I Have read the notebook about how to open drive. I already did as instructed using:
from google.colab import drive
drive.mount(\'/content/drive\')
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I ran into a similar issue last night. As some of the previous responders posted there are concerns that influence your ability to read the file. These concerns are, one, making certain that your file is accessible via google drive from your Collab notebook and also, two, making certain that your file is in the correct format.
I will explain the steps and include a screen shot.
from google.colab import drive
drive.mount('/content/drive')
Run the cell. You are prompted to accept permissions and get a token to use to mount the drive. Grant the permissions and copy and paste the code into the text input. Hit enter.
Below is the example sans Permission tab because I previously granted permissions.