循环直到在Python中接收到特定的用户输入[重复]

Question

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

我正在尝试让它在完成一名学生后询问用户是否愿意输入更多学生数据。例如，如果他们希望继续并基本上再次重复编码。我真的很想得到一些帮助

Answer 1

我遇到了同样的问题并设法以一种更简单的方式修复它，而不必对任何代码进行太多更改，例如，假设您希望在用户输入“是”之前提出问题：

print ("Question here")
Input = input("").lower() 
if Input == "yes":
    break
    nextcode() //optional
else:
    while Input != "yes":
    print ("Question here")
    Input = input("").lower()
    if Input == "back":
        break
        nextcode() //optional

如果您有一个清晰的功能并在提问之前清除屏幕，这样它就不会堆积起来，这样效果最好。 如果这不起作用，请摆脱 break 并执行 nextcode()

Answer 2

你只是循环它

achieved=50 #predefined variables for grade input

merit=70

excellence=85

max=100
import sys
import re #imports re an external modeule which defines re
while(1):
    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")
        raise SystemExit
    print(studentfname)
    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")
        raise SystemExit
    elif len(studentlname)>30:
        print ("Very long string")
        raise SystemExit
    print(studentlname)
    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")
        raise SystemExit
    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")
        raise SystemExit
    elif len(teacherlname)>30:
        print ("Very long string")
        raise SystemExit
    print(teacherlname)
    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")
        raise SystemExit
    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))
        except ValueError:
            continue
        if grade >merit>excellence>= achieved:
            graden = "Achieved"
            print("Achieved")
        if grade < achieved:
            print("not achieved")
        if grade >=merit>excellence < excellence:
            graden = "merit"
            print("merit")
        if grade >= excellence > merit:
            graden = "excellence"
            print("excellence")
        if grade < 0:
            print("can't be negative")
            raise SystemExit
        if grade > max:
            print("Cannot be more than 100")
            raise SystemExit
        print(grade)
        print("Student")
        print(studentfname)
        print(studentlname)
        print("Teacher")
        print(teacherfname)
        print(teacherlname)
        print(teachercode)
        print("Grade")
        print(str(grade))
        print(graden)
        print("Thanks for adding in the grades")
        break
    if input('More?')=='no': break

现在可以了。只需记住输入中的引号即可。或者修复它。

Answer 3

要回答您的问题，您需要循环直到给出给定的输入。 所以你会使用：

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