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Data-Science-For-Beginners/translations/pcm/TROUBLESHOOTING.md

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Troubleshooting Guide

Dis guide dey show solution to common wahala wey fit happen wen you dey use Data Science for Beginners curriculum.

Table of Contents

Python and Jupyter Wahala

Python No Dey or Wrong Version

Wahala: python: command not found or wrong Python version

Solution:

# Check Python version
python --version
python3 --version

# If Python 3 is installed as 'python3', create an alias
# On macOS/Linux, add to ~/.bashrc or ~/.zshrc:
alias python=python3
alias pip=pip3

# Or use python3 explicitly
python3 -m pip install jupyter

Windows Solution:

  1. Install Python again from python.org
  2. Wen you dey install am, tick "Add Python to PATH"
  3. Restart your terminal/command prompt

Virtual Environment No Gree Activate

Wahala: Virtual environment no gree activate

Solution:

Windows:

# If you get execution policy error
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

# Then activate
venv\Scripts\activate

macOS/Linux:

# Ensure the activate script is executable
chmod +x venv/bin/activate

# Then activate
source venv/bin/activate

Check say e activate:

# Your prompt should show (venv)
# Check Python location
which python  # Should point to venv

Jupyter Kernel Wahala

Wahala: "Kernel no dey" or "Kernel dey die anyhow"

Solution:

# Reinstall kernel
python -m ipykernel install --user --name=datascience --display-name="Python (Data Science)"

# Or use the default kernel
python -m ipykernel install --user

# Restart Jupyter
jupyter notebook

Wahala: Wrong Python version for Jupyter

Solution:

# Install Jupyter in your virtual environment
source venv/bin/activate  # Activate first
pip install jupyter ipykernel

# Register the kernel
python -m ipykernel install --user --name=venv --display-name="Python (venv)"

# In Jupyter, select Kernel -> Change kernel -> Python (venv)

Package and Dependency Wahala

Import Errors

Wahala: ModuleNotFoundError: No module named 'pandas' (or other packages)

Solution:

# Ensure virtual environment is activated
source venv/bin/activate  # macOS/Linux
venv\Scripts\activate     # Windows

# Install missing package
pip install pandas

# Install all common packages
pip install jupyter pandas numpy matplotlib seaborn scikit-learn

# Verify installation
python -c "import pandas; print(pandas.__version__)"

Pip Installation Wahala

Wahala: pip install dey fail with permission wahala

Solution:

# Use --user flag
pip install --user package-name

# Or use virtual environment (recommended)
python -m venv venv
source venv/bin/activate
pip install package-name

Wahala: pip install dey fail with SSL certificate wahala

Solution:

# Update pip first
python -m pip install --upgrade pip

# Try installing with trusted host (temporary workaround)
pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org package-name

Package Version Wahala

Wahala: Package versions no dey compatible

Solution:

# Create fresh virtual environment
python -m venv venv-new
source venv-new/bin/activate  # or venv-new\Scripts\activate on Windows

# Install packages with specific versions if needed
pip install pandas==1.3.0
pip install numpy==1.21.0

# Or let pip resolve dependencies
pip install jupyter pandas numpy matplotlib seaborn scikit-learn

Jupyter Notebook Wahala

Jupyter No Gree Start

Wahala: jupyter notebook command no dey

Solution:

# Install Jupyter
pip install jupyter

# Or use python -m
python -m jupyter notebook

# Add to PATH if needed (macOS/Linux)
export PATH="$HOME/.local/bin:$PATH"

Notebook No Gree Load or Save

Wahala: "Notebook no fit load" or save dey fail

Solution:

  1. Check file permissions
# Make sure you have write permissions
ls -l notebook.ipynb
chmod 644 notebook.ipynb  # If needed
  1. Check say file no spoil
# Try opening in text editor to check JSON structure
# Copy content to new notebook if corrupted
  1. Clear Jupyter cache
jupyter notebook --clear-cache

