擅长:python、mysql、java
<p>您需要将self传递给您的方法,以便在类实例化之后使用它,并在调用self时通过self访问它</p>
<pre><code>class Main:
def main_page(self):
print("===== | MAIN MENU |=====")
print("|| ||")
print("========================")
print("1 - STUDENT ")
print("2 - SUBJECT ")
print("3 - QUIT ")
allchoice = ['1', '2', '3'];
choice = input()
while choice not in allchoice:
print("Invalid Please try again")
self.main_page()
if choice == '1':
print("Hello world")
elif choice == '2':
print("back world")
else:
quit()
mainout = Main()
mainout.main_page()
</code></pre>