# Running python in virtual environment

**URL:** <https://discourse.nodered.org/t/running-python-in-virtual-environment/43744>\
**Category:** General\
**Created:** [6 April 2021 07:38 UTC](https://discourse.nodered.org/t/running-python-in-virtual-environment/43744 "2021-04-06T07:38:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anguslou](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/anguslou/32/9212_2.png) [@anguslou](https://discourse.nodered.org/u/anguslou)\
**Post date:** [6 April 2021 07:38 UTC](https://discourse.nodered.org/t/running-python-in-virtual-environment/43744/1 "2021-04-06T07:38:42Z")

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I have some python scripts that want to run by Node-Red with a few questions:

1. From Node-Red, how to pass A, B, C or D to specific functions in a Class?

Python script (eg)  
Class math  
def multiply(A, B):  
print (A \* B)

def sum(C, D):  
print (C+D)

1. How to run python in a virtual environment? I try to run by Pythonshell but seems it runs on Python 2.x? I need to run Python 3.x.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [5 June 2021 07:39 UTC](https://discourse.nodered.org/t/running-python-in-virtual-environment/43744/2 "2021-06-05T07:39:12Z")

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