python raw_input def输入问题

Question

我只发布问题所在的部分，程序没有错误（除了这个raw_input问题之外，所有代码都是有效的）

我用search_function(1)等进行了测试，结果奏效了。在

但是如果我做这个while循环，它不会打印任何东西。 输出示例：

Enter a number to print specific table, or STOP to quit: 2 Enter a number to print specific table, or STOP to quit: 2 Enter a number to print specific table, or STOP to quit: 1 Enter a number to print specific table, or STOP to quit: Enter a number to print specific table, or STOP to quit: 1 Enter a number to print specific table, or STOP to quit: Enter a number to print specific table, or STOP to quit: STOP

def search_function(x):
    if x == 1:
        for student in students:
            print "%-17s|%-10s|%-6s|%3s" % student.print_information()
        print '\n'

    if x == 2:
        print "%-17s|%-10s|%s" %(header[0],header[1],header[4])
        print "-" * 45
        for student in students:
            print "%-17s|%-10s|%s" %student.print_first()
        print '\n'
        print "Simple Analysis on favorite sports: "
        # Printing all sports that are specified by students
        for s in set(Student.sports): # class attribute
            print s, Student.sports.count(s), round(((float(Student.sports.count(s)) / num_students) *100),1)

        # Printing sports that are not picked 
        allsports = ['Basketball','Football','Other','Baseball','Handball','Soccer','Volleyball','I do not like sport']
        for s in set(allsports) - set(Student.sports):
            print s, 0, '0%'
        choice_list = Student.sports
        for choice in choice_list:
            choice_dict[choice] = choice_dict.get(choice, 0) + 1
        print max(choice_dict)
        print min(choice_dict)

    elif x == 3:
        print "%-17|%-10s|%-16s|%s" %(header[0],header[1],header[5],header[6])
        print "-" * 45
        for student in students:
            print "%-17s|%-10s|%-16s|%s" % student.print_second()
        print '\n'

    elif x == 4:
        print "%-17s|%-10s|%s" %(header[0],header[1],header[7])
        print "-" * 45
        for student in students:
            print "%-17s|%-10s|%s" %student.print_third()
        print '\n'

    elif x == 5:
        print "%-17s|%-10s|%-15s|%s" %(header[0],header[1],header[8],header[9])
        print "-" * 45
        for student in students:
            print "%-17s|%-10s|%-16s|%s" % student.print_fourth()
        print '\n'

x = raw_input("Enter a number to print specific table, or STOP to quit: ")
while x != 'STOP':
    search_function(x)
    x = raw_input("Enter a number to print specific table, or STOP to quit: ")

Answer 1

首先测试x == 'STOP'，如果为真，break，否则转换为int并调用search_function：

while True:
    x = raw_input("Enter a number to print specific table, or STOP to quit: ")
    if x == 'STOP':
        break
    search_function(int(x))

Answer 2

raw_input()返回字符串，而代码需要整数。使用search_function(int(x))或更改条件与字符串进行比较。在