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‎.ipynb_checkpoints/13. Generators and Decorators-checkpoint.ipynb‎

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@@ -192,13 +192,126 @@
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"```"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### 2. First Class Functions\n",
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"\n",
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" - treating functions like other normal entities\n",
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" - passing function as an argument, assigning to a variable, returning from a 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": 22,
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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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"['Mr Kumar', 'Mrs Sabi']\n"
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]
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}
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],
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"source": [
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"# EXAMPLE\n",
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"\n",
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"def append_prefix(data):\n",
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" if data[0] == 'male':\n",
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" return 'Mr ' + data[1]\n",
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" if data[0] == 'female':\n",
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" return 'Mrs ' + data[1]\n",
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"\n",
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" \n",
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"def map_function(func, my_list):\n",
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" final_output = []\n",
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" for each in my_list:\n",
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" final_output.append(func(each))\n",
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" return final_output\n",
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"\n",
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"output = map_function(append_prefix, [('male', 'Kumar'), ('female', 'Sabi')])\n",
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"print(output)\n",
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" "
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### 3. Closures\n"
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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": 32,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"def greeting(prefix):\n",
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" \n",
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" def append_msg(msg):\n",
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" print ('{0}{1}{2}'.format(prefix,' ', msg))\n",
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" return append_msg ## returning without execution"
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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": 35,
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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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"<function greeting.<locals>.append_msg at 0x7f0c003cd488>\n",
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"append_msg\n",
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"Mr. Kumar\n",
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"Mr. Kabi\n"
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]
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}
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],
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"source": [
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"first = greeting('Mr.')\n",
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"\n",
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"print(first)\n",
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"print(first.__name__)\n",
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"\n",
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"# REMEMBER THE PARAMETER 'Mr.' even after outer function is executed already\n",
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"first('Kumar')\n",
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"first('Kabi')"
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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": 30,
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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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"Mrs. Kumari\n",
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"Mrs. Kabita\n"
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]
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}
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],
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"source": [
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"second = greeting('Mrs.')\n",
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"second('Kumari')\n",
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"second('Kabita')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"collapsed": true
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},
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"source": [
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"### 2. DECORATORS\n",
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"### 4. DECORATORS\n",
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"\n",
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"There may be a scenario to perform any tasks before / after executing a function. This can be achieved through Decorators.\n",
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"\n",
@@ -213,7 +326,80 @@
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### 2.1 EXAMPLE - 1"
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"### Illustration"
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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": 12,
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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 am executed before original function\n",
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"hey I am wrapped by decorator\n"
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]
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}
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],
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"source": [
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"# define a decorator \n",
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"def decorator_func(original_func):\n",
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" def wrapper_func():\n",
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" # without modifying original func, I can add more functionality\n",
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" print (\"I am executed before original function\")\n",
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" return original_func()\n",
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" return wrapper_func\n",
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"\n",
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"# define your working function\n",
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"\n",
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"@decorator_func\n",
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"def my_func():\n",
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" print('hey I am wrapped by decorator')\n",
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"\n",
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" \n",
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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": 17,
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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 am executed before original function\n",
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"hey I am wrapped by decorator\n"
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]
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}
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],
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"source": [
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"# define a decorator \n",
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"def decorator_func(original_func):\n",
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" def wrapper_func(*args, **kwargs):\n",
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" # without modifying original func, I can add more functionality\n",
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" print (\"I am executed before original function\")\n",
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" return original_func(*args, **kwargs)\n",
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" return wrapper_func\n",
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"\n",
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"# define your working function\n",
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"\n",
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"@decorator_func\n",
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"def my_func_para(param1, param2):\n",
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" print('hey I am wrapped by decorator')\n",
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"\n",
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" \n",
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"my_func_para('hey', 'buddy')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### EXAMPLE - 1"
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]
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},
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{
@@ -374,7 +560,7 @@
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"collapsed": true
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},
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"source": [
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"### EXAMPLE - 1"
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"### EXAMPLE - 2"
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]
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},
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{
@@ -438,25 +624,32 @@
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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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"execution_count": 18,
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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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"inside italic wrapped\n",
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"inside bold hello\n",
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"<i><b>Hello World</b></i>\n"
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]
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}
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],
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"source": [
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"def makebold(fn):\n",
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" print('makebold called')\n",
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" def wrapped():\n",
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" print('inside bold', fn.__name__)\n",
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" \n",
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" return \"<b>%s</b>\" % fn()\n",
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" return wrapped\n",
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"\n",
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"def makeitalic(fn):\n",
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" def cover():\n",
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" print('inside italic', fn.__name__)\n",
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" \n",
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" return \"<i>%s</i>\" %fn()\n",
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" return cover\n",
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"\n",
@@ -499,46 +692,13 @@
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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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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"third one\n",
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"second one\n",
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"first one\n",
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"Hello, world!\n",
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"Hello, solar system!\n",
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"Hello, galaxy!\n"
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]
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}
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],
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"def testtime(original_function):\n",
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" def new_function():\n",
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" print('second one')\n",
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" #original_function() # the () after \"original_function\" causes original_function to be called\n",
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" print(\"Hello, solar system!\")\n",
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" return new_function\n",
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" \n",
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"def testlog(original_function):\n",
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" def new_function():\n",
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" print('third one')\n",
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" #original_function() # the parentheses after \"original_function\" cause original_function to be called\n",
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" print(\"Hello, galaxy!\")\n",
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" return new_function\n",
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" \n",
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"\n",
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"@testlog\n",
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"@testtime\n",
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"def call_me():\n",
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" print('first one')\n",
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" print (\"Hello, world!\")\n",
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" \n",
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"# Here is where we actually *do* something!\n",
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"call_me()"
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"def counter()"
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]
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},
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{

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