Python Developer is required in multiple fields such as software development, web development, Data Science, Machine Learning, and Deep Learning fields.
For Web development, Python developer should know Python frameworks: Django/ Flask, HTML, CSS, JavaScript, System Design: MVT and MCT, REST API, and ORM.
For Data Science, Python developer should know Math Fundamentals, Statistics, Data Processing and Mining, Data Analysis, SQL, Data Visualization
For Machine Learning, Python developer should know ML algorithms and libraries, Probability, Statistics, TensorFlow, Scikit Learn, Neural Networks
For Deep Learning, Python developer should know Neural Network Architecture, Language processing, video processing, audio processing, and building deep learning models.
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I recommend watching this video on Python Developer skills for more details: