Google drive upload, read, update with Google Colab

pydrive.py

# Install the PyDrive wrapper & import libraries.
!pip install -U -q PyDrive
from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive
from google.colab import auth
from oauth2client.client import GoogleCredentials

# Authenticate and create the PyDrive client.
auth.authenticate_user()
gauth = GoogleAuth()
gauth.credentials = GoogleCredentials.get_application_default()
drive = GoogleDrive(gauth)

# Create & upload a new file.
f = drive.CreateFile({'title': 'Sample file.txt'})
f.SetContentString('Sample upload file content')  # or SetContentFile('im.png')
f.Upload()    # see f.get('id')

# Read a file
fid = drive.ListFile({'q':"title='Sample file.txt'"}).GetList()[0]['id']
f = drive.CreateFile({'id': fid})
text = f.GetContentString() # or f.GetContentFile('im.png') to save a local file

# Update a file
fid = drive.ListFile({'q':"title='Sample file.txt'"}).GetList()[0]['id']
f = drive.CreateFile({'id': fid})
f.SetContentString('Some newer content')
f.Upload()

replace.py

# combine upload new  & update
res = drive.ListFile({'q':"title='Sample file.txt'"}).GetList()
if res:
  fid = res[0]['id']
  f = drive.CreateFile({'id': fid})
else:
  f = drive.CreateFile({'title': 'Sample file.txt'})
f.SetContentString('Sample upload file content')
f.Upload()

upload_large.py

# from https://stackoverflow.com/a/49433955/6729010
from google.colab import auth
from googleapiclient.http import MediaFileUpload
from googleapiclient.discovery import build

auth.authenticate_user()  # click and fill

drive_service = build('drive', 'v3')

def save_file_to_drive(name, path):
    file_metadata = {
      'name': name,
      'mimeType': 'application/octet-stream'
     }

     media = MediaFileUpload(path, 
                    mimetype='application/octet-stream',
                    resumable=True)

     created = drive_service.files().create(body=file_metadata,
                                   media_body=media,
                                   fields='id').execute()

     print('File ID: {}'.format(created.get('id')))

     return created
# then use the function
save_file_to_drive(destination_name, path_to_file)