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Python 3 reference · Built-in Functions

Python hasattr() Function

Return True if an object has an attribute with the given name. It works by calling getattr() and catching AttributeError.

Python 3 Since 3.0

Syntax

hasattr(object, name)

Parameters

ParameterDescription
object Any object.
name The attribute name as a string.

Return value

True or False.

Examples

Check for a methodTry it yourself
print(hasattr("text", "upper"))
print(hasattr([1, 2], "upper"))

Output

True
False
Duck typingTry it yourself
class Duck:
    def quack(self): return "Quack!"

class Robot:
    pass

for thing in [Duck(), Robot()]:
    print(thing.quack() if hasattr(thing, "quack") else "can't quack")

Output

Quack!
can't quack

Version history

VersionChange
Python 3.0Added
  • getattr() · Get an attribute by name, given as a string. An optional default is returned instead of raising AttributeError.
  • setattr() · Set an attribute on an object by name, given as a string. setattr(obj, 'x', 5) is the same as obj.x = 5.
  • delattr() · Delete a named attribute from an object. delattr(obj, 'name') does the same as del obj.name when the name is in a variable.
  • callable() · Return True if an object can be called like a function: functions, classes, methods and objects with __call__().
  • Python Classes and Objects · tutorial