循环加20分钟直到17:16

Question

我要打印代码： 火车明天13:36发车 . . 火车明天17:16开 火车每20分钟开一次

这是我迄今为止所尝试的

h = 13
m = 36
i = 20
while(True):
    m = m + i
    if m >= 60:
        h = h + 1 and m = 0
        if h > 17 and m > 16:
            break
        print("The train will leave at {0:0d}:{1:0d} tomorrow".format(h, m))

当运行代码时，我得到“SyntaxError:cannotassigntooperator” 我做错什么了

Answer 1

不要试图用这种天真的方式与时间共事。有那么多的用例和边缘案例需要考虑和处理

使用适当的时间对象（在本例中是datetime，因为是纯的^{} objects do no support ^{} calculations）

from datetime import datetime, timedelta

current_time = datetime.now().replace(hour=13, minute=16)
end_time = datetime.now().replace(hour=17, minute=16)
delta_minutes = 20

while current_time <= end_time:
    print("The train will leave at {} tomorrow".format(current_time.strftime('%H:%M')))
    current_time += timedelta(minutes=delta_minutes)

输出

The train will leave at 13:16 tomorrow
The train will leave at 13:36 tomorrow
The train will leave at 13:56 tomorrow
The train will leave at 14:16 tomorrow
The train will leave at 14:36 tomorrow
The train will leave at 14:56 tomorrow
The train will leave at 15:16 tomorrow
The train will leave at 15:36 tomorrow
The train will leave at 15:56 tomorrow
The train will leave at 16:16 tomorrow
The train will leave at 16:36 tomorrow
The train will leave at 16:56 tomorrow
The train will leave at 17:16 tomorrow