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function args and kwargs
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‎function_args_kwargs.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"id": "7934a87e",
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"metadata": {},
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"source": [
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"# args & kwargs\n",
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"## *args\n",
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"When we are not sure about the number of arguments being passed to a function then we can\n",
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"use *args as function parameter.\n",
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"*args allow us to pass the variable number of Non Keyword Arguments to function.\n",
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"We can simply use an asterisk * before the parameter name to pass variable length\n",
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"arguments.\n",
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"The arguments are always passed as a tuple.\n",
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"We can rename it to anything as long as it is preceded by a single asterisk (*). It's best\n",
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"practice to keep naming it args to make it immediately recognizable.\n",
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"## **kwargs\n",
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"**kwargs allows us to pass the variable number of Keyword Arguments to the function.\n",
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"We can simply use an double asterisk ** before the parameter name to pass variable length\n",
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"arguments.\n",
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"The arguments are passed as a dictionary.\n",
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"We can rename it to anything as long as it is preceded by a double asterisk (**). It's best\n",
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"practice to keep naming it kwargs to make it immediately recognizable"
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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": 1,
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"id": "c8abaf21",
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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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"60\n"
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]
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}
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],
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"source": [
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"def add(a,b,c):\n",
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" return a+b+c\n",
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" \n",
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"print(add(10,20,30)) # Sum of two numbers"
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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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"id": "2161cf58",
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"metadata": {},
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"outputs": [
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{
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"ename": "TypeError",
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"evalue": "add() takes 3 positional arguments but 4 were given",
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"output_type": "error",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)",
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"Cell \u001b[1;32mIn[2], line 1\u001b[0m\n\u001b[1;32m----> 1\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[43madd\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;241;43m1\u001b[39;49m\u001b[43m,\u001b[49m\u001b[38;5;241;43m2\u001b[39;49m\u001b[43m,\u001b[49m\u001b[38;5;241;43m3\u001b[39;49m\u001b[43m,\u001b[49m\u001b[38;5;241;43m4\u001b[39;49m\u001b[43m)\u001b[49m) \n\u001b[0;32m 2\u001b[0m \u001b[38;5;124;03m'''This will throw below error as this function will only take\u001b[39;00m\n\u001b[0;32m 3\u001b[0m \u001b[38;5;124;03mIf we want to make argument list dynamic then *args wil come in picture'''\u001b[39;00m\n",
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"\u001b[1;31mTypeError\u001b[0m: add() takes 3 positional arguments but 4 were given"
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]
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}
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],
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"source": [
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"print(add(1,2,3,4)) \n",
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"'''This will throw below error as this function will only take\n",
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"If we want to make argument list dynamic then *args wil come in picture'''"
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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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"id": "810bc714",
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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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"arg_1: 1\n",
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"arg_2: 2\n",
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"arg_3: 3\n"
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]
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}
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],
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"source": [
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"def some_args(arg_1, arg_2, arg_3):\n",
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" print(\"arg_1:\", arg_1)\n",
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" print(\"arg_2:\", arg_2)\n",
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" print(\"arg_3:\", arg_3)\n",
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"\n",
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"my_list = [2, 3]\n",
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"some_args(1, *my_list)"
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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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"id": "2570a490",
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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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"6\n",
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"10\n",
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"15\n",
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"21\n",
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"28\n"
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]
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}
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],
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"source": [
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"def add1(*args):\n",
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" return sum(args)\n",
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"print(add1(1,2,3))\n",
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"print(add1(1,2,3,4)) # *args will take dynamic argument list.\n",
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"print(add1(1,2,3,4,5))\n",
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"print(add1(1,2,3,4,5,6))\n",
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"print(add1(1,2,3,4,5,6,7))"
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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": 8,
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"id": "f252e4d4",
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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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"(28, 28)"
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]
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},
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"execution_count": 8,
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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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"list1 = [1,2,3,4,5,6,7]\n",
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"tuple1 = (1,2,3,4,5,6,7)\n",
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"add1(*list1) , add1(*tuple1) #tuple & list items will be passed as argument list"
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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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"id": "7c35418f",
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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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"112"
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]
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},
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"execution_count": 9,
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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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"list1 = [1,2,3,4,5,6,7]\n",
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"list2 = [1,2,3,4,5,6,7]\n",
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"list3 = [1,2,3,4,5,6,7]\n",
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"list4 = [1,2,3,4,5,6,7]\n",
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"add1(*list1 , *list2 , *list3 , *list4 )"
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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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"id": "64728bc9",
