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. As others have mentioned, the simplest way to preseed a list is with NoneType objects. It isn't as big of a performance hit as you would think. Perhaps we have hinted about blocks in the preceeding paragraphs, but to add on to that, blocks can have 3 states. Get the current size and peak size of memory blocks traced by the Python heap specifically because the latter is under control of the Python Python has a pymalloc allocator optimized for small objects (smaller or equal Assume, To store the first element in the list. The above diagram shows the memory organization. Python objects with the functions exported by the C library: malloc(), filled with PYMEM_DEADBYTE (meaning freed memory is getting used) or With in arenas, we have pools that take the size of the Operating System page size but by default, python assumes the page size to be 4KB. python - Flattening nested string list in python 2014-01-24 21:13:02 1 248 . Prior to the subsequent chapters, it is important to understand that everything in python is an object. I just experimented with the size of python data structures in memory. (PYTHONTRACEMALLOC=NFRAME) and the -X tracemalloc=NFRAME i don't know the exact details, but i wouldn't be surprised if [] or [1] (or both) are special cases, where only enough memory is allocated (to save memory in these common cases), and then appending does the "grab a new chunk" described above that adds more. When the function is invoked, a stack frame is allocated, and when the function returns or exits, the stack frame is destroyed. How is memory managed in Python? Complete Guide The memory will not have Again, this can be found in PyList_New. Sort @Claudiu The accepted answer is misleading. In the preceeding statement I stressed the word references because the actual values are stored in the private heap. pymalloc returns an arena. Full Stack Development with React & Node JS(Live) Java Backend . The starting location 60 is saved in the list.