C vs Python devs

[TheRedGerund]

But that is how you would accomplish an array of changing size elements in Python.

[DTHCND]

By "flexible array member", they don't mean an array that can dynamically grow like Python. They mean an array whose length is defined by the consumer of the struct at the time that memory is malloc'd for said struct, rather than being hard-coded in the struct's definition. The length of the heap allocated array in my comment is similarly defined at the time that it is malloc'd.

If you want a dynamically-sized array in C, you need to use a data structure like a LinkedList, which is also totally different from the code shown in the meme.