From 94b6d3246c72eb3cae58a2fd18771e3c2c3e7cb2 Mon Sep 17 00:00:00 2001 From: zhang Date: Sun, 21 Aug 2022 09:41:53 +0800 Subject: copy --- basics/python/default_mutable_parameters.ipynb | 428 +++++++++++++++++++++++++ 1 file changed, 428 insertions(+) create mode 100644 basics/python/default_mutable_parameters.ipynb (limited to 'basics/python') diff --git a/basics/python/default_mutable_parameters.ipynb b/basics/python/default_mutable_parameters.ipynb new file mode 100644 index 0000000..c133f86 --- /dev/null +++ b/basics/python/default_mutable_parameters.ipynb @@ -0,0 +1,428 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## 1. case 1" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:27:26.778739Z", + "start_time": "2022-08-21T01:27:26.765873Z" + } + }, + "outputs": [], + "source": [ + "def add_employee(emp, emp_list = []):\n", + " emp_list.append(emp)\n", + " print(emp_list)" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:27:36.118235Z", + "start_time": "2022-08-21T01:27:36.113245Z" + }, + "scrolled": true + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "['zhang']\n" + ] + } + ], + "source": [ + "add_employee('zhang')" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:27:39.612702Z", + "start_time": "2022-08-21T01:27:39.601724Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "['zhang', 'li']\n" + ] + } + ], + "source": [ + "add_employee('li')" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:28:01.433747Z", + "start_time": "2022-08-21T01:28:01.430249Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "['li']\n" + ] + } + ], + "source": [ + "add_employee('li', [])" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:28:15.988491Z", + "start_time": "2022-08-21T01:28:15.984261Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "['zhang', 'li', 'li']\n" + ] + } + ], + "source": [ + "add_employee('li')" + ] + }, + { + "cell_type": "code", + "execution_count": 12, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:30:02.765148Z", + "start_time": "2022-08-21T01:30:02.744801Z" + } + }, + "outputs": [ + { + "data": { + "text/plain": [ + "(['zhang', 'li', 'li'],)" + ] + }, + "execution_count": 12, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "add_employee.__defaults__" + ] + }, + { + "cell_type": "code", + "execution_count": 13, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:30:44.627317Z", + "start_time": "2022-08-21T01:30:44.623666Z" + } + }, + "outputs": [], + "source": [ + "def add_employee(emp, emp_list = []):\n", + " print(add_employee.__defaults__)\n", + " emp_list.append(emp)\n", + " print(emp_list)\n", + " print(add_employee.__defaults__)" + ] + }, + { + "cell_type": "code", + "execution_count": 14, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:30:46.009755Z", + "start_time": "2022-08-21T01:30:46.002688Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "([],)\n", + "['zhang']\n", + "(['zhang'],)\n" + ] + } + ], + "source": [ + "add_employee('zhang')" + ] + }, + { + "cell_type": "code", + "execution_count": 15, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:31:09.233929Z", + "start_time": "2022-08-21T01:31:09.230161Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "(['zhang'],)\n", + "['zhang', 'li']\n", + "(['zhang', 'li'],)\n" + ] + } + ], + "source": [ + "add_employee('li')" + ] + }, + { + "cell_type": "code", + "execution_count": 16, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:31:45.175683Z", + "start_time": "2022-08-21T01:31:45.172977Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "(['zhang', 'li'],)\n", + "['li']\n", + "(['zhang', 'li'],)\n" + ] + } + ], + "source": [ + "add_employee('li', [])" + ] + }, + { + "cell_type": "code", + "execution_count": 20, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:33:18.260279Z", + "start_time": "2022-08-21T01:33:18.254488Z" + } + }, + "outputs": [], + "source": [ + "def add_employee_fixed(emp, emp_list = None):\n", + " if emp_list is None:\n", + " emp_list = []\n", + " emp_list.append(emp)\n", + " print(emp_list)\n", + " print(add_employee_fixed.__defaults__)" + ] + }, + { + "cell_type": "code", + "execution_count": 21, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:33:31.485064Z", + "start_time": "2022-08-21T01:33:31.481392Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "(None,)\n", + "['zhang']\n", + "(None,)\n" + ] + } + ], + "source": [ + "print(add_employee_fixed.__defaults__)\n", + "add_employee_fixed('zhang')" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## 2. case 2" + ] + }, + { + "cell_type": "code", + "execution_count": 7, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:28:52.580680Z", + "start_time": "2022-08-21T01:28:52.576724Z" + } + }, + "outputs": [], + "source": [ + "from datetime import datetime\n", + "import time" + ] + }, + { + "cell_type": "code", + "execution_count": 22, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:34:32.671514Z", + "start_time": "2022-08-21T01:34:32.668551Z" + } + }, + "outputs": [], + "source": [ + "\n", + "def print_time(time_to_print=datetime.now()):\n", + " print(time_to_print.strftime('%b %d, %Y %H:%M:%S'))" + ] + }, + { + "cell_type": "code", + "execution_count": 23, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:34:48.345468Z", + "start_time": "2022-08-21T01:34:48.341096Z" + } + }, + "outputs": [ + { + "data": { + "text/plain": [ + "(datetime.datetime(2022, 8, 21, 9, 34, 32, 669555),)" + ] + }, + "execution_count": 23, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "print_time.__defaults__" + ] + }, + { + "cell_type": "code", + "execution_count": 25, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:35:35.002020Z", + "start_time": "2022-08-21T01:35:34.998605Z" + } + }, + "outputs": [], + "source": [ + "\n", + "def print_time_fixed(time_to_print=None):\n", + " if time_to_print is None:\n", + " time_to_print = datetime.now()\n", + " print(time_to_print.strftime('%b %d, %Y %H:%M:%S'))" + ] + }, + { + "cell_type": "code", + "execution_count": 26, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:35:39.491909Z", + "start_time": "2022-08-21T01:35:39.488710Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Aug 21, 2022 09:35:39\n" + ] + } + ], + "source": [ + "print_time_fixed()" + ] + }, + { + "cell_type": "code", + "execution_count": 27, + "metadata": { + "ExecuteTime": { + "end_time": "2022-08-21T01:35:43.785204Z", + "start_time": "2022-08-21T01:35:43.782140Z" + } + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Aug 21, 2022 09:35:43\n" + ] + } + ], + "source": [ + "print_time_fixed()" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 3", + "language": "python", + "name": "python3" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 3 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython3", + "version": "3.6.8" + } + }, + "nbformat": 4, + "nbformat_minor": 2 +} -- cgit v1.2.3