Big difference being that most of the packages in Julia are written in Julia itself (unlike Python, where they're often written in some more performant language); so the aspiration is that you have to leave Julia even less frequently than you have to leave Python.
At the same time, calling into other languages (eg C) is super straightforward (disclaimer: last time I checked).
So like Python, you have SciPy Pandas etc. but don't have to leave Python when you need to do a bunch of text processing or whatever.