ModuleNotFoundError: No module named 'yaml' error

Question

I have a centos7 machine with python-2.7.5 installed as a default python. For my work, I need 3.x version of python on the same machine, so I have installed python-3.6.8 and created a soft link where /usr/bin/python point to /usr/bin/python3 with following command:

sudo ln -fs /usr/bin/python3 /usr/bin/python

Now, for a sample python script, let's say: test.py, I am getting ModuleNotFoundError: No module named 'yaml' error when I am trying to import yaml in it.

test.py script is as below:

#!/usr/bin/python3

"""
Sample python script to import yaml.
"""

import yaml

print("Hello! Could you please help me resolve this?")

And the error is as below:

[cloud-user@xx.xx.xx.xx]$python test.py
Traceback (most recent call last):
  File "test.py", line 6, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

I saw a couple of queries raised on stackoverflow and on github, like this , this and this , but do not see any response that has resolved this issue.

As suggested on the links above, I have installed pyyaml using below command:

sudo python3 -m pip install pyyaml and sudo pip3 install pyyaml but I am still continue to get ModuleNotFoundError error.

Could anyone please help me resolve this issue?

Thanks in advance,

Akshat Sharma

Answer 1

Such issues occur when there are multiple distribution of python installed in your system.

Just run: pip3 list command and see whether you are able to see the package in the list. If not, you are not installing the PyYaml package at the correct location.

PS: also sometimes for normal user python is at different location and for sudo user, it is at different location. Check running the command without giving sudo.