Using your Google Drive in Google Collab

# Mount the Google Drive (you will be asked to grant access)
from google.colab import drive
drive.mount('/GoogleDrive')

# Add the 'Colabs Notebooks' directory to the search path for importing
# (this only needs to be done once)
import sys
sys.path.append('/GoogleDrive/My Drive/Colab Notebooks/')

# Import the "linear_fit" function form the file "fiting.py" in the "Collab Notebooks" directory
from fitting import linear_fit

import numpy as np

# Read from the file "input.txt" in the "Colab Notebooks directory"
x, y, yerr = np.loadtxt('/GoogleDrive/My Drive/Colab Notebooks/input.txt', unpack=True)

# Write to the file "output.txt" in the "Colab Notebooks directory"
np.savetxt('/GoogleDrive/My Drive/Colab Notebooks/output.txt', x)