Python Functions Tutorial, in this tutorial, we will learn Introduction to Function in Python and Type of Functions in Python. Here, You will also learn how to create and call a function in Python which is helpful for any Python developers. Are you looking for the Python functions tutorial with examples or Are you dreaming to become to certified Pro Python Developer, then stop just dreaming, get your Python certification course from India’s Leading Python training institute.
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Introduction to Function in Python
A function is a block of code that only runs when it is called. You can pass inputs that are known as parameters, into a function. A function gives results by returning data or value. The function is created for the reusability of the same code.
Type of Functions in Python
We can find three kinds of functions in python:
Built-in Functions in Python
The First type is built-in functions, such as print() to print the expected value or result, min() to get the minimum value, bool()to get boolean value, etc.
User-Defined Functions in Python
The second type is User Defined Functions( UDF), which are functions created by users.
Anonymous functions in Python
The third type is ‘Anonymous functions’, which are also known as lambda functions. They are not declared with the standard keyword‘def’.
How to create a function in Python
We have to use ‘def’ to declare a function followed by a function's name. Then we have to add parameters to the function within the parentheses of the function. If we don’t write the return statement, the function will return ‘None’.
Ex) deftest():
print("Python")
return
Calling a Function
To call a function, we have to use the function name followed by round brackets (parenthesis):
Syntax:function_name()
Above function be called a test()
Output: Python
Python Function Arguments
Arguments are given to any function call, while the function mentions the arguments by their parameter names. There are four types of arguments for UDFs.
Default arguments
Required arguments
Keyword arguments
Variable number of arguments
Default argument
During the function call these arguments to take a default value if no argument is passed. We can allocate this default value with the assignment operator denoted by ‘=’.
Ex) def multi(x,y = 5):
return x * y
# Callingmulti() with only single parameter
multi(x=1)
Output:
5
# Call multi() with both x and y parameters
multi(x=1, y=3)
Output:
3
Required Arguments
During function call, these arguments need to be passed with the right order exactly, as shown in the following example:
Ex) def multi(x,y):
return x * y
# Calling function Output
multi(12,5)
Output:
60
Keyword Arguments
If we want to check whether all parameters are sequentially or with the right order we use keyword argument. To identify the arguments by parameter names we use these keywords arguments.
Ex) # Defining function
def multi(x,y):
return x * y
# Calling function with parameters
multi(5,10)
Output:
50
# Calling the same function with keyword arguments
plus(x=5, y=10)
output:
50
Variable Number of Arguments:
We can use * args in that case. Let’s see one example.
Ex) # Defining function and try to give more than 2 arguments.
deftest(*args):
for in args:
print(i)
# Displaying the output
test(‘Variable’,’Number’,’type’,’ argument’)
Output:
The variable Number type argument
Anonymous Functions in Python
It can take any number of arguments, but can only have one expression.
Syntax:
lambda arguments: expression
The expression is perform and the result is retain:
Ex) By using the single variable we can use a lambda function
x = lambda b : b + 30
print(x(5))
Output:
35
Ex) Using more than one variable we can use lambda function as:
avg = lambda x,y :(x+y)/2
print(avg(5,7))
Output:
6.0
Why use Lambda Functions?
The benefit of lambda is, we can use it as an anonymous function inside another function.
Ex) deffunc1(a):
return lambda b: b * a
We hope you understand Python functions tutorial with examples, python function arguments and Lambda Function in Python Programming concepts. Get success in your career as a Python developer by being a part of the Prwatech, India's leading Python training institute in Bangalore.
