Between SageMath, Numpy, scikit-learn, Pandas, Folium etc. Python can probably match Mathematica feature for feature and even beat it in some cutting edge research areas.
However Mathematica makes it a lot easier to get started if you don't know how to program. Just start Mathematica, enter the equation like it looks on the page in your math book using the equation editor GUI, click solve and you're done. Also since everything is built in you don't have to worry about working out which package implements Moving Median or Facial Recognition.
Mathematica also comes with a bunch of real time data sources which are really fun to play with. Want to plot Germany's GDP vs Natual Gas prices or Gold prices vs global average temperatures? The datasets are there and ready to be explored.