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New posts in python-internals
Meaning of unittest.main() in Python unittest module
Nov 02, 2022
python
unit-testing
python-internals
Why are dict lookups always better than list lookups?
Aug 30, 2022
python
performance
optimization
big-o
python-internals
Python eval: is it still dangerous if I disable builtins and attribute access?
Aug 30, 2022
python
eval
python-internals
Are sets ordered like dicts in python3.6
Aug 29, 2022
python
set
python-3.6
cpython
python-internals
What exactly is contained within a obj.__closure__?
Aug 29, 2022
python
closures
python-internals
The `is` operator behaves unexpectedly with non-cached integers
Aug 29, 2022
python
python-3.x
integer
identity
python-internals
Why is this loop faster than a dictionary comprehension for creating a dictionary?
Aug 29, 2022
python
python-3.x
performance
python-internals
dictionary-comprehension
Why does `False is False is False` evaluate to `True`?
Aug 29, 2022
python
python-internals
How does Python's cmp_to_key function work?
Aug 29, 2022
python
algorithm
sorting
cmp
python-internals
Very strange behavior of operator 'is' with methods
Sep 12, 2022
python
python-2.7
methods
python-internals
Why does '() is ()' return True when '[] is []' and '{} is {}' return False?
Aug 28, 2022
python
python-3.x
tuples
identity
python-internals
Why is hardcoding this list slower than calculating it?
Aug 28, 2022
python
performance
python-3.x
python-internals
Where is Python's shutdown procedure setting module globals to None documented?
Nov 16, 2022
python
multithreading
python-2.7
python-internals
Why does creating a list from a list make it larger?
Aug 28, 2022
python
list
python-internals
Why is the size of 2⁶³ 36 bytes, but 2⁶³-1 is only 24 bytes?
Aug 28, 2022
python
python-2.7
cpython
python-internals
Python Compilation/Interpretation Process
Sep 16, 2022
python
compiler-construction
interpreter
python-internals
About the changing id of an immutable string
Aug 28, 2022
python
string
immutability
python-internals
Why is variable1 += variable2 much faster than variable1 = variable1 + variable2?
Dec 07, 2020
python
html
string
performance
python-internals
Two variables in Python have same id, but not lists or tuples
Sep 22, 2022
python
python-3.x
tuples
identity
python-internals
How references to variables are resolved in Python
Aug 27, 2022
python
variables
python-2.7
scope
python-internals
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