Heroku: FileNotFoundError [Errno 2] during file IO operations on deployment

I have successfully deployed a webapp to Heroku. However, my file IO operations are not happening because Heroku is unable to recognize the files in the folders.

My folder structure is:

- Project Folder
  - datafolder
    - otherdata.csv
  - main.py
  - userdata.csv

When I use df = pd.read_csv('userdata.csv') all works fine, because this is in the root directory as the main file and Heroku is able to find it, and allow read write operations.

However when I use df = pd.read_csv('datafolder\\otherdata.csv') Heroku logs display this error:

FileNotFoundError: [Errno 2] No such file or directory: 'datafolder\\otherdata.csv'

When I ran bash command using Heroku CLI, I can see the datafolder as well as csv file. Why is Heroku not able to recognise "datafolder" and the csv inside it?

CodePudding user response：

You are not using the path in correct way, you just have to use df = pd.read_csv('datafolder/otherdata.csv') and it should be working fine.