时间范围之间的意外输出写入列表时隙答案

【问题标题】：Unexpected output write listing time slots between time ranges时间范围之间的意外输出写入列表时隙
【发布时间】：2018-07-17 05:25:36
【问题描述】：

我正在编写一个程序来打印两个时间范围（小时、分钟）之间的时间段范围（小时、分钟对）。我在运行时看到了意外的输出：

import datetime,time
def stamp(hour, min):
    return int(datetime.datetime(2018, 7, 17, hour,min).timestamp())
def ListSlotsAvailable(start, ent, durn):
    secdurn=durn*60
    for sec in range(start, ent, secdurn):
        enttime = sec+secdurn
        print("Stamp is %d-%d" % (sec, enttime))
        print(hour_from_stamp(sec))
        print(min_from_stamp(sec))
        print(hour_from_stamp(enttime))
        print(min_from_stamp(enttime))
def hour_from_stamp(stamp):
    import datetime
    print(datetime.datetime.fromtimestamp(stamp).strftime('%H'))

def min_from_stamp(stamp):
    import datetime
    print(datetime.datetime.fromtimestamp(stamp).strftime('%M'))

starthr=input("Give start time in hour")
startmin=input("Give start time in min")
start=stamp(int(starthr), int(startmin))
endhr=input("Give end time in hour")
endmin=input("Give end time in min")
ent=stamp(int(endhr), int(endmin))
durn=int(input("Give duration for each consultation"))
ListSlotsAvailable(start, ent, durn)

输出：

Give start time in hour10
Give start time in min15
Give end time in hour12
Give end time in min30
Give duration for each consultation30
Stamp is 1531802700-1531804500
10
None
15
None
10
None
45
None
Stamp is 1531804500-1531806300
10
None
45
None
11
None
15
None
Stamp is 1531806300-1531808100
11
None
15
None
11
None
45
None
Stamp is 1531808100-1531809900
11
None
45
None
12
None
15
None
Stamp is 1531809900-1531811700
12
None
15
None
12
None
45
None

1

我没想到那里会看到 None 值。他们来自哪里？

【问题讨论】：

标签： python-3.x datetime time

【解决方案1】：

您的函数应该返回这些字符串值，而不是打印：

def hour_from_stamp(stamp):
    import datetime
    return datetime.datetime.fromtimestamp(stamp).strftime('%H')

def min_from_stamp(stamp):
    import datetime
    print datetime.datetime.fromtimestamp(stamp).strftime('%M')

否则，没有显式返回值的函数将默认返回None。

【讨论】：