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New posts in python-internals
What is under the hood of x = 'y' 'z' in Python?
Feb 21, 2022
python
string
syntax
concatenation
python-internals
Is there a difference between [] and list() when using id()?
Sep 12, 2022
python
list
python-internals
Are list comprehensions syntactic sugar for `list(generator expression)` in Python 3?
Aug 31, 2022
python
python-3.x
list-comprehension
python-internals
generator-expression
Why are reversed and sorted of different types in Python?
Aug 31, 2022
python
types
python-internals
Is there anything faster than dict()?
Sep 12, 2022
python
python-3.x
numpy
dictionary
python-internals
Why were literal formatted strings (f-strings) so slow in Python 3.6 alpha? (now fixed in 3.6 stable)
Aug 30, 2022
python
performance
python-internals
python-3.6
f-string
How does swapping of members in tuples (a,b)=(b,a) work internally?
Aug 30, 2022
python
tuples
python-internals
iterable-unpacking
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
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