those tests are passing. i see no problem here... npm run-tests only tests the exchanges (files which would be edited and need to run during CI), whereas mostly the ccxt dev team will check that the datetime functions and other essential parts of the lib are working.

well datetime-functions file was one example ...
but some of the other files are not working correctly within the docker-container:

root@ff35d93a20b3:/ccxt# python3 python/test/test_get_zeroex_order_hash_v2.py 
Traceback (most recent call last):
  File "python/test/test_get_zeroex_order_hash_v2.py", line 36, in <module>
    assert(exchange.getZeroExOrderHashV2(example_order) == expected_order_hash)
  File "/usr/local/lib/python3.6/dist-packages/ccxt-1.18.1061-py3.6.egg/ccxt/base/exchange.py", line 1889, in getZeroExOrderHashV2
    domain_struct_hash = self.web3.sha3(
AttributeError: 'NoneType' object has no attribute 'sha3'

This above one seems to be based on a missed installation dependency, but the next one... ?

root@ff35d93a20b3:/ccxt# python3 python/test/test_calculate_fee.py 
Traceback (most recent call last):
  File "python/test/test_calculate_fee.py", line 41, in <module>
    exchange.calculate_fee(market['symbol'], 'limit', 'sell', amount, price, 'taker', {})
  File "/usr/local/lib/python3.6/dist-packages/ccxt-1.18.1061-py3.6.egg/ccxt/base/exchange.py", line 1671, in calculate_fee
    cost = float(self.cost_to_precision(symbol, amount * price))
  File "/usr/local/lib/python3.6/dist-packages/ccxt-1.18.1061-py3.6.egg/ccxt/base/exchange.py", line 1150, in cost_to_precision
    return self.decimal_to_precision(cost, ROUND, self.markets[symbol]['precision']['price'], self.precisionMode)
KeyError: 'price'

does it hurt to run them in CI ... ? they don't take that long ... ?

This above one seems to be based on a missed installation dependency

That is correct, if you are going to test all exchanges you will also need web3, however, we don't install it by default, it's a responsibility of the user.

but the next one... ?

The next one is not finished yet: https://github.com/ccxt/ccxt/blob/master/python/test/test_calculate_fee.py#L3