A lot of programming languages have been inspired by C. I can easily list C++, Java, and D; there's probably more (Wikipedia lists Perl, I think Perl is a very different sort of C - and Python and Ruby feel more like cleaned up Perl. I always thought of JavaScript as more like VisualBasic, which is more Pascal-ish - Pascal being a sibling of C, both derived from Algol). There is a pretty cool family tree of programming languages, which shows Python as independent of Perl. I'm not too familiar with Python...
C is a pretty good language. Developed in 1972, it served as a sort of "cross platform assembly language". It allowed UNIX to spread to many different computer systems and provided fertile ground for thousands of hackers.
The main problem with C is the lack of support for object inheritance (you can actually do object oriented programming, but it is kind of a pain). But to implement object inheritance, you must relax pointer conversion warnings (I'm not sure how strict modern C compilers are on pointer conversion, C is classically very relaxed).
The other problem is the lack of generic programming, sometimes called template programming. This allows one set of code to work with various underlying types. The most obvious application is in basic data structures and common algorithms (vector, map, sort). Sorting through void* and size is kind of a pain...
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