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Udemy codealong tutorial
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‎Python Decorators..ipynb

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"def hello():\n",
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" print ('Hello!')\n",
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"\n",
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"greet = hello"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"<function __main__.hello()>"
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]
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},
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"execution_count": 2,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"greet"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hello!\n"
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]
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}
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],
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"source": [
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"greet()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [],
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"source": [
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"def hello(name):\n",
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" print ('Hey this is the hello parent function!!')\n",
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" \n",
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" def greet():\n",
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" return '\\t Hey this is the greet function inside Hello func!!'\n",
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" def welcome():\n",
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" return '\\t Hey this is the welcome function inside Hello func!!'\n",
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" \n",
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" if name=='Jit':\n",
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" return greet\n",
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" else:\n",
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" return welcome"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hey this is the hello parent function!!\n"
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]
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}
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],
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"source": [
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"my_func= hello('Jit')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"<function __main__.hello.<locals>.greet()>"
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]
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},
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"execution_count": 6,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"my_func"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'\\t Hey this is the greet function inside Hello func!!'"
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]
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},
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"execution_count": 7,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"my_func()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [],
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"source": [
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"#Decorator Creation"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [],
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"source": [
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"def func_needs_decoration():\n",
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" print('I need to be decorated!!')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [],
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"source": [
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"def new_decorator(pass_func_that_needs_decoration):\n",
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" \n",
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" def wrap_func():\n",
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" print('Some code that will come before original!')\n",
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" pass_func_that_needs_decoration()\n",
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" print('Some code that will come after original!')\n",
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" return wrap_func"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 20,
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"metadata": {},
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"outputs": [],
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"source": [
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"my_new_func= func_needs_decoration\n",
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"decorated_func= new_decorator(my_new_func)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 21,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"I need to be decorated!!\n"
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]
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}
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],
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"source": [
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"my_new_func()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 22,
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"metadata": {},
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"outputs": [],
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"source": [
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"decorated_func= new_decorator(func_needs_decoration) "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Some code that will come before original!\n",
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"I need to be decorated!!\n",
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"Some code that will come after original!\n"
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]
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}
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],
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"source": [
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"decorated_func()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 29,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Some code that will come before original!\n",
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"I need to be decorated!!\n",
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"Some code that will come after original!\n"
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]
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}
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],
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"source": [
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"deco= new_decorator(my_new_func)\n",
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"deco()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"#Syntax on how to add new decorator to existing function."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 27,
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"metadata": {},
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"outputs": [],
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"source": [
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"@new_decorator\n",
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"def func_needs_decoration(): \n",
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" print('I need to be decorated!!')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 28,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Some code that will come before original!\n",
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"I need to be decorated!!\n",
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"Some code that will come after original!\n"
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]
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}
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],
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"source": [
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"func_needs_decoration()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}

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