I learned Python after I already knew C, and I will forever be grateful for that.

I took an Operating Systems class in undergrad whose first assignment was to implement a simple web server in C, and it was fine. Later, I took the same prof's grad-level class and had to do basically the same assignment again, and all I could think was "wow, this is incredibly tedious: this whole thing would be literally two lines of Python." Python absolutely ruined my patience for writing C (or at least, for writing C socket code that has to manually juggle IPv4 and v6 struct addrinfos and whatnot).