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And it would be actually a sensible thing to write a C compiler in Python. C is not a very nice language to write complicated programs in --- and compilers don't need C's speed. They just need to produce (correct and) fast code, but they do not need to run bleedingly fast.

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Um, what? You want your compilers to be very fast, otherwise you end up wasting a lot of developer time (and thus money) waiting for compilation.

Especially for C. It just takes too long to compile.

C++ is far, far worse.

You got that backwards. For most development, you want a fast compiler but you don't care so much about the runtime speed, so long as its correct. Also, the more optimizing the compiler, the higher the probability that you'll hit bugs, affecting correctness.

Then use a C-interpreter for development.

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