Python def keyword is used to define a function, it is placed before a function name that is provided by the user to create a user-defined function. In python, a function is a logical unit of code containing a sequence of statements indented under a ... # Python3 code to demonstrate # def keyword # function for subtraction of 2 numbers def subNumbers(x, y): return (x-y) # main code a = 90 b = 50 # finding subtraction result = subNumbers(a, b) # print statement print("subtraction of ", a, "