Functions in python
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Functions in python
Transcript of Functions in python
Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
FUNCTIONS IN PYTHON
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What is a Function?
A function is a block of code that has a name and it has a property that it is reusable
i.e. it can be executed from as many different points in Program as required
Structure of a Function
There are two main parts of the function. i.e:The function header and the function body.
int sum(int x,int y){Int a=0;a=x+y;return a}
Function Header:
{Int a=0;a=x+y;return a}
It has three main partsThe name of the function i.e. sumThe parameters of the function enclosed in paranthesisReturn value type Eg:int sum(int x,int y)
Function Body:What ever is written with in { } in the above example is the body of the function.
Function Call:Function is called by function namei.e:Here,for eg: sum(1,2);
FUNCTION IN PYTHON:
Defining a Function
Function blocks begin with the keyword def followed by the function name and parentheses ( ( ) ).
Any input parameters or arguments should be placed within these parentheses. You can also define parameters inside these parentheses.
The first statement of a function can be an optional statement - the documentation string of the function or docstring.
The code block within every function starts with a colon (:) and is indented.
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.
Syntax:
def functionname( parameters ): "function_docstring" function_suite return [expression] def functionname( parameters ): "function_docstring" function_suite return [expression]
def functionname (parameters): “function docstring” function_suite return [expression]
def functionname( parameters ):
By default, parameters have a positional behavior, and you need to inform them in the same order that they were defined.
Example:
def printme(str): “this prints the passed strings into this function” print str return
Calling a Function:we can execute it by calling it from another function or directly from the Python promptFor above example,function can be called as printme(“hai friends!”) output: hai friends!
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