Develop user defined Python function ,Function with minimum 2 arguments and Function returning values
Functions are the most important aspect of an application. A function can be defined as
the organized block of reusable code which can be called whenever required.
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| Develop user defined Python function ,Function with minimum 2 arguments and Function returning values |
a) Creating a function: In Python, we can use def keyword to define the function.
Syntax:
def my_function():
function-suite
return <expression>
b) Calling a function: To call the function, use the function name followed by the
parentheses.
def hello_world():
print("hello world")
hello_world()
Output:
hello world
c) Arguments in function: The information into the functions can be passed as the
argumenta. The arguments are specified in the parentheses. We can give any number
of arguments, but we have to separate them with a comma.
Example
#defining the function
def func (name):
print("Hi ",name);
#calling the function
func("ABC")
Output:
hi ABC
d) return Statement: The statement return [expression] exits a function, optionally
passing back an expression to the caller. A return statement with no arguments is the
same as return None.
Example
# Function definition is here
def sum( arg1, arg2 ):
# Add both the parameters and return them."
total = arg1 + arg2
print "Inside the function: ", total
return total;
# Now you can call sum function
total = sum(10, 20 );
print "Outside the function: ", total
Output:
Outside the function: 30
Example
1. Write a Python function that takes a number as a parameter and check the number isprime or not.
def prime(num):
if(num==1):
return "no prime"
elif(num==2):
return "This is prime number"
else:
for x in range(2,num):
if(num%x==0):
return "no prime"
return "this is prime number"
print(prime(13))
def factorial(num):
fact = 1
for i in range(num,0,-1):
fact = fact*i
print("factorial is :",fact)
num = int(input("Enter the number :"))
factorial(num)
def upper(str):
num1=0
num2=0
for x in range(len(str)):
if str[x].islower():
num1=num1+1
elif str[x].isupper():
num2 = num2+1
print("number of lowercase character is :",num1)
print("number of uppercase character is :",num2)
str = input("Enter the string :")
upper(str)
