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The following error keeps appearing whenever I try to do 

dev_appserver.py app.yaml

File "/Users/monikap/Desktop/test-dir/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 95, in assert sys.version_info[0] == 2 AssertionError

I have Python version 3.7 installed on my Mac

Shiny
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Monika
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2 Answers2

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The development server still needs python 2 installed, even for python 3 apps, see Python 3.7 Local Development Server Options for new app engine apps

Dan Cornilescu
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Python3 now has GA support on Cloud SDK.

I think you need to update your Cloud SDK with gcloud components update.

Emil Gi
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