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Positional Arguments
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‎Positional Arguments.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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"id": "11e148a4",
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"metadata": {},
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"outputs": [],
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"source": [
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"def my_func(a, b, c):\n",
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" print(\"a={0}, b={1}, c={2}\".format(a, b, c))"
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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": "458fc390",
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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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"a=1, b=2, c=3\n"
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]
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}
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],
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"source": [
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"my_func(1, 2, 3)"
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]
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},
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{
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"cell_type": "markdown",
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"id": "23f4ea96",
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"metadata": {},
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"source": [
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"## Default Values"
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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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"id": "46851f02",
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"metadata": {},
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"outputs": [],
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"source": [
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"def my_func(a, b=2, c=3):\n",
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" print(\"a={0}, b={1}, c={2}\".format(a, b, c))"
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]
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},
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{
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"cell_type": "markdown",
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"id": "1cad99af",
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"metadata": {},
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"source": [
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"Note that once a parameter is assigned a default value, all parameters thereafter must be asigned a default value too!\n",
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"\n",
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"For example, this will not work:"
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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": "f51f9f59",
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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": "non-default argument follows default argument (3755199277.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[4], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m def fn(a, b=2, c):\u001b[0m\n\u001b[1;37m ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m non-default argument follows default argument\n"
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]
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}
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],
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"source": [
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"def fn(a, b=2, c):\n",
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" print(a, b, c)"
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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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"id": "4e2043b6",
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"metadata": {},
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"outputs": [],
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"source": [
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"def my_func(a, b=2, c=3):\n",
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" print(\"a={0}, b={1}, c={2}\".format(a, b, c))"
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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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"id": "1d893fd0",
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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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"a=10, b=20, c=30\n"
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]
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}
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],
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"source": [
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"my_func(10, 20, 30)"
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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": "13848ec1",
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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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"a=10, b=20, c=3\n"
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]
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}
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],
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"source": [
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"my_func(10, 20)"
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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": "c6552429",
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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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"a=10, b=2, c=3\n"
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]
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}
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],
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"source": [
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"my_func(10)"
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]
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},
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{
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"cell_type": "markdown",
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"id": "a1f916de",
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"metadata": {},
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"source": [
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"Since a does not have a default value, it must be specified:"
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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": "7248f6fd",
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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": "my_func() missing 1 required positional argument: 'a'",
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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[9], line 1\u001b[0m\n\u001b[1;32m----> 1\u001b[0m \u001b[43mmy_func\u001b[49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m\n",
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"\u001b[1;31mTypeError\u001b[0m: my_func() missing 1 required positional argument: 'a'"
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]
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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": "markdown",
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"id": "066893e5",
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"metadata": {},
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"source": [
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"Keyword Arguments (named arguments)\n",
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"Positional arguments, can optionally, be specified using their corresponding parameter name.\n",
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"\n",
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"This allows us to pass the arguments without using the positional assignment:"
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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": "ad1808f7",
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"metadata": {},
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"outputs": [],
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"source": [
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"def my_func(a, b=2, c=3):\n",
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" print(\"a={0}, b={1}, c={2}\".format(a, b, c))"
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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": "343a48fb",
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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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"a=10, b=20, c=30\n"
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]
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}
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],
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"source": [
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"my_func(c=30, b=20, a=10)"
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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": "7f75e039",
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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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"a=10, b=20, c=30\n"
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]
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}
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],
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"source": [
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"my_func(10, c=30, b=20)"
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]
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},
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{
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"cell_type": "markdown",
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"id": "d24417f8",
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"metadata": {},
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"source": [
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"Note that once a keyword argument has been used, all arguments thereafter must also be named:"
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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": 14,
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"id": "103530c8",
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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": "positional argument follows keyword argument (3343971405.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[14], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m my_func(10, b=20, 30)\u001b[0m\n\u001b[1;37m ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m positional argument follows keyword argument\n"
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]
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}
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],
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"source": [
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"my_func(10, b=20, 30)"
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]
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},
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{
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"cell_type": "markdown",
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"id": "620e8932",
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"metadata": {},
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"source": [
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"However, if a parameter has a default value, it can be omitted from the argument list, named or not:"
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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": 15,
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"id": "1487d510",
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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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"a=10, b=2, c=30\n"
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]
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}
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],
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"source": [
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"my_func(10, c=30)"
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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": 16,
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"id": "9c9a93e1",
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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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"a=30, b=2, c=10\n"
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]
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}
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],
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"source": [
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"my_func(a=30, c=10)"
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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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"id": "948f2f97",
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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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"a=30, b=2, c=10\n"
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]
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}
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],
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"source": [
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"my_func(c=10, a=30)"
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]
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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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