的时间到了,我试图逃跑Larry Wall的恶梦,在Perl移动到Python(工作)。为此,我正在通过深入的自我学习,从一个深夜牛仔编码员,一个人的军队,非记录员,我相信你知道像我这样的人(!),一个和平的学生Pythonic的方式。我也想在这里很有趣,所以请耐心等待。 :/
为此,我正在通过将通用代码和实用程序从Perl转换为Python的工作。本周,我一直使用我在Perl中编写的DateTime相关库来模拟Python库,该库定义了暴露相同合约的类,特别是在Olson数据库的各个时区中创建DateTime对象。这里是Perl中的例子。我很难理解如何在Python中完成等价物。请注意我在PST上写的是:
package MyDateTime;
use Moose;
use DateTime;
has day => (is => 'ro', isa => 'Int');
has hour => (is => 'ro', isa => 'Int');
has minute => (is => 'ro', isa => 'Int');
has month => (is => 'ro', isa => 'Int');
has second => (is => 'ro', isa => 'Int');
has timezone => (is => 'ro', isa => 'Str', required => 1);
has timestamp => (is => 'ro', isa => 'Num', required => 1);
has year => (is => 'ro', isa => 'Int');
around BUILDARGS => sub {
my($orig, $class, $timezone, $timestamp) = @_;
my $datetime = DateTime->from_epoch(
epoch => $timestamp,
time_zone => $timezone,
);
return $class->$orig(
day => sprintf("%02d",$datetime->day),
hour => sprintf("%02d",$datetime->hour),
minute => sprintf("%02d",$datetime->minute),
month => sprintf("%02d",$datetime->month),
second => sprintf("%02d",$datetime->second),
timezone => $timezone,
timestamp => $timestamp,
year => $datetime->year,
);
};
__PACKAGE__->meta->make_immutable;
1;
这会创建一个Perl DateTime对象,其值与给定的时区相对应。例如,在一个单独的脚本:
#!/usr/bin/env perl
use Moose;
use MyDateTime;
my $timestamp = time();
my $datetime = MyDateTime->new('America/Los_Angeles', $timestamp);
print $datetime->hour,"\n";
$datetime = MyDateTime->new('America/New_York', $timestamp);
print $datetime->hour,"\n";
它打印:
09
12
由于目前是上午在洛杉矶9点12在纽约市。
我已经能够在Python中做的最好的是如下:
import datetime, pytz, time
class DateTime:
def __init__(self, timezone, epoch):
self.timezone = timezone
self.epoch = epoch
timezoneobject = pytz.timezone(timezone)
datetimeobject = datetime.datetime.fromtimestamp(self.epoch)
self.datetime = timezoneobject.localize(datetimeobject)
def hour(self):
return self.datetime.hour
if __name__=='__main__':
epoch = time.time()
dt = DateTime('America/Los_Angeles',epoch)
print dt.datetime
dt = DateTime('America/New_York',epoch)
print dt.datetime
它打印:
9
9
我不知道这是怎么回事错在这里!使用pytz可以在Python中完成相同的功能吗? (我想它是!)如果是这样,请帮助!
由于
繁荣!谢谢!!! – mobiusinversion
当然,命名是关键,任何建议的Python风格? – mobiusinversion
最重要的是要保持一致,并与您合作的人员保持一致。大多数人(或多或少)符合[PEP8](http://www.python.org/dev/peps/pep-0008/)。对于类名,这意味着使用CamelCase,但是你会注意到,标准库本身打破了这个:'datetime.datetime','collections。defaultdict'等。 – unutbu