用python寫一個簡單的登錄

#coding=utf-8

'''
需求：要求注冊賬戶，然后注冊的賬戶登錄到系統后，顯示出登錄的昵稱
1.注冊的函數
2.登錄的函數
3.獲取昵稱的函數
'''

def Inout():
 username = input('username:\n')
 password = input('password please:\n')
 return username,password

def register():
 username, password = Inout()
 temp=username+'|'+password
 with open('login.md','w') as f:
 f.write(temp)

def login():
 '''登錄函數'''
 username,password=Inout()
 with open('login.md','r') as f:
 info=f.read()
 info=info.split('|')
 if username==info[0] and password==info[1]:
 return True
 else:
 return False

def getNick(func):
 '''獲取昵稱'''
 with open('login.md','r') as f:
 info=f.read()
 info=info.split('|')
 if func:
 print('{0}您好，歡迎您登錄'.format(info[0]))
 else:
 print('請登錄')

# if __name__=='__main__':
def main():
 while True:
 try:
 t=input('1.注冊 2.登錄 3.退出系統\n')
 #如果是float類型的處理
 if isinstance(t,float):
 t=int(t)
 elif isinstance(t,str):
 #判斷字符串是否大於1位，如果是，取出第一位，並把字母轉為數字
 if len(t)==1:
 t=ord(t)
 else:
 t=int(ord(list(t)[0]))
 except Exception as e:
 print(e.args)
 else:
 if t==1:
 register()
 elif t==2:
 getNick(login())
 elif t==3:
 import sys
 sys.exit()
 else:
 print('請注冊！')
 finally:
 pass
main()