计算ISO 8601的日期时间差

Question

我正在努力正确处理一些datetime值。我们有一个SaaS提供商，它用一个429的HTTP响应代码来实现他们的API，这意味着我们已经超过了他们的速率，所以我们不得不放弃。它们传入一个标题“X-RateLimit-Reset”，其值是请求重置时的ISO8601日期戳。我试着取这个值，然后取现在，计算我要等多长时间，以秒为单位。到目前为止，我已经构建了以下代码：

    elif ask.status_code == 429:
        print("API rate limit hit. Resting...")

        # ask.headers['X-RateLimit-Reset'] is passed back with a ISO8601 time stamp of when the api limit will be reset.
        # example: “2016-12-13T18:38:00Z”
        a = time.strptime(ask.headers['X-RateLimit-Reset'], '%Y-%m-%dT%H:%M:%SZ')
        a = time.mktime(a)

        print(ask.headers['X-RateLimit-Reset'])

        # I don't get this...
        myTZ = datetime.tzinfo
        myTZ.timezone.utc

        # Calculate the offset taking into account daylight saving time
        b = datetime.utcnow().replace(tzinfo=myTZ.timezone.utc).replace(microsecond=0).isoformat()
        b = time.strptime(b, '%Y-%m-%dT%H:%M:%S%z')
        b = time.mktime(b)

        # Time in seconds to wait and retry
        apiReset = (b-a)+1

        print("Sleeping {} seconds".format(apiReset))
        time.sleep(apiReset)

        return self.CallAPI(uri, method, data, timeout)

它只是没有做我需要它做的。我已经排除了一些例外，但现在我要谈一个：

API rate limit hit. Resting...
2018-12-18T00:07:54Z
Traceback (most recent call last):
  File "Development/evident.io/mainbody.py", line 22, in <module>
    EvidentIO.ListSubORGs()
  File "/Users/i864248/OneDrive - SAP         SE/Development/evident.io/evidentio.py", line 112, in ListSubORGs
    return self.APICallHandler('/api/v2/sub_organizations')
  File "/Users/i864248/OneDrive - SAP     SE/Development/evident.io/evidentio.py", line 297, in APICallHandler
    response = self.CallAPI(uri, method, data, timeout)
  File "/Users/i864248/OneDrive - SAP SE/Development/evident.io/evidentio.py", line 407, in CallAPI
    myTZ.timezone.utc
AttributeError: 'getset_descriptor' object has no attribute 'timezone'

有人能帮我吗？也许我一开始就做得不对

Answer 1

好的，当然，在发布这篇文章后不久，我找到了一个不错的解决方案。使用其他地方的一些示例，我将代码简化为：

a = datetime.strptime(ask.headers['X-RateLimit-Reset'], '%Y-%m-%dT%H:%M:%SZ')
timestamp = (a - datetime(1970, 1, 1)).total_seconds()

ts = time.time()
timeDiff = (timestamp - ts)

print("Sleeping for {} seconds".format(timeDiff))
time.sleep(timeDiff + 1) 
print("Continuing")
return self.CallAPI(uri, method, data, timeout)

这似乎很管用