Lean/QuantConnect Python 3.6 support by Alexandre Catarino

Alexandre Catarino INVESTOR

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We have a patch in the open-source project that changes the python version Lean/QuantConnect supports:
Upgrades python support to 3.6 from 2.7 #1526

Now Lean/QuantConnect supports Python 3.6.

We have to make minor corrections in our algorithms, so you might need to do it to yours too:

Leading zeros: SetStartDate(2017, 01, 01) to SetStartDate(2017, 1, 1);
filter is not a list: filter(lambda ... ) to list(filter(lambda ... ))
usage of SecuritiesChanged.None not allowed. We can use changes.Count > 0 instead

All third party libraries that were supported until now remain available.

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Alexandre Catarino

Accepted Answer

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Jing Wu

242.2k Pro ,

In Python2 dictionaries have the methods iterkeys(), itervalues() and iteritems() that return iterators instead of lists. In Python 3 the values() and items() return dictionary iterview object.

For example

# Python 2

for key, value in my_dict.iteritems():

# Python 3

for key, value in my_dict.items():

# Python 2

for value in my_dict.itervalues():

# Python 3

for value in my_dict.values():

Rodrigo Nader

69 Pro ,

How do I update it?

Huy Hoang

149 Pro ,

Sweet! I was checking a script by Jing yesterday and knew the Lab is now updated to 3.6 when it threw an error because of leading zero.

Rodrigo Nader the online platform is updated and you just need to fix the errors it produces for old script. If you're asking about local development environment then I guess the best way to do it is to do a full download of the project folder from github and rebuild the project files (?)

Rodrigo Nader

69 Pro ,

Thank’s Huy Hoang. But in research it appears to me that I’m using Python 2. Is that normal?

Huy Hoang

149 Pro ,

Rodrigo Nader the research environment is actually running on python 2 kernel. But the lab where we write algo is python 3.6. I also look forward to an update in Research too.

Jing Wu will we move to jupyter lab when version 1.0 is released? I really look forward to that. Playing with the lab is exciting.

Alexandre Catarino INVESTOR

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