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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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"('Sunil', 9421, 416311, 39, 'India', 'Maharashtra', 'Marathi')\n"
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]
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},
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{
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"data": {
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"text/plain": [
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"' For the above example we have no idea about the parameters passed e.g 9421 , \\n In such cases we can take help of Keyworded arguments (**kwargs) '"
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]
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},
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"execution_count": 10,
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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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"def UserDetails(*args):\n",
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" print(args)\n",
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"UserDetails('Sunil' , 9421 , 416311 , 39 , 'India' , 'Maharashtra', 'Marathi')\n",
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"''' For the above example we have no idea about the parameters passed e.g 9421 , \n",
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" In such cases we can take help of Keyworded arguments (**kwargs) '''"
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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": 11,
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"id": "ea95f11f",
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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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"Name :- Sunil\n",
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"ID :- 9421\n",
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"Pincode :- 416311\n",
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"Age :- 39\n",
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"Country :- India\n",
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"State :- Maharashtra\n",
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"Language :- Marathi\n"
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]
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}
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],
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"source": [
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"def UserDetails(**kwargs):\n",
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" for key,val in kwargs.items():\n",
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" print(\"{} :- {}\".format(key,val))\n",
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"UserDetails(Name='Sunil' , ID=9421 , Pincode=416311 , Age= 39 , \n",
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" Country= 'India', State='Maharashtra',Language='Marathi')"
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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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"id": "a75a3496",
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"metadata": {},
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"outputs": [],
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"source": [
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"mydict = {'Name': 'Sunil', 'ID': 9970, 'Pincode': 412213, 'Age': 40, \n",
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" 'Country': 'India', 'State' :'Maharashtra','Language':'Marathi'}"
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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": 13,
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"id": "b7cc3f83",
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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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"Name :- Sunil\n",
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"ID :- 9970\n",
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"Pincode :- 412213\n",
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"Age :- 40\n",
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"Country :- India\n",
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"State :- Maharashtra\n",
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"Language :- Marathi\n"
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]
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}
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],
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"source": [
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"UserDetails(**mydict)"
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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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"id": "0dfcd883",
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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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"License No :- MH-10\n",
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"Full Name :- Sunil Zambare Dongarsoni\n",
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"Phone Number:- 12345678910\n",
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"Name :- Sunil\n",
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"ID :- 9970\n",
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"Pincode :- 416311\n",
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"Age :- 40\n",
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"Village :- Ayodhyanagar\n",
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"State :- Maharashtra\n",
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"Country :- India\n"
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]
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}
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],
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"source": [
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"def UserDetails(licenseNo, *args , phoneNo=0 , **kwargs): # Using all four argum\n",
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" print('License No :- ', licenseNo)\n",
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" j=''\n",
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" for i in args:\n",
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" j = j+i\n",
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" print('Full Name :-',j)\n",
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" print('Phone Number:- ',phoneNo)\n",
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" for key,val in kwargs.items():\n",
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" print(\"{} :- {}\".format(key,val))\n",
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"\n",
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"name = ['Sunil' , ' ' , 'Zambare' , ' ','Dongarsoni']\n",
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"mydict = {'Name': 'Sunil', 'ID': 9970, 'Pincode': 416311, 'Age': 40, \n",
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" 'Village' :'Ayodhyanagar','State' :'Maharashtra', 'Country': 'India'}\n",
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"UserDetails('MH-10' , *name , phoneNo=12345678910,**mydict )"
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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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"id": "8d58bd2e",
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"metadata": {},
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"outputs": [],
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"source": [
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"def UserDetails(licenseNo, *args , phoneNo=0, **kwargs): # Using all four arguments\n",
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" print('Nothing')"
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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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"id": "2e7734e4",
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"metadata": {},
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"outputs": [
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{
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"ename": "SyntaxError",
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"evalue": "invalid syntax (3335583366.py, line 1)",
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"output_type": "error",
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"traceback": [
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"\u001b[1;36m Cell \u001b[1;32mIn[22], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m def UserDetails(licenseNo, **kwargs , *args): # This will fail.\u001b[0m\n\u001b[1;37m ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
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]
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}
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],
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"source": [
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"def UserDetails(licenseNo, **kwargs , *args): # This will fail.\n",
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" print('Nothing')"
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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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"id": "03b621a6",
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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 (ipykernel)",
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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": "3.9.12"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}

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