循环,直到在Python中收到特定的用户输入

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您好我正在为学校做评估.我是python的新手,我真的不知道如何循环这个

    achieved=50 #predefined variables for grade input

merit=70

excellence=85

max=100
import re #imports re an external modeule which defines re
studentfname = input("Input Student first name in lowercase")
if any( [ i>'z' or i<'a' for i in studentfname]):#checks if is in lowercase letters
    print ("Invalid input must be letter and in lowercase")
    import re
studentlname = input("Input Student last name in lowercase")
if any( [ i>'z' or i<'a' for i in studentlname]):
    print ("Invalid input must be letter and in lowercase")
    import sys
    raise SystemExit
    print(studentfname)
elif len(studentlname)>30:
    print ("Very long string") 
    raise SystemExit
    import re
teacherfname = input("Input your first name in lowercase")
if any( [ i>'z' or i<'a' for i in teacherfname]):
    print ("Invalid input must be letter and in lowercase")
    import sys
    raise SystemExit
    print(teacherfname)
elif len(teacherfname)>30:
    print ("Very long string") 
    raise SystemExit
    print(teacherfname)
teacherlname = input("Input your last name in lowercase")
if any( [ i>'z' or i<'a' for i in teacherlname]):
    print ("Invalid input must be letter and in lowercase")
    import sys
    raise SystemExit
    print(teacherlname)
elif len(teacherlname)>30:
    print ("Very long string") 
    raise SystemExit
    print(teachercode)
teachercode = input("Input your teacher code in lowercase")
if any( [ i>'z' or i<'a' for i in teachercode]):
    print ("Invalid input must be letter and in lowercase")
    import sys
    raise SystemExit
    print(teachercode)
elif len(teachercode)>30:
    print ("Very long string") 
    raise SystemExit
    print(teachercode)

while True: #inputs student depending on the input prints out results id achieved, merit and excellence
 try:
    grade = int(input("Enter student's grade"))

    print(str(grade))
    break
 except ValueError: 

  continue
#prints if not a number stops letters
if grade >merit>excellence>= achieved: 
 print("Achieved")
if grade < achieved:
    print("not achieved")
if grade >=merit>excellence < excellence:
    print("merit")
if grade >= excellence > merit:
    print("excellence")
if grade < 0:
    print("can't be negative")
    raise SystemExit
if grade > max:
   print("Cannot be more than 100")
   raise SystemExit
print("student's details")#last print of variablesa
print(studentfname,studentlname)
print("teacher's details")
print(teacherfname,teacherlname,teachercode)
print("student's grade")
print(grade)
if grade >merit>excellence>= achieved: 
 print("Achieved")
if grade < achieved:
    print("not achieved")
if grade >=merit>excellence < excellence:
    print("merit")
if grade >= excellence > merit:
    print("excellence")
if grade < 0:
    print("can't be negative")
    raise SystemExit
if grade > max:
   print("Cannot be more than 100")
   raise SystemExit
print("Thanks for adding in the grades")

        break

我试图做到这一点,以便它会询问用户他们是否想在完成一个学生后输入更多的学生数据.例如,如果他们希望继续并且基本上再次重复编码.我真的很想得到一些帮助

解决方法:

要回答你的问题,你需要的是循环,直到给出给定的输入.
所以你会用：

while True:    # infinite loop
    user_input = raw_input("Want to continue? ")
    if user_input == "No":
        break  # stops the loop
    else:
        # do whatever computations you need

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