循环和保存多个输入

Question

我正在尝试遍历一组输入，在这些输入中我询问用户的课程成绩、课程时间和课程代码。循环不断重复，直到用户输入“完成”。用户输入完成后，我希望它打印出输入的课程以及成绩和小时数。

例如：

course_count = False

#LOOP through Inputs
while not course_count:

    #GET course code
    course_code = input( "Please Enter the Course Code (or done if finished): " )

    #IF course code is not equal to done (convert to lowercase)
    if course_code.lower() != "done":

        #GET course hours
        course_hours = int( input( "How many credit hours was " + course_code + "? " ) )

        #GET grade earned
        course_grade = float( input( "What grade did you earn in " + course_code + "? " ) )

    #ELSE END LOOP
    else:
        course_count = True

    print("Course: " + course_code + " Weight: " + str( course_hours ) + " hours " + "Grade: " + str( course_grade ) + "%")

问题是它总是只打印一门输入的课程、小时数和年级。如何仅使用累积字符串保存多个答案？

我想要的输出是：

# Please Enter the Course Code (or done if finished): COMP 10001
# How many credit hours was COMP 10001? 5
# What grade did you earn in COMP 10001? 75

# Please Enter the Course Code (or done if finished): COMP 20002
# How many credit hours was COMP 10001? 8
# What grade did you earn in COMP 10001? 95

# Please Enter the Course Code (or done if finished): done

# Course: COMP 10001 Weight: 5 Grade: 75%
# Course: COMP 20002 Weight: 8 Grade: 95%

这是针对学校练习题的，如果有意义，则不允许使用列表、数组或字典

Answer 1

您可能会发现将您的信息保存在 dictionary 结构中很有用，其中密钥作为课程代码存储。然后就像遍历字典中保存的每门课程以获取详细信息一样简单。

示例：

course_count = False
course_info = {}
#LOOP through Inputs
while not course_count:

    #GET course code
    course_code = input( "Please Enter the Course Code (or done if finished): " )
    course_info[course_code] = {};

    #IF course code is not equal to done (convert to lowercase)
    if course_code.lower() != "done":

        #GET course hours
        course_hours = int( input( "How many credit hours was " + course_code + "? " ) )
        course_info[course_code]['hours'] = course_hours;

        #GET grade earned
        course_grade = float( input( "What grade did you earn in " + course_code + "? " ) )
        course_info[course_code]['grade'] = course_grade

    #ELSE END LOOP
    else:
        course_count = True

For course_code in course_info :
    course_hours = course_info[course_code]['hours']
    course_grade = course_info[course_code]['grade']
    print("Course: " + course_code + " Weight: " + str( course_hours ) + " hours " + "Grade: " + str( course_grade ) + "%")

Answer 2

看看您能否将这个简化的示例与您的代码联系起来。要获得您描述的输出，您需要以某种方式存储输出文本并在以后访问它：

output_lines = []

for i in range(10):
  input_string = input("Enter some input")
  output_lines.append(input_string)

for output_line in output_lines:
  print(output_line)

来自 cmets，仅使用字符串“accumulation”（警告：二次差）：

output_text

for i in range(10):
  input_string = input("Enter some input")
  output_text = output_text + '\n' + input_string
print(output_text)

请注意，构建长字符串的首选方法是附加到列表并使用'separator'.join(list_of_strings) 或按上述方式逐一打印。

Answer 3

使用输出字符串output_string

将每一行添加到输出字符串

...
output_string += "Course: {} Weight: {} hours Grade: {}\n".format(course_code, course_hours, course_grade"
#ELSE END LOOP
...

这会将信息累积到一个字符串中，使用标准字符串格式插入来自每个循环的数据。

在程序结束时，打印输出字符串。

正如其他人所指出的，这是一种非常愚蠢的数据存储方式，因为除了打印之外，访问它会很困难。列表/字典会好很多。