Python 开发记事本

本文主要是介绍Python 开发记事本，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

Python 开发记事本

文章目录

Python 开发记事本
- 一、案例介绍
- 二、示例效果
- 三、代码实现
- - 3.1 导入库文件
  - 3.2 设定功能
  - 3.3 功能实现
  - 3.4 绘制界面
  - 3.5 设定快捷键
- 四、总结

一、案例介绍

基于 python 的tkinter 库实现界面的绘制

tkinter是Python下面向tk的图形界面接口库，可以方便地进行图形界面设计和交互操作编程。tkinter的优点是简单易用、与Python的结合度好。tkinter在Python 3.x下默认集成，不需要额外的安装操作；不足之处为缺少合适的可视化界面设计工具，需要通过代码来完成窗口设计和元素布局。

本例采用的Python版本为3.x，如果想在python 2.x下使用tkinter，请通过apt-get进行安装。需要注意的是，不同Python版本下的tkinter使用方式可能略有不同，建议采用Python 3。

二、示例效果

实现基础记事本的文字输入、记录、保存。对于输入过程中的一些文件编辑设定功能。

三、代码实现

3.1 导入库文件

根据本次开发需要导入需要的库文件

from tkinter import *
from tkinter.filedialog import *
from tkinter.messagebox import *
import os

3.2 设定功能

def author():showinfo(title="作者", message="Python")def power():showinfo(title="版权信息", message="课堂练习")def mynew():global top, filename, textPadtop.title("未命名文件")filename = NonetextPad.delete(1.0, END)def myopen():global filenamefilename = askopenfilename(defaultextension=".txt")if filename == "":filename = Noneelse:top.title("记事本"+os.path.basename(filename))textPad.delete(1.0, END)f = open(filename, 'r')textPad.insert(1.0, f.read())f.close()def mysave():global filenametry:f = open(filename, 'w')msg = textPad.get(1.0, 'end')f.write(msg)f.close()except:mysaveas()def mysaveas():global filenamef = asksaveasfilename(initialfile="未命名.txt", defaultextension=".txt")filename = ffh = open(f, 'w')msg = textPad.get(1.0, END)fh.write(msg)fh.close()top.title("记事本 "+os.path.basename(f))def cut():global textPadtextPad.event_generate("<<Cut>>")def copy():global textPadtextPad.event_generate("<<Copy>>")def paste():global textPadtextPad.event_generate("<<Paste>>")def undo():global textPadtextPad.event_generate("<<Undo>>")def redo():global textPadtextPad.event_generate("<<Redo>>")def select_all():global textPad# textPad.event_generate("<<Cut>>")textPad.tag_add("sel", "1.0", "end")def find():t = Toplevel(top)t.title("查找")t.geometry("260x60+200+250")t.transient(top)Label(t, text="查找：").grid(row=0, column=0, sticky="e")v = StringVar()e = Entry(t, width=20, textvariable=v)e.grid(row=0, column=1, padx=2, pady=2, sticky="we")e.focus_set()c = IntVar()Checkbutton(t, text="不区分大小写", variable=c).grid(row=1, column=1, sticky='e')Button(t, text="查找所有", command=lambda: search(v.get(), c.get(),textPad, t, e)).grid(row=0, column=2, sticky="e"+"w", padx=2, pady=2)def close_search():textPad.tag_remove("match", "1.0", END)t.destroy()t.protocol("WM_DELETE_WINDOW", close_search)def mypopup(event):# global editmenueditmenu.tk_popup(event.x_root, event.y_root)def search(needle, cssnstv, textPad, t, e):textPad.tag_remove("match", "1.0", END)count = 0if needle:pos = "1.0"while True:pos = textPad.search(needle, pos, nocase=cssnstv, stopindex=END)if not pos:breaklastpos = pos+str(len(needle))textPad.tag_add("match", pos, lastpos)count += 1pos = lastpostextPad.tag_config('match', fg='yellow', bg="green")e.focus_set()t.title(str(count)+"个被匹配")

3.3 功能实现

# 文件功能
filemenu = Menu(top)
filemenu.add_command(label="新建", accelerator="Ctrl+N", command=mynew)
filemenu.add_command(label="打开", accelerator="Ctrl+O", command=myopen)
filemenu.add_command(label="保存", accelerator="Ctrl+S", command=mysave)
filemenu.add_command(label="另存为", accelerator="Ctrl+shift+s", command=mysaveas)
menubar.add_cascade(label="文件", menu=filemenu)# 编辑功能
editmenu = Menu(top)
editmenu.add_command(label="撤销", accelerator="Ctrl+Z", command=undo)
editmenu.add_command(label="重做", accelerator="Ctrl+Y", command=redo)
editmenu.add_separator()
editmenu.add_command(label="剪切", accelerator="Ctrl+X", command=cut)
editmenu.add_command(label="复制", accelerator="Ctrl+C", command=copy)
editmenu.add_command(label="粘贴", accelerator="Ctrl+V", command=paste)
editmenu.add_separator()
editmenu.add_command(label="查找", accelerator="Ctrl+F", command=find)
editmenu.add_command(label="全选", accelerator="Ctrl+A", command=select_all)
menubar.add_cascade(label="编辑", menu=editmenu)# 关于 功能
aboutmenu = Menu(top)
aboutmenu.add_command(label="作者", command=author)
aboutmenu.add_command(label="版权", command=power)
menubar.add_cascade(label="关于", menu=aboutmenu)top['menu'] = menubar#shortcutbar = Frame(top, height=25, bg='light sea green')
#shortcutbar.pack(expand=NO, fill=X)
#Inlabe = Label(top, width=2, bg='antique white')
#Inlabe.pack(side=LEFT, anchor='nw', fill=Y)textPad = Text(top, undo=True)
textPad.pack(expand=YES, fill=BOTH)
scroll = Scrollbar(textPad)
textPad.config(yscrollcommand=scroll.set)
scroll.config(command=textPad.yview)
scroll.pack(side=RIGHT, fill=Y)

3.4 绘制界面

top = Tk()
top.title("记事本")
top.geometry("600x400+100+50")

3.5 设定快捷键

# 热键绑定
textPad.bind("<Control-N>", mynew)
textPad.bind("<Control-n>", mynew)
textPad.bind("<Control-O>", myopen)
textPad.bind("<Control-o>", myopen)
textPad.bind("<Control-S>", mysave)
textPad.bind("<Control-s>", mysave)
textPad.bind("<Control-A>", select_all)
textPad.bind("<Control-a>", select_all)
textPad.bind("<Control-F>", find)
textPad.bind("<Control-f>", find)