Dear Gouri,
First, please try to run the command with python3, like python3 ./df05.py.
If this did not work, please be sure that you run the df05.py in the environment with python 3.7 installed. You can check it by entering python3 --version command. If you have Python 3.8.X version, then df05.py won't start.
I think I had a similar problem after I did steps before starting df05.py as the following (all taken from the lab instruction):
git clone https://github.com/GoogleCloudPlatform/data-science-on-gcp/
cd ~/data-science-on-gcp/04_streaming/simulate
virtualenv data-sci-env -p python3
source data-sci-env/bin/activate
pip install timezonefinder pytz
pip install apache-beam[gcp]
then my python version was 3.8.X for whatever reasons and I could not execute the command python ./df05.py.
Then what I did I deactivated the virtual environment, installed necessary python libraries and run df05.py again - as shown below:
deactivate
pip install timezonefinder pytz
pip install apache-beam[gcp]
python ./df05.py (here I cannot remember did I do python or python3 - please try both)
This was the solution in my case. Hopefully it will help you too.
Best,
MC
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