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I went to install a stock module in  my system but every time it gives me error like

yaml.constructor.ConstructorError: could not determine a constructor for the tag '!python'
  in "<byte string>", line 2, column 3:
      !python {model: ir.model.data, i ...
^

I check the code of the yml file it is same as the in odoo github file I was nothing to change in code.
I not understand way it is gives error.

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update the code to the latest commit and then try again

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I will pull latest code from git

check the pyyaml version, use the version less than 4 and see

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pip3 instal PyYAML==3.13

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Mostafa Thanks It is working now.

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as mustafa said, For Odoo 10 :

pip install pyyaml==3.13

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Thanks Mustofa,

It's working on odoo 11.

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