Improvement xls decoding

[RamParameswaran]

This PR applies two patches to fix failing tests:

1. testGetSecurityInfoLive --> previously used ticker symbol ("CBAPC") has been suspended on the ASX. Replaced with "CBAPD"
   Original error:

ERROR: testGetSecurityInfoLive (pyasx.tests.data.securities.SecuritiesTest)
Unit test for pyasx.data.securities.get_security_info()
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ram/Dropbox/My Projects/pyasx/pyasx/tests/data/securities.py", line 210, in testGetSecurityInfoLive
    security = pyasx.data.securities.get_security_info('CBAPC')
  File "/home/ram/Dropbox/My Projects/pyasx/pyasx/data/securities.py", line 166, in get_security_info
    "Unknown security ticker %s" % ticker
pyasx.data.UnknownTickerException: Unknown security ticker CBAPC

2. testGetListedSecuritiesLive --> error decoding the XLS file for listed securities. In this PR, I'm using Pandas to read the excel file. This simplifies the code. But it adds two dependencies: pandas and xlrd
   Original error:

ERROR: testGetListedSecuritiesLive (pyasx.tests.data.securities.SecuritiesTest)
Unit test for pyasx.data.securities.get_listed_securities()
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ram/Dropbox/My Projects/pyasx/pyasx/tests/data/securities.py", line 139, in testGetListedSecuritiesLive
    securities = pyasx.data.securities.get_listed_securities()
  File "/home/ram/Dropbox/My Projects/pyasx/pyasx/data/securities.py", line 48, in get_listed_securities
    temp_stream.write(block.decode('unicode_escape'))
UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in position 809-810: malformed \N character escape

Great library 👍

[ShahinNamin]

get_listed_securities throws an error, please investigate
The error is thrown on line 48 of securities.py and is
"UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in position 809-810: malformed \N character escape"

[RamParameswaran]

@ShahinNamin that's the original error which I addressed in point number 2 in my PR comment (above).

I re-ran the tests on my fork to be certain. I get all tests passing. Can you please confirm if there's a discrepancy?

/home/ram/Desktop/pyasx-Improvement-xls_decoding/pyasx_test/lib/python3.6/site-packages/requests/__init__.py:80: RequestsDependencyWarning: urllib3 (1.24.1) or chardet (3.0.4) doesn't match a supported version!
  RequestsDependencyWarning)
testGetCompanyAnnouncementsLive (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetCompanyAnnouncementsMocked (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetCompanyInfoLive (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetCompanyInfoMocked (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetListedCompaniesLive (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetListedCompaniesMocked (pyasx.tests.data.companies.CompaniesTest) ... ok
testGetListedSecuritiesLive (pyasx.tests.data.securities.SecuritiesTest) ... ok
testGetListedSecuritiesMocked (pyasx.tests.data.securities.SecuritiesTest) ... ok
testGetSecurityInfoLive (pyasx.tests.data.securities.SecuritiesTest) ... ok
testGetSecurityInfoMocked (pyasx.tests.data.securities.SecuritiesTest) ... ok

----------------------------------------------------------------------
Ran 10 tests in 4.116s

OK

[ShahinNamin]

My bad, the error is in the master branch. If your pull request is approved, it will be resolved. Thanks @RamParameswaran

[RichardScottOZ]

Thanks for this.