Python编程空白输出

Question

while True:
    num=raw_input("Please enter a number.")
    if (num == 1):
        print "Sunday"
    elif (num==2):
        print "Monday"
    elif (num==3):
        print "Tuesday"
    elif (num==4):
        print "Wednesday"
    elif (num==5):
        print "Thursday"
    elif (num==6):
        print "Friday"
    elif (num==7):
        print "Saturday"
    else:
        print "Invalid Choice!"

    option = raw_input("Would you like to continue playing?")
    if (option=="yes"):
        continue
    elif (option=="no"):
        break

这是我的代码.当我由于某种原因运行它时,第一部分(一周的那一天)的输出作为"其他"选项出现,即"无效选择".当我删除else语句时,输出只是空白.稍微混淆了为什么会发生这种情况.

Answer 1

raw_input将输入返回为str.int如果要将其用作if语句的条件,则必须将其转换为.

num=int(raw_input("Please enter a number."))

请注意,如果用户未输入数字,则会引发错误.