feat: add PySimpleGUI calculator & notepad GUI demo scripts

src/Demo_Calculator_Simple.py

@@ -0,0 +1,29 @@
+import PySimpleGUI as sg
+
+# 界面布局
+layout = [
+    [sg.Input(key='input', size=(20,1)), sg.Button('C')],
+    [sg.Button('1'),sg.Button('2'),sg.Button('3'),sg.Button('+')],
+    [sg.Button('4'),sg.Button('5'),sg.Button('6'),sg.Button('-')],
+    [sg.Button('7'),sg.Button('8'),sg.Button('9'),sg.Button('*')],
+    [sg.Button('0'),sg.Button('.'),sg.Button('/'),sg.Button('=')]
+]
+window = sg.Window('简易计算器', layout)
+expr = ''
+while True:
+    event, val = window.read()
+    if event in (None, 'Exit'):
+        break
+    if event == 'C':
+        expr = ''
+        window['input'].update('')
+    elif event == '=':
+        try:
+            res = eval(expr)
+            window['input'].update(str(res))
+        except:
+            window['input'].update('Error')
+    else:
+        expr += event
+        window['input'].update(expr)
+window.close()

src/Demo_Notepad_Simple.py

@@ -0,0 +1,36 @@
+import PySimpleGUI as sg
+
+# 窗口布局
+layout = [
+    [sg.Text("简易记事本")],
+    [sg.Multiline(size=(60, 20), key="-TEXT-")],
+    [
+        sg.Button("保存文件"),
+        sg.Button("读取文件"),
+        sg.Button("清空"),
+        sg.Button("退出")
+    ]
+]
+
+window = sg.Window("记事本", layout)
+
+while True:
+    event, values = window.read()
+    if event in (sg.WIN_CLOSED, "退出"):
+        break
+    if event == "清空":
+        window["-TEXT-"].update("")
+    elif event == "保存文件":
+        path = sg.popup_get_file("保存文件", save_as=True, file_types=(("文本文件", "*.txt"),))
+        if path:
+            with open(path, "w", encoding="utf-8") as f:
+                f.write(values["-TEXT-"])
+            sg.popup("保存成功！")
+    elif event == "读取文件":
+        path = sg.popup_get_file("读取文件", file_types=(("文本文件", "*.txt"),))
+        if path:
+            with open(path, "r", encoding="utf-8") as f:
+                content = f.read()
+            window["-TEXT-"].update(content)
+
+window.close()