Top 100 Questions Junior Python Developers Ask

Syntax and Debugging

• How to fix a "NoneType has no attribute" error
• How to fix a loop not iterating as expected
• How to resolve an "index out of range" error
• How to understand "unexpected indent" in Python
• How to debug a function that returns nothing
• How to resolve a KeyError in my dictionary
• How to handle a TypeError in my code
• How to fix an "attribute not found" error
• How to trace a SyntaxError to its source
• How to prevent a variable from resetting in a loop

Working with Data Structures

• How to merge two lists in Python
• How to filter a list based on a condition
• How to sort a list of dictionaries by a key
• How to update a value in a nested dictionary
• How to check if a key exists in a dictionary
• How to convert a list of strings to integers
• How to remove duplicates from a list without changing order
• How to split a list into chunks
• How to combine two dictionaries
• How to flatten a list of lists

Functions and Logic

• How to pass a list to a function
• How to fix a function not updating my variable
• How to return multiple values from a function
• How to use recursion in Python
• How to avoid a maximum recursion depth error
• How to pass a function as an argument
• How to handle optional arguments effectively
• How to reuse a function across files
• How to time a function's execution
• How to validate function inputs

File and Data Handling

• How to read a CSV file in Python
• How to write data to a CSV file
• How to parse a JSON file
• How to save a dictionary to a JSON file
• How to read a large text file efficiently
• How to handle file not found errors
• How to append data to an existing file
• How to process an Excel file in Python
• How to download a file from a URL
• How to work with binary files in Python

Libraries and APIs

• How to install a specific version of a library with pip
• How to use the requests library to make an API call
• How to handle API rate limits in Python
• How to parse JSON from an API response
• How to use Pandas to clean data
• How to create a DataFrame from a list
• How to plot data with Matplotlib
• How to use NumPy for array operations
• How to handle missing dependencies in my project
• How to use the os module to manage files

Project Workflow

• How to structure a Python project
• How to use a virtual environment for my project
• How to run my Python script on another computer
• How to manage project dependencies with requirements.txt
• How to use Git to commit my Python code
• How to understand relative vs absolute imports
• How to organize my Python modules
• How to set up a .gitignore for Python
• How to run unit tests in Python
• How to use pytest for testing my code

Performance and Optimization

• How to speed up a slow Python script
• How to profile my Python code
• How to choose between a list comprehension and a loop
• How to avoid memory errors with large datasets
• How to use generators in Python
• How to parallelize tasks in Python
• How to use the multiprocessing module
• How to cache function results in Python
• How to optimize string operations
• How to handle large lists efficiently

Web Development

• How to create a basic Flask app
• How to handle POST requests in Flask
• How to connect Flask to a database
• How to use Django models
• How to debug a 500 error in my web app
• How to serve static files in Flask
• How to scrape a website with BeautifulSoup
• How to use Selenium to automate browser tasks
• How to handle CORS in Python
• How to send an HTTP request with headers

Error Handling and Logging

• How to log errors to a file
• How to use the logging module
• How to catch all exceptions in Python
• How to raise a custom exception
• How to retry a failed operation
• How to handle timeouts in Python
• How to validate user input
• How to sanitize data in Python
• How to deal with Unicode errors
• How to debug a crashed script

Miscellaneous Project Challenges

• How to connect to a SQL database in Python
• How to schedule a Python script to run automatically
• How to send an email with Python
• How to work with dates and times in Python
• How to convert a script to an executable
• How to handle environment variables in Python
• How to encrypt data in Python
• How to generate a random string
• How to check if my code follows PEP 8
• How to collaborate on a Python project with a team