Which Python library should I learn first, NumPy or Pandas?

This strongly depends on the type of application you are working on, or plan to work on. Both libraries are awesome and there is a some overlap in functionality. But their differ in the design and application for what they are meant to be used. read more

Numpy is required by pandas (and by virtually all numerical tools for Python). Scipy is not strictly required for pandas but is listed as an "optional dependency". I wouldn't say that pandas is an alternative to Numpy and/or Scipy. Rather, it's an extra tool that provides a more streamlined way of working with numerical and tabular data in Python. read more