@mgorny “tuple” needs an “iteratable”, cannot do …

tuple( 1, 2 )

… ought to be renamed to some variation on “(as|to)_tuple”. (Similarly for “{list,dict,set}”.)

#Python #wart

@treyhunner
>>> a[:] = [*a, 47, 76] # 😦

IIRC found via StackOverflow about "subdir_list[:] = []", as "os.walk()" https://docs.python.org/3/library/os.html#os.walk lacks a variable to control recursion:

import os, random
parent_dir = '.'
recurse = random.randint( 0, 1 )
print( f'{recurse = } in {parent_dir}' )
for cur_dir, subdir_list, _ in os.walk( parent_dir ):
if subdir_list:
if not recurse:
subdir_list[:] = []
subdir_list.sort()
print( [ f'{cur_dir}/{s}' for s in subdir_list ] )
#Python #wart

... one of #TIMTOWTDI #workaround​s for the #Python #thorn_in_backside #wart
via (shallow) copy of the module-global🙃 (mutable) structure it is ...

from dataclasses import dataclass, field

default = [ 2 ]

@dataclass
class Initial_Mutable_Default:
# Look Ma, no "__post_init__()"!
attr :list[ int ] = field( default_factory = lambda: list( default ) )

print( Initial_Mutable_Default() )
🤷🏽‍♂️