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New posts in python-internals
Why is set.remove so slow here?
Sep 18, 2025
python
performance
set
python-internals
How Python's a, b = b, a works? [duplicate]
Sep 17, 2025
python
python-internals
Why is dict definition faster in Python 2.7 than in Python 3.x?
Sep 14, 2025
python
python-2.7
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dictionary
python-internals
Function call execution speed is faster than non-function call
Sep 14, 2025
python
python-3.x
function
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size of generator object in python
Sep 10, 2025
python
generator
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How can I force update the Python locals() dictionary of a different stack frame?
Sep 09, 2025
python
python-internals
inspect
stack-frame
locals
What cool hacks can be done using sys.settrace?
Sep 07, 2025
python
sys
python-internals
Why isn't the size of an empty list 0 bytes?
Sep 07, 2025
python
python-2.7
list
python-3.x
python-internals
CPython: Why does += for strings change the id of string variable
Sep 07, 2025
python
python-3.x
cpython
python-internals
Hash of integers in python
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python
hash
python-internals
yield from vs yield in for-loop
Sep 05, 2025
python
generator
yield
python-internals
yield-from
Why is integer divisions not optimised when compiling to bytecode?
Mar 22, 2023
python
bytecode
python-internals
Python: equality for Nan in a list?
Mar 19, 2023
python
cpython
python-internals
globals() vs locals() mutability
Mar 19, 2023
python
state
python-internals
mutability
Why round off of 0.500000 in python differs from 45.500000 using '%.0f'?
Mar 17, 2023
python
python-3.x
python-2.7
string-formatting
python-internals
Are simple hardcoded arithmetics cached/compiled away?
Mar 15, 2023
python
python-internals
How __future__ imports work under the hood
Mar 09, 2023
python
python-2.7
import
python-internals
compiler-directives
Fraction object doesn't have __int__ but int(Fraction(...)) still works
Feb 11, 2023
python
int
fractions
python-internals
How does Python's reversed() function work?
Jan 30, 2023
python
cpython
python-internals
In Python 3.12, why does 'Öl' take less memory than 'Ö'?
Sep 02, 2025
python
string
python-internals
python-3.12
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