python 获取已安装软件列表并找出要求安装但为安装的软件名子

需求：查看Windows是否安装了要求安装的软件

#encoding:utf-8
import winreg
import os
import ctypes, sys

#要求安装的
expec_soft = []
#已经安装要求的
installed_soft = []

def is_admin():
    try:
        #print(ctypes.windll.shell32.IsUserAnAdmin())
        return ctypes.windll.shell32.IsUserAnAdmin()
    except:
        return False

def query_soft_list():
    sub_key = [r'SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall', r'SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall']
    
    software_name = []
    
    for i in sub_key:
        key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, i, 0, winreg.KEY_ALL_ACCESS)
        for j in range(0, winreg.QueryInfoKey(key)[0]-1):
            try:
                key_name = winreg.EnumKey(key, j)
                key_path = i + '\\' + key_name
                each_key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, key_path, 0, winreg.KEY_ALL_ACCESS)
                DisplayName, REG_SZ = winreg.QueryValueEx(each_key, 'DisplayName')
                DisplayName = DisplayName
                software_name.append(DisplayName)
            except WindowsError:
                pass
    
    #去重排序
    software_name = list(set(software_name))
    software_name = sorted(software_name)

    #读要求安装的软件
    if not os.path.exists('必须安装.txt'):
        with open('error.txt','w') as f:
            f.write('请创建<必须安装.txt>')
            sys.exit(1) 

    with open('必须安装.txt','r') as f:
        rs = f.readlines()

    for rss in rs:
        expec_soft.append(rss.strip("\r\n"))

    for rsss in expec_soft:
        print(rsss)
    #打印符合要求的已安装软件
    for soft1 in expec_soft:
        if soft1 in software_name:
            installed_soft.append(soft1.strip('\r\n'))

    for inst in installed_soft:
        print(inst)
        with open ('已安装.txt','a') as f:
            f.write(inst)
            f.write('\n')

    #将安装的所有软件写入文档
    for soft in software_name:
        print(soft)
        with open('program_list.txt','a') as f:
            f.write(soft)
            f.write('\n')


if __name__ == "__main__":
    if is_admin():
        query_soft_list()
        puase = input('按回车退出....')
    else:
        print('单击右键以管理员身份运行....')
        puase = input('按回车退出....')
        sys.exit(1)