在Python中,拆分字符串来进行一些数学运算会产生奇怪的结果

Question

所以我承认这是一个家庭作业,但我并不是要求你们为我做这件事,我只是在寻找一些指导.我们需要制作一个Python程序,以单个字符串中的小时:分钟(2:30)格式接受时间,并输出以分钟为单位的时间量.(即2小时30分钟= 150分钟)

我仍然需要解决字符串输入的一些限制:

1. 确保它只使用数字和冒号
2. 确保它只能接受五个字符(##:##)
3. 确保中间字符是冒号(即数字的顺序正确)
4. 并确保如果输入像4:35这样的时间,则会自动在前面添加零

我稍后会解决这个问题 - 现在我决定从输入中得到数学.

将字符串分成两部分是有意义的:小时和分钟.然后,我将小时数乘以60,并将它们添加到预先存在的分钟数,以获得总分钟数.但是,现在,进入02:45的时间输出分钟金额为020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020245.

知道这里可能出了什么问题吗？需要明确的是,这是家庭作业,我想自己解决输入限制,我只需要帮助解决这个数学问题.

#Henry Quinn - Python Advanced 4.0 Hours and Minutes
import re
print "This program takes an input of time in hours and minutes and outputs the amount    of minutes."
count = 0

#I still need to work out while loop
#Supposed to make sure that a time is entered correctly, or error out
while (count <1):
    time = raw_input("Please enter the duration of time (ex: 2:15 or 12:30): ")
    if not re.match("^[0-9, :]*$", time):
        print "Sorry, you're only allowed to use the numbers 0-9."
    elif len(time) > 5:
        print "Sorry, only five characters max allowed."
#MAKE THIS CHECK FOR A COLON
#elif
#elif
    else:
        count = count + 1

#If time = 12:45, hours should be equal to 12, and minutes should be equal to 45
hours = time[:2]
minutes = time[3:]

#Should convert hours to minutes
newhours = hours * 60

#Should make total amount of minutes
totalminutes = newhours + minutes

print "The total amount of elapsed minutes is %s" % (totalminutes)

raw_input("Please press Enter to terminate the program.")

Answer 1

现在,小时和分钟是字符串变量,而不是整数.因此,你不能像数字那样乘以它们.

将第20行和第21行更改为

hours = int(time[:2])
minutes = int(time[3:])

并且在02:45投入应该可行.但是,如果你没有领先0(如果你放入2:45),你仍会遇到问题,所以我建议你把它拆分为":",如下所示:

hours = int(time.split(":")[0])
minutes = int(time.split(":")[1])