Improving the get_address() function

With the get_address() method, we've continued adding logging messages to our script. This time, when catching URLError, we stored the Exception object as e to extract additional information from it for debugging:

059 def get_address(address):
060     """
061     The get_address function uses the blockchain.info Data API
062     to pull pull down account information and transactions for
063     address of interest
064     :param address: The Bitcoin Address to lookup
065     :return: The response of the url request
066     """

For URLError, we'll want to log the code, headers, and reason attributes. These attributes contain information, such as the HTML error code—for example, 404 for a web page that isn't found—and a description of the reason for the error code. We'll store this data to preserve the context surrounding the error:

067     url = 'https://blockchain.info/address/{}?format=json'
068     formatted_url = url.format(address)
069     try:
070         return urllib.request.urlopen(formatted_url)
071     except urllib.error.URLError as e:
072         logging.error('URL Error for {}'.format(formatted_url))
073         if hasattr(e, 'code') and hasattr(e, 'headers'):
074             logging.debug('{}: {}'.format(e.code, e.reason))
075             logging.debug('{}'.format(e.headers))
076         print('Received URL Error for {}'.format(formatted_url))
077         logging.info('Program exiting...')
078         sys.exit(1)