Where do we use Function? and why do we use it?
INTRODUCTION:
generally, when we have to write huge lines of code we get confused
sometimes we’ve to repeat a code for the same process So instead of writing all the code again and again we can use functions that once declared can be used anywhere in the code
Reusability of code is the main advantage of using functions
Syntax
def function_name(parameters):
"our code"
statement(s)
here def is a keyword that shows the function header
function_name is a uniquely named identifier
parameters by which we will pass values for the function they are optional
colon : is the end of the function header
then we’ve to write our code which should be intended for 4 spaces or 1 tab
we can use a return statement if we need any values from the functions
Example:
def welcome (name):
print("Hello, " + name + ". how are you!")
welcome('Everyone')
Output
Hello, Everyone. how are you!
Return Statement:
It is used to get the value evaluated from the code of the function
if there is no expression inside the statement then the return statement itself will not be present then it will return none object
Example for return:
def value(num):
if num >= 0:
return num
else:
return -num
print(value(9))
print(value(-8))
Output:
9 8
Example with more parameters:
def my_function(OS):
for x in OS:
print(x)
Fav= ["Mac", "Android", "Linux"]
my_function(Fav)
we can send any kind of data type of argument to a function like string, number, list, dictionary, etc.), and it will be treated as the same data type inside that function.
for example. if you send a list as an argument, it will still be a List when it reaches the function:
Output:
Mac Android Linux
Types of functions:
- Builtin functions
- User defined functions click here to know more
