Student management system~~~

1 stu_list = []
 2  def func1():
 3      num_srt = input( ' Please enter the student number: ' )
 4      num = int(num_srt)
 5      name = input( ' Please enter the name of the freshman: ' )
 6      age = input( ' Please enter the age of the new student: ' )
 7      stu = { ' stu_num ' :num, ' stu_name ' :name, ' stu_age ' :age}
 8      stu_list.append(stu)
 9      print (' Added successfully ' )
 10  
11  def func2():
 12      num_str = input( ' Please enter student number: ' )
 13      num = int(num_str)
 14      is_exists = True
 15      for stu in stu_list:
 16          num1 = stu.get( ' stu_num ' )
 17          if num1 == num:
 18              stu_list.remove(stu)
 19              print ( ' Remove successful! ' )
 20             is_exists = False
 21      if is_exists:
 22              print ( ' The student ID you entered does not exist! ' )
 23  
24  def func3():
 25      num_str = input( ' Please enter the student ID of the student you want to modify: ' )
 26      num = int (num_str)
 27      is_exists = True
 28      for stu in stu_list:
 29          num1 = stu.get( ' stu_num ' )
 30          if num1 == num:
 31              print( ' Student ID is: ' ,stu.get( ' stu_num ' ), ' Name is: ' ,stu.get( ' stu_name ' ), ' Age is: ' ,stu.get( ' stu_age ' ))
 32              new_age = input( ' Please enter the new age: ' )
 33              stu[ ' stu_age ' ]= int(new_age)
 34              print ( ' The modification is successful! ')
35             is_exists = False
36     if is_exists:
 37          print ( ' The student number you entered does not exist! ' )
 38  
39  def func4():
 40      num = int(input( ' Please enter the student number: ' ))
 41      is_exists = True
 42      for stu in stu_list:
 43          num1 = stu.get( ' stu_num ' )
 44          if num1 == num:
 45              print ( ' Student number is: ' ,stu.get( ' stu_num ' ),' Name is: ' , stu.get( ' stu_name ' ), ' Age is: ' , stu.get( ' stu_age ' ))
 46              is_exists = False
 47      if is_exists:
 48          print ( ' The student number input is incorrect, please check Then input again! ' )
 49  
50  def main():
 51      while True:
 52          choice = input( ' A, add student B, delete student C according to student number, modify information D, query E, exit ' )
 53          if choice = = ' A' or choice == 'a':
54             func1()
55         elif choice == 'B' or choice == 'b':
56             func2()
57         elif choice == 'C' or choice == 'c':
58             func3()
59         elif choice == 'D' or choice == 'd':
60             func4()
 61          elif choice == ' E '  or choice == ' e ' :
 62              break 
63      print ( ' Current class student information: ' )
 64      for stu in stu_list:
 65          print ( ' Student number is: ' ,stu. get( ' stu_num ' ), ' name is: ' ,stu.get( ' stu_name ' ), ' age is: ' ,stu.get( 'stu_age'))
66         print('****'*10)
67 
68 main()