Code

import PySimpleGUI as sg
import sys

layout_pwd = [
    [sg.Text('请输入密码！')],
    [sg.Input(password_char='*')],
    [sg.Button('       确定       '), sg.Button('      关闭      ')]
]
w = sg.Window('请输入密码', layout=layout_pwd)
while True:
    event, values = w.read()
    print(event)
    print(values)
    if event in (None, '      关闭      '):
        sys.exit()
    elif values[0] == '123':
        print(values[0])
        break
w.close()
layout = [[sg.Text('选择xml文件夹')], [sg.Input(), sg.FolderBrowse('浏览')],
          [sg.Text('选择"计算机应用基础"excel文件')], [sg.Input(), sg.FileBrowse('浏览')],
          [sg.Text('选择"考试通知单"excel文件')], [sg.Input(), sg.FileBrowse('浏览')],
          [sg.Text('处理进度')], [sg.ProgressBar(1000, orientation='h', size=(40, 20), key='progressbar')],
          [sg.Button(' 开始处理 '), sg.Button('      关闭      ')]]

window = sg.Window('合并考试通知单(xlrd and xlutils 版)', layout, icon='icon/puple128.ico')
while True:
    event, values = window.read()
    if event in (None, '      关闭      '):
        break
window.close()

效果：

密码正确后，窗口自动跳转到下一窗口；

增加过期时间和密码错误判断

# 设置软件过期时间
data = '2020-8-21 13:50:00'
data_array = time.strptime(data, "%Y-%m-%d %H:%M:%S")
timeStamp = int(time.mktime(data_array))

layout_pwd = [
    [sg.Text('请输入密码！')],
    [sg.Input(password_char='*')],
    [sg.Button('确定', size=(10, 1)), sg.Button('关闭', size=(10, 1))]
]
w = sg.Window('请输入密码', layout=layout_pwd)
while True:
    event, values = w.read()
    print(event)
    print(values)
    if event in (None, '关闭'):
        sys.exit()
    elif time.time() > timeStamp:
        sg.Popup('软件已过期！请联系作者')
    elif values[0] == '123':
        print(values[0])
        break
    else:
        sg.Popup('密码不正确！')
w.close()