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LEAN is the open source algorithmic trading engine powering QuantConnect. Founded in 2013 LEAN has been built by a global community of 80+ engineers and powers more than a dozen hedge funds today.

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Py
7.3k
Error when trying to access from a dictionary 2 comments, last comment by Nico Xenox,
Py
1.7k
Why can I maximum download the same (Dropbox) file 100 times in backtests? Does paper/live trading have limits on downloading the same file? 2 comments, last comment by Louis Szeto,
Py
3.8k
OutOfMemoryException error 1 comment by Nico Xenox,
Py
7.6k
How does LEAN handle options splits in real-time? 2 comments, last comment by Yuri Lopukhov,
Py
6.7k
Add Data vs Add Index why does it yield different results? 2 comments, last comment by Louis Szeto,
Py
61
Question about 'SetWarmUp' 2 comments, last comment by Derek Melchin,
Py
7.6k
How can I get number of stocks in options contract? 2 comments, last comment by Yuri Lopukhov,
C#
248
Unable To Acquire EURUSD Price 1 comment by Louis Szeto,
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2.3k
Seeking guidance on why this algorithm will not properly run. 1 comment by Nico Xenox,
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2k
Algorithms discrepancy is leaving me CLUELESS 2 comments, last comment by Jesse Fleming,
Py
1.1k
How To Trade all available cash 9 comments, last comment by Kenneth Lamers,
Py
95
Bootcamp 101 lesson 7, task 5 Preparing Indicators with History 1 comment by Louis Szeto,
Py
541
CustomBarHandler/Consolidators error 2 comments, last comment by Nico Xenox,
Py
203
Consolidators on arbitrary N minutes doesn't seem 5 comments, last comment by Derek Melchin,
Py
165.6k
[Share] A faster alternative to calling Self.History (2x, 5x, 10x) 5 comments, last comment by .ekz.,
C#
STAFF
Extended market hours support for futures 3 comments, last comment by Jhonathan Abreu,
Py
541
Orders executed at the end of the next day. What is the reason? 9 comments, last comment by Sebul,
Py
2k
Seeking Guidance on why this algorithm is not working! 2 comments, last comment by Jesse Fleming,
Py
256
Unable to add Futures Symbol to Rollingwindow 1 comment by Louis Szeto,
Py
2.4k
Custom data universe : trouble with Alpha Module 1 comment by Louis Szeto,
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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.

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