---|
| Kind | Built-in Function |
| Python Version | all |
📝 Syntax
callable(object)⚙️ Parameters
| object Required | Any object. |
|---|
Returns：bool. Whether the object is callable (function, class, or object with __call__).
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
True
False
True💡 Related Cases
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❓ FAQ
QWhich objects make callable() return True?
AFunctions (including lambdas), classes (calling one instantiates it), and object instances that define a __call__ method.
QWhat does callable(42) return?
AIt returns False — integers are not callable; likewise strings and lists are not callable.
QWhat is callable() useful for?
AIt provides a safety check before dynamic invocation to avoid the 'object is not callable' TypeError — common in callbacks, registries, and command dispatching.
QIf callable() returns True, does that guarantee invocation succeeds?
ANot necessarily. callable() only checks whether something can be called; the call can still raise a TypeError, for example if arguments do not match the signature.
