Authorization fails for LakeBTC when calling private API

When trying to call fetch_balance() for with lakeBTC I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ccxt/lakebtc.py", line 72, in fetch_balance
    response = self.privatePostGetAccountInfo()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ccxt/lakebtc.py", line 199, in request
    response = self.fetch2(path, api, method, params, headers, body)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ccxt/base/exchange.py", line 258, in fetch2
    request = self.sign(path, api, method, params, headers, body)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ccxt/lakebtc.py", line 193, in sign
    'Authorization': "Basic " + self.apiKey + ':' + signature,
TypeError: must be str, not bytes

https://github.com/ccxt/ccxt/blob/4535a1d7fbae1a55c036bacba799cdcdc4deb51f/python/ccxt/lakebtc.py#L193

I think this is because both self.apiKey and signature are bytes and you are trying to concatenate them into a string. I think they need to be converted into strings. I think also, you need to create the string self.apiKey + ':' + signature and convert that into base64 before adding it 'Basic '.

[kroitor]

@LaurentIsRunning this is fixed in the most recent version of ccxt as well, thx for reporting! Let us know if you have any other difficulties with it.

[kroitor]

Ok, this is now fixed completely, let us know if you have any difficulties with it. Thx again!