如何在python中打印字典键和值

Question

我必须制作一个程序，要求用户为每个学生输入学生姓名和成绩。 并将它们作为 [keys] 和 [values] 放入字典中。 当用户输入“q”时，程序退出，然后打印学生和他们的成绩，如下所示：

Student Grade
Student1 A
Student2 B
Student3 C

我的代码如下所示：

student_grades = {}

while True:

    ## Get the Name [key in dictionary] of the student
    name = raw_input("Please give me the name of the student (press q to quit): \n")

    if name == 'q':
        print "Okay, printing grades! \n"
        for x in student_grades:
            print student_grades.keys() + student_grades.values()
        break

    # Chcek if name isn't valid
    elif name.isdigit():
        print "Sorry, {} isn't valid".format(name)
        name = raw_input("Please give me the name of the student (press q to quit): \n")

    ## Get the grade [value in dictionary] of the student
    grade = raw_input("Please give me their grade: (e.g 'A', 'B', 'C', 'D', 'F') \n")

    # Check if grade isn't valid
    if not grade in ['A', 'B', 'C', 'D', 'F']:
        print "Sorry, {} isn't valid".format(grade)
        grade = raw_input("Please give me their grade: (e.g 'A', 'B', 'C', 'D', 'F') \n")
        # Assign Name to Grade
        student_grades[name] = grade

当我输入“q”时，程序应该打印学生姓名和成绩的键和值，但它什么也不打印

Answer 1

您可以像这样访问字典的键和值：

for k, v in mydict.iteritems():
    print(k, v)

在 Python 3 中，这被更改/改进为：

for k, v in mydict.items():
    print(k, v)