foobar.py

"""
Provide the definition of a function foo which returns the summation of 
the given three integers when called as follows
"""

# Add function definition here



## Here result should be 12
result = foo(3)(4)(5)

Hint for anyone actually arriving to this page. 
 - Please pay attention to details in programming. 
 - The function is called as foo (3)(4)(5)  and not foo (3,4,5)

Foo (pronounced FOO) is a term used by programmers as a placeholder for a value that can change, depending on conditions or on information passed to the program. Foo and other words like it are formally known as metasyntactic variables.

this function is called not foo(3,4,5)