{"id":6311,"date":"2023-01-02T04:47:40","date_gmt":"2023-01-02T04:47:40","guid":{"rendered":"https:\/\/studysection.com\/blog\/?p=6311"},"modified":"2023-01-03T10:08:29","modified_gmt":"2023-01-03T10:08:29","slug":"explain-this-pattern-with-an-example-in-python-decorators","status":"publish","type":"post","link":"https:\/\/studysection.com\/blog\/explain-this-pattern-with-an-example-in-python-decorators\/","title":{"rendered":"Explain this pattern with an example in Python – Decorators"},"content":{"rendered":"

In general, each variable has its scope. The global variable is declared outside of the main program block and used by any function as a free variable and the Local variable is declared within the function and bound to its local scope.
\nAs python works with object.Functions are also treated as objects in python. So, many variables can be bound with the same object.<\/p>\n

Example:<\/strong>
\ndef my_programme(msg):
\nprint(msg)
\nmy_programme(\"Hello Webner\")
\nnew_progamme = my_programme
\nnew_progamme (\"Hello Webner\")<\/code><\/p>\n

Output:<\/h3>\n

Hello Webner
\nHello Webner<\/em><\/p>\n

Explanation:<\/strong>
\nBoth my_programme and new_progamme refer to the same object. In general, a function can take other functions as arguments or return another function.<\/p>\n

Decorators:<\/strong>
\nDecorators<\/a> behave as a wrapper. It takes in a function, adds the functionality, and returns it.<\/p>\n

Purpose:<\/strong> to enhance the functionality of code
\nWorking:<\/strong> modify code at compile time.<\/p>\n

Example:<\/h3>\n

def my_programme(func):
\ndef new_progamme ():
\nprint(\"Decorate the function\")
\nfunc()
\nreturn new_progamme
\ndef without_decorate():
\nprint(\"not decorated\")
\ndecorate = make_decorate(without_decorate)
\ndecorate()<\/code><\/p>\n

Output:<\/h3>\n

Decorate the function
\nnot decorated<\/em><\/p>\n

Explanation:<\/strong> In the above program, make_decorate is a decorator which decorates the without_decorate() function.
\nPython simplifies this concept using the syntax ‘ @’ with the decorator function which is placed above the function definition to be decorated.
\n@make_decorate
\ndef without_decorate():
\nprint(\"not decorated\")
\nwhich is equivalent to :
\ndef without_decorate():
\nprint(\"not decorated\")
\ndecorate = make_decorate(without_decorate)<\/code><\/p>\n

Benefits:<\/h3>\n