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python-internals

Why can tuples contain mutable items?

by IT Nursery

If a tuple is immutable then why can it contain mutable items? It is seemingly a contradiction that when a mutable item such … Read more

Tags immutability, list, python, python-internals, tuples

Finding the source code for built-in Python functions?

by IT Nursery

Is there a way to see how built in functions work in python? I don’t mean just how to use them, but also … Read more

Tags python, python-internals

Accessing class variables from a list comprehension in the class definition

by IT Nursery

How do you access other class variables from a list comprehension within the class definition? The following works in Python 2 but fails … Read more

Tags list-comprehension, python, python-3.x, python-internals, scope

How is Python’s List Implemented?

by IT Nursery

Is it a linked list, an array? I searched around and only found people guessing. My C knowledge isn’t good enough to look … Read more

Tags arrays, linked-list, list, python, python-internals

What is the global interpreter lock (GIL) in CPython?

by IT Nursery

What is a global interpreter lock and why is it an issue? A lot of noise has been made around removing the GIL … Read more

Tags gil, python, python-internals

How does asyncio actually work?

by IT Nursery

This question is motivated by my another question: How to await in cdef? There are tons of articles and blog posts on the … Read more

Tags python, python-3.x, python-asyncio, python-internals

Why is ‘x’ in (‘x’,) faster than ‘x’ == ‘x’?

by IT Nursery

>>> timeit.timeit(“‘x’ in (‘x’,)”) 0.04869917374131205 >>> timeit.timeit(“‘x’ == ‘x'”) 0.06144205736110564 Also works for tuples with multiple elements, both versions seem to grow linearly: … Read more

Tags performance, python, python-3.x, python-internals

Are tuples more efficient than lists in Python?

by IT Nursery

Is there any performance difference between tuples and lists when it comes to instantiation and retrieval of elements? 9 Answers 9

Tags list, performance, python, python-internals, tuples

Why are some float < integer comparisons four times slower than others?

by IT Nursery

When comparing floats to integers, some pairs of values take much longer to be evaluated than other values of a similar magnitude. For … Read more

Tags cpython, floating-point, performance, python, python-internals

time.sleep — sleeps thread or process?

by IT Nursery

In Python for *nix, does time.sleep() block the thread or the process? 7 Answers 7

Tags multithreading, python, python-internals, sleep, time
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