Tuesday 5 March 2019

Empty Function in Python

In C/C++ and Java, we can write empty function as following
// An empty function in C/C++/Java

void fun() { }
In Python, if we write something like following in Python, it would produce compiler error.
# Incorrect empty function in Python
def fun():

Output:
IndentationError: expected an indented block
In Python, to write empty functions, we use pass statement. pass is a special statement in Python that does nothing. It only works as a dummy statement.

# Correct way of writing empty function
# in Python
def fun():
pass

We can use pass in empty while statement also.
# Empty loop in Python
mutex = True
while (mutex == True) :
pass

We can use pass in empty if else statements.
# Empty in if/else in Python
mutex = True
if (mutex == True) :
pass
else :
print("False")

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