我想在每次操作完成后返回主菜单，例如添加学生，删除等等....我只是不知道该怎么做，请帮忙。 还有一件事，如果我为每个操作创建函数它将如何工作？
PS：我很抱歉，如果有人已发布此问题，我无法找到与此问题相关的任何问题，而且我是新的，所以请放轻松！ 的由于import time
import sqlite3
import sys
""" Program Info """
AppName = "Student Manager"
AppVersion = "1.4.2V"
AppAuthor = "Zaidan Chaudhary"
print("{} || {} || {}".format(AppName, AppVersion, AppAuthor))
time.sleep(2)
""" Start Of Program """
print("\n***Welcome To Student Manager***")
print("Main Menu\n\n1: Login\n2: Sign Up\n3: Exit")
"""Start of Program """
def Start():
""" Creating SQl Database and Table in it """
con = sqlite3.connect("StudentManager.db")
cursor = con.cursor()
cursor.execute("CREATE TABLE IF NOT EXISTS LoginSystem(firstName TEXT, lastName TEXT, username TEXT, password TEXT)")
"""Main Program """
while True:
try:
InputMenu = int(input("Please select an option from Menu: "))
break
except ValueError:
print("\nPlease enter in numbers [1, 2, 3]\n")
if InputMenu == 1:
LogUsername = input("Please enter your username: ")
LogPassword = input("Please enter your password: ")
cursor.execute("SELECT * FROM LoginSystem WHERE username = ? AND password = ?", (LogUsername, LogPassword))
CheckingLogin = cursor.fetchall()
if CheckingLogin:
for i in CheckingLogin:
print("Welcome " + i[0] + "" + i[1] + " to your dashboard\n")
cursor.execute("CREATE TABLE IF NOT EXISTS Students(firstName TEXT, lastName TEXT, grade TEXT, "
"age TEXT, phoneNo TEXT, address TEXT)")
### This Is My MAIN MENU #####
print("1: Add Students\n2: View Students\n3: Delete Students\n4: Exit")
while True:
try:
UserEntry = int(input("Please select an option from Main Menu: "))
break
except ValueError:
print("\nError!\nPlease enter in numbers...\n")
if UserEntry == 1:
StudentFirstName = input("Please enter student's first name: ")
StudentLastName = input("Please enter student's last name: ")
StudentGrade = input("Please enter student's grade: ")
StudentAge = input("Please enter student's age: ")
StudentPhoneNO = input("Please enter his/her parent's phone number: ")
StudentAddress = input("Please enter student's home address: ")
StudentFirstName.title()
StudentLastName.title()
StudentGrade.title()
StudentPhoneNO.title()
StudentAge.title()
StudentAddress.title()
cursor.execute("INSERT INTO Students VALUES(?, ?, ?, ?, ?, ?)",
(StudentFirstName, StudentLastName, StudentGrade, StudentAge, StudentPhoneNO,
StudentAddress))
con.commit()
print("Student Added Successfully!")
elif UserEntry == 2:
print("1: View All Students\n2: View By FirstName\n3: View By Grade")
while True:
try:
Entry = int(input("Please select an option from Menu: "))
break
except ValueError:
print("Please select in numbers...\n")
if Entry == 1:
cursor.execute("SELECT * FROM Students")
AllStudents = cursor.fetchall()
AllStudents.sort()
for b in AllStudents:
print("Student Name: {} ".format(b[0]) + "{}".format(b[1]))
print("Student grade: {}".format(b[2]))
print("Student age: {}".format(b[3]))
print("Phone Number: {}".format(b[4]))
print("Home Address: {}\n".format(b[5]))
elif Entry == 2:
ViewFirst = input("Please enter students first name: ")
cursor.execute("SELECT * FROM Students WHERE firstName = ?", (ViewFirst,))
StudentInfo = cursor.fetchall()
for g in StudentInfo:
print("Student Name: {} ".format(g[0]) + "{}".format(g[1]))
print("Student grade: {}".format(g[2]))
print("Student age: {}".format(g[3]))
print("Phone Number: {}".format(g[4]))
print("Home Address: {}\n".format(g[5]))
elif Entry == 3:
Grade = input("Please enter student's grade/class: ")
cursor.execute("SELECT * FROM Students WHERE grade = ?", (Grade,))
StudentGradeInfo = cursor.fetchall()
for p in StudentGradeInfo:
print("Student Name: {} ".format(p[0]) + "{}".format(p[1]))
print("Student grade: {}".format(p[2]))
print("Student age: {}".format(p[3]))
print("Phone Number: {}".format(p[4]))
print("Home Address: {}\n".format(p[5]))
elif UserEntry == 3:
DelName = input("Enter student's firstname you want to delete: ")
DelName.title()
cursor.execute("DELETE FROM Students WHERE firstName = ?", (DelName,))
con.commit()
AllStudents = cursor.fetchall()
print("Student Deleted Successfully")
for b in AllStudents:
print(b)
elif UserEntry == 4:
print("Closing App......")
time.sleep(2)
sys.exit()
else:
print("Invalid Username or Password")
elif InputMenu == 2:
while True:
firstName = input("Please enter your First Name: ")
lastName = input("Please enter your Last Name: ")
Username = input("Please enter new username: ")
Password = input("Please enter password: ")
ConfirmPass = input("Please re-enter password: ")
if Password == ConfirmPass:
cursor.execute("INSERT INTO LoginSystem VALUES(?, ?, ?, ?)", (firstName, lastName, Username, Password))
con.commit()
con.close()
print("User Registered")
break
else:
print("Error!\n Unable to Register\n Please recheck information")
elif InputMenu == 3:
print("Closing App....")
time.sleep(2)
sys.exit()
""" End Of Start Function """
Start()
答案 0 :(得分：0)
我在伪代码中回答这个问题，它会更容易理解。
while True:
if Operation happening:
MainMenu.hide()
elif Operation not happening:
MainMenu.show()
无论函数是否重定向到不同的页面，这都应该有效，因为一旦函数完成，MainMenu就会显示（只有当它完全确定操作没有发生时，才会显示＆＃34; elif＆＃34 ）。
要回答第二个问题，请保持while循环运行。
running = True
while running:
command = input('> ')
if "this_happens":
execute_function(params)
我知道这是最简单的方法。每当用户想要做某事时，他们都可以在这里输入。然后使用if语句检查用户想要做什么，然后执行它。你可以采用不同的方式，但这只是一个例子。