In college I used to tutor students in computer science. Mid-way through my college career my school switched the curriculum to teach Python instead of Java. I found that the students who took Python lacked what I considered a basic appreciation for and understanding of how the language actually ‘does’ something.

For instance, when you only need to write two curly braces to create a “dictionary” (of course behind the scenes this is a hash table) many of the nuances of that data structure are hidden from you. You have no idea that accesses are O(1) amortized but worst case are O(n). Even if you do, maybe you don’t understand why. You have no idea that there is reallocation and collision handling code working behind the scenes constantly.

Python also lacks a number of nuances I consider it important to be aware of. You live your entire Python life blissfully unaware that everything is a pointer, and the impact that has on performance. You never come across static typing, or that it is possible to check your code for some level of syntactic correctness before it runs (i.e. Python is interpreted rather than compiled).

I think from this standpoint, it is worth learning a language like C to gain an appreciation for how truly complex a lot of the things Python allows you to do, are. I think that anything which helps you better understand what it is you are doing, how you are doing it, and why you are doing it that way, will make you better at doing that thing.