Cell No Gree Run

Wahala: Cell dey stuck for "In [*]" or e dey take forever

Solution:

  1. Interrupt kernel: Click "Interrupt" button or press I, I
  2. Restart kernel: Kernel menu → Restart
  3. Check say no be infinite loop dey your code
  4. Clear output: Cell → All Output → Clear

Plots No Dey Show

Wahala: matplotlib plots no dey show for notebook

Solution:

# Add magic command at the top of notebook
%matplotlib inline

import matplotlib.pyplot as plt

# Create plot
plt.plot([1, 2, 3, 4])
plt.show()  # Make sure to call show()

Another way for interactive plots:

%matplotlib notebook
# Or
%matplotlib widget

Quiz Application Wahala

npm install Dey Fail

Wahala: Errors dey happen wen you run npm install

Solution:

# Clear npm cache
npm cache clean --force

# Remove node_modules and package-lock.json
rm -rf node_modules package-lock.json

# Reinstall
npm install

# If still failing, try with legacy peer deps
npm install --legacy-peer-deps

Quiz App No Gree Start

Wahala: npm run serve dey fail

Solution:

# Check Node.js version
node --version  # Should be 12.x or higher

# Reinstall dependencies
cd quiz-app
rm -rf node_modules package-lock.json
npm install

# Try different port
npm run serve -- --port 8081

Port Don Already Dey Use

Wahala: "Port 8080 don already dey use"

Solution:

# Find and kill process on port 8080
# macOS/Linux:
lsof -ti:8080 | xargs kill -9

# Windows:
netstat -ano | findstr :8080
taskkill /PID <PID> /F

# Or use a different port
npm run serve -- --port 8081

Quiz No Dey Load or Blank Page

Wahala: Quiz app dey load but na blank page e dey show

Solution:

  1. Check browser console for errors (F12)
  2. Clear browser cache and cookies
  3. Try another browser
  4. Make sure say JavaScript dey enabled
  5. Check say ad blockers no dey disturb
# Rebuild the app
npm run build
npm run serve

Git and GitHub Wahala

Git No Dey Recognize

Wahala: git: command not found

Solution:

Windows:

  • Install Git from git-scm.com
  • Restart terminal after installation

macOS:

Note: If Homebrew no dey your system, follow the instructions for https://brew.sh/ to install am first.

# Install via Homebrew
brew install git

# Or install Xcode Command Line Tools
xcode-select --install

Linux:

sudo apt-get install git  # Debian/Ubuntu
sudo dnf install git      # Fedora

Clone Dey Fail

Wahala: git clone dey fail with authentication wahala

Solution:

# Use HTTPS URL
git clone https://github.com/microsoft/Data-Science-For-Beginners.git

# If you have 2FA enabled on GitHub, use Personal Access Token
# Create token at: https://github.com/settings/tokens
# Use token as password when prompted

Permission Denied (publickey)

Wahala: SSH key authentication dey fail

Solution:

# Generate SSH key
ssh-keygen -t ed25519 -C "your_email@example.com"

# Add key to ssh-agent
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519

# Add public key to GitHub
# Copy key: cat ~/.ssh/id_ed25519.pub
# Add at: https://github.com/settings/keys

Docsify Documentation Wahala

Docsify Command No Dey

Wahala: docsify: command not found

Solution:

# Install globally
npm install -g docsify-cli

# If permission error on macOS/Linux
sudo npm install -g docsify-cli

# Verify installation
docsify --version

# If still not found, add npm global path
# Find npm global path
npm config get prefix

# Add to PATH (add to ~/.bashrc or ~/.zshrc)
export PATH="$PATH:/usr/local/bin"

Documentation No Dey Load

Wahala: Docsify dey serve but content no dey load

Solution:

# Ensure you're in the repository root
cd Data-Science-For-Beginners

# Check for index.html
ls index.html

# Serve with specific port
docsify serve --port 3000

# Check browser console for errors (F12)

Images No Dey Show

Wahala: Images dey show broken link icon

Solution:

