Builtin patching

import pydantic_linq uses forbiddenfruit to add every Enumerable operator to list, tuple, set and frozenset. Each patched method wraps the collection in an Enumerable and returns what that call returns.

import pydantic_linq

rows.where(lambda r: r.active).select(lambda r: r.id).to_list()

Name clashes

When a builtin already has a method with that name, the builtin wins:

Builtin method	Meaning kept	LINQ version
list.count(x), tuple.count(x)	occurrences of x	rows.as_enumerable().count()
list.index(x)	position of x	rows.as_enumerable().index()
list.reverse()	reverses in place	rows.as_enumerable().reverse()
list.append(x)	appends in place	rows.as_enumerable().append(x)
set.union(...)	Python union	s.as_enumerable().union(...)

Typing

Type checkers can't see methods added at runtime. Where you want static types, use Enumerable(rows). Every operator on it is fully typed.

Turning it off

pydantic_linq.uninstall()   # remove the patched methods
pydantic_linq.install()     # add them back (idempotent)

forbiddenfruit works on CPython only.