Google Colab as alternative in Data Analysis Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of code using Google Colab environment variables

What will be the output of this code snippet when run in Google Colab?

Data Analysis Python

import os
print(os.environ.get('COLAB_GPU'))

A '0'

B None

C '1'

D Raises KeyError

💡 Hint

Google Colab sets some environment variables only when GPU is enabled.

The environment variable 'COLAB_GPU' is not set by default unless GPU is enabled in Colab settings, so os.environ.get returns None.

❓ data_output

intermediate

DataFrame output after reading CSV in Google Colab

Assuming you upload a CSV file named 'data.csv' with columns 'A' and 'B' and values [[1,2],[3,4]], what will be the output of this code in Google Colab?

Data Analysis Python

import pandas as pd
df = pd.read_csv('data.csv')
print(df)

A

   A  B
1  1  2
2  3  4

B Error: FileNotFoundError

C

   A  B
0  1  2
1  3  4

D

Empty DataFrame
Columns: [A, B]
Index: []

💡 Hint

In Google Colab, uploaded files are accessible in the current working directory.

After uploading 'data.csv', pandas reads it correctly and prints the DataFrame with default integer index starting at 0.

❓ visualization

advanced

Plot display behavior in Google Colab

Which option correctly describes what happens when you run this code in Google Colab?

Data Analysis Python

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.show()

A The code raises a RuntimeError about display backend.

B The plot opens in a new window outside the browser.

C No plot is displayed unless you save it to a file first.

D The plot is displayed inline below the code cell.

💡 Hint

Google Colab supports inline plotting by default.

Google Colab automatically renders matplotlib plots inline in the notebook output cells.

🔧 Debug

advanced

Fixing file path error in Google Colab

You run this code in Google Colab but get a FileNotFoundError. What is the most likely cause?

Data Analysis Python

with open('/content/myfile.txt', 'r') as f:
    data = f.read()
print(data)

A The file 'myfile.txt' is not uploaded or not in /content directory.

B The file path should be relative like 'myfile.txt' without /content prefix.

C Google Colab does not allow reading files from /content directory.

D The open function requires mode 'rb' for text files in Colab.

💡 Hint

Check if the file exists in the specified path in Colab.

In Google Colab, the /content directory is the root working directory, but the file must be uploaded or created there first.

🚀 Application

expert

Using Google Colab to run a machine learning model

You want to train a machine learning model on a large dataset using Google Colab. Which of these steps is NOT necessary or recommended?

A Save the trained model only locally on your computer without uploading or downloading.

B Use GPU acceleration by enabling it in Colab settings if available.

C Upload the dataset to Google Drive and mount it in Colab for access.

D Install required Python packages in each new Colab session before running code.

💡 Hint

Consider how Colab sessions work and where files persist.

Colab sessions are temporary; saving models only locally on your computer without uploading or downloading from Colab is not possible during the session.