  1. Check say image paths dey correct
  2. Make sure say image files dey inside the repository
  3. Clear browser cache
  4. Confirm say file extensions dey match (case-sensitive for some systems)

Data and File Wahala

File No Dey Errors

Wahala: FileNotFoundError wen you dey load data

Solution:

import os

# Check current working directory
print(os.getcwd())

# Use absolute path
data_path = os.path.join(os.getcwd(), 'data', 'filename.csv')
df = pd.read_csv(data_path)

# Or use relative path from notebook location
df = pd.read_csv('../data/filename.csv')

# Verify file exists
print(os.path.exists('data/filename.csv'))

CSV Reading Wahala

Wahala: Errors dey happen wen you dey read CSV files

Solution:

import pandas as pd

# Try different encodings
df = pd.read_csv('file.csv', encoding='utf-8')
# or
df = pd.read_csv('file.csv', encoding='latin-1')
# or
df = pd.read_csv('file.csv', encoding='ISO-8859-1')

# Handle missing values
df = pd.read_csv('file.csv', na_values=['NA', 'N/A', ''])

# Specify delimiter if not comma
df = pd.read_csv('file.csv', delimiter=';')

Memory Wahala with Big Datasets

Wahala: MemoryError wen you dey load big files

Solution:

# Read in chunks
chunk_size = 10000
chunks = []
for chunk in pd.read_csv('large_file.csv', chunksize=chunk_size):
    # Process chunk
    chunks.append(chunk)
df = pd.concat(chunks)

# Or read specific columns only
df = pd.read_csv('file.csv', usecols=['col1', 'col2'])

# Use more efficient data types
df = pd.read_csv('file.csv', dtype={'column_name': 'int32'})

Performance Wahala

Notebook Dey Slow

Wahala: Notebooks dey run very slow

Solution:

  1. Restart kernel and clear output

    • Kernel → Restart & Clear Output

  2. Close notebooks wey you no dey use

  3. Make your code better:

# Use vectorized operations instead of loops
# Bad:
result = []
for x in data:
    result.append(x * 2)

# Good:
result = data * 2  # NumPy/Pandas vectorization
  1. Use sample for big datasets:
# Work with sample during development
df_sample = df.sample(n=1000)  # or df.head(1000)

Browser Dey Crash

Wahala: Browser dey crash or e no dey respond

Solution:

  1. Close tabs wey you no dey use
  2. Clear browser cache
  3. Add browser memory (Chrome: chrome://settings/system)
  4. Use JupyterLab instead:
pip install jupyterlab
jupyter lab

How to Get Extra Help

Before You Ask for Help

  1. Check dis troubleshooting guide
  2. Search GitHub Issues
  3. Read INSTALLATION.md and USAGE.md
  4. Search the error message online

How to Ask for Help

Wen you dey create issue or dey ask for help, include:

  1. Operating System: Windows, macOS, or Linux (which distribution)
  2. Python Version: Run python --version
  3. Error Message: Copy the full error message
  4. Steps to Reproduce: Wetin you do before the wahala happen
  5. Wetin You Don Try: Solutions wey you don already try

Example:

**Operating System:** macOS 12.0
**Python Version:** 3.9.7
**Error Message:** ModuleNotFoundError: No module named 'pandas'
**Steps to Reproduce:**
1. Activated virtual environment
2. Started Jupyter notebook
3. Tried to import pandas

**What I've Tried:**
- Ran pip install pandas
- Restarted Jupyter

Community Resources

Related Documentation

Disclaimer:
Dis dokyument don use AI translation service Co-op Translator take translate am. Even though we dey try make sure say e correct, abeg sabi say automatic translation fit get mistake or no dey accurate well. Di original dokyument for im native language na di main correct source. For important information, e go beta make professional human translator check am. We no go fit take blame for any misunderstanding or wrong interpretation wey fit happen because you use dis translation.