Developing Functions¶
Let us understand how to develop functions using Python as programming language.
Function starts with
deffollowed by function name.Parameters can be of different types.
Required
Keyword
Variable Number
Functions
Functions which take another function as an argument is called higher order functions.
Tasks¶
Let us perform few tasks to understand how to develop functions in Python.
Sum of integers between lower bound and upper bound using formula.
def sumOfN(n):
return int((n * (n + 1)) / 2)
sumOfN(10)
55
def sumOfIntegers(lb, ub):
return sumOfN(ub) - sumOfN(lb -1)
sumOfIntegers(5, 10)
45
Sum of integers between lower bound and upper bound using loops.
def sumOfIntegers(lb, ub):
total = 0
for e in range(lb, ub + 1):
total += e
return total
sumOfIntegers(1, 10)
55
sumOfIntegers(5, 10)
45
Sum of squares of integers between lower bound and upper bound using loops.
def sumOfSquares(lb, ub):
total = lb * lb
for e in range(lb + 1, ub + 1):
total += e * e
return total
sumOfSquares(2, 4)
29
Sum of the even numbers between lower bound and upper bound using loops.
def sumOfEvens(lb, ub):
total = lb if lb % 2 == 0 else 0
for e in range(lb + 1, ub + 1):
total += e if e%2==0 else 0
return total
sumOfEvens(2, 4)
6