A python developer is someone who specializes in using python as their primary programming language to create, maintain, and improve software products or systems. Depending on the project and company, a python developer may have various roles and responsibilities, such as developing web applications or websites with Django, Flask, or Pyramid; writing scripts or modules for data processing, analysis, or visualization with pandas, numpy, or matplotlib; building machine learning models or AI systems with scikit-learn, TensorFlow, or PyTorch; automating tasks or workflows with Selenium, Ansible, or Airflow; testing, debugging, and optimizing code with pytest, pylint, or profiler; and collaborating with other developers, engineers, or stakeholders using Git, GitHub, or Slack.