Python Functions
Python Tutorial » Python Functions
A function is a block of code which only runs when it is called.
A function can return data as a result.
Python gives you many built-in functions like print(), etc. but you can also create your own functions. These functions are called user-defined functions.
A function in Python is defined using "def" without quotes:
Example: how to make a function - calling function
Output:
Hello there, this is my first function Python
def my_pyt_function():
print("Hello there, this is my first function Python")
my_pyt_function()
print("Hello there, this is my first function Python")
my_pyt_function()
Output:
Hello there, this is my first function Python
You can call a function using this types of formal arguments:
Keyword arguments,
Required arguments,
Default arguments,
Variable-length arguments
Keyword arguments - example
When you use keyword arguments in a function call, the caller identifies the arguments by the parameter name.
Example:
The older person is Tom
def my_function(person3, person2, person1):
print("The older person is " + person3)
my_function(person1 = "John", person2 = "Chris", person3 = "Tom")
Output: print("The older person is " + person3)
my_function(person1 = "John", person2 = "Chris", person3 = "Tom")
The older person is Tom
Default arguments - example
If we call python function without argument, it will uses default value:
Example:
I am from Milan
I am from Napoli
I am from Marseille
I am from Frankfurt
def my_function(town = "Barcelon"):
print("I am from " + town)
my_function("Milan")
my_function("Napoli")
my_function("Marseille")
my_function("Frankfurt")
Output:print("I am from " + town)
my_function("Milan")
my_function("Napoli")
my_function("Marseille")
my_function("Frankfurt")
I am from Milan
I am from Napoli
I am from Marseille
I am from Frankfurt
Return Values
To make a function to return value, have to use "return" statement without quotes:
Example:
144
48
72
84
def my_function(y):
return 12 * y
print(my_function(12))
print(my_function(4))
print(my_function(6))
print(my_function(7))
Output:return 12 * y
print(my_function(12))
print(my_function(4))
print(my_function(6))
print(my_function(7))
144
48
72
84
python function return, arguments, parameters, as parameters, documentation, declaration, with variable number of parameters, returns 2 values, arguments type, global variable
Python Functions - python
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