Almost everything in Python is an object, similarly function is an object too and all the function objects have a __closure__ attribute. __closure__ is a dunder/magic function i.e. methods having two underscores as prefix and suffix in the method name
A closure is a function object that remembers values in enclosing scopes even if they are not present in memory. The __closure__ attribute of a closure function returns a tuple of cell objects. This cell object also has an attribute called cell_contents, which returns returns the contents of the cell.
Syntax:
closure_function.__closure__
Example:
Python
# this is a nested function def gfg(raise_power_to): def power(number): return number * * raise_power_to return power raise_power_to_3 = gfg( 3 ) print (raise_power_to_3.__closure__) print (raise_power_to_3.__closure__[ 0 ].cell_contents) |
Output:
(<cell at 0x7f34ba2725e0: int object at 0x7f34bde02720>,)
3
In the above example, the nested function power has __closure__ attribute associated with it and it returns a tuple of cell objects. The cell_contents attribute returns the value 3 as it was closed inside the cell object.
Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.