如何從python datetime.time字段獲取小時整數

Question

我有一個等於3:00的datetime.time字段。

如何從這個對象中得到3作爲整數？

我曾嘗試：

transaction_time = form.cleaned_data['transaction_time'] 
print transaction_time.hour 

我得到的錯誤：

'unicode' object has no attribute 'hour'

Answer 1

根據文檔：

If a Field has required=False and you pass clean() an empty value, then clean() will return a normalized empty value rather than raising ValidationError. For CharField, this will be a Unicode empty string. For other Field classes, it might be None. (This varies from field to field.)

https://docs.djangoproject.com/en/dev/ref/forms/fields/

所以當阿倫提到的，我做的字符串操作，以確定時間：

def set_hour_for_date(customer, hour_str, transaction_date): 
    meridian = hour_str[-2:] 
    hour = int(hour_str[:2]) 
    if meridian == 'PM': 
     hour = hour + 12 
    relative_time = customer.time_zone.localize(datetime(
                 transaction_date.year, 
                 transaction_date.month, 
                 transaction_date.day, 
                 hour, 
                 0, 
                 0, 
                 294757)) 

    return relative_time 

Answer 2

好像transaction_time是類型的Unicode。您可以使用字符串操作來獲取小時部分（transaction_time [0]）或將它轉換爲datetime並獲取小時。

Answer 3

transaction_time是不是一個時間的對象，它的unicode，因此首先使用strptime將其首先轉換爲struct_time，然後獲取字段tm_hour。

from time import strptime 
t = strptime(form.cleaned_data['transaction_time'], '%H:%M') 

print t.tm_hour