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title

Python Lambda

🎯 한 줄 통찰 (One-line insight)

A lambda is a small anonymous function limited to exactly one expression — its real power shows when a normal function returns a lambda closing over an outer argument, letting one function definition generate a whole family of specialized functions (like doubler/tripler). [S1]

🧠 핵심 개념 (Core concepts)

Lambda function — a small anonymous function; can take any number of arguments but only ONE expression. [S1]
Syntax — lambda arguments : expression. [S1]
Function-returning-lambda pattern — a normal def function can return a lambda that captures (closes over) the outer function's parameter, producing specialized functions. [S1]
Common pairing with map(), filter(), sorted() — lambdas are typically used as the throwaway function argument to these built-ins. [S1]

🧩 추출된 패턴 (Extracted patterns)

Lambda-as-function-factory — def myfunc(n): return lambda a: a * n demonstrates using a lambda's closure over n to generate mydoubler = myfunc(2) and mytripler = myfunc(3) from ONE function definition. [S1]
key= argument idiom — sorted(list, key=lambda x: ...) is the standard way to customize sort order without writing a named function. [S1]

📖 세부 내용 (Details)

Basic lambda: x = lambda a : a + 10; print(x(5)). [S1]
Multi-argument lambda: x = lambda a, b, c : a + b + c. [S1]
Function factory: def myfunc(n): return lambda a : a * n; mydoubler = myfunc(2); mytripler = myfunc(3). [S1]
With map(): doubled = list(map(lambda x: x * 2, numbers)). [S1]
With filter(): odd_numbers = list(filter(lambda x: x % 2 != 0, numbers)). [S1]
With sorted() key: sorted_students = sorted(students, key=lambda x: x[1]) (sort tuples by second element). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Sort Lists 챕터의 key= 커스텀 정렬이 여기서 람다로 완성된다. [S1]

💻 코드 패턴 (Code patterns)

Lambda as a sort key (Python):

students = [("Emil", 25), ("Tobias", 22), ("Linus", 28)]
sorted_students = sorted(students, key=lambda x: x[1])

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.90
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: Python Tutorial
관련 개념: Python Functions, Python Lists Sort, Python Lists Comprehension
참조 맥락: 짧은 익명 함수가 필요한 곳(map/filter/sorted의 key)에서 표준적으로 쓰인다.

📚 출처 (Sources)

[S1] W3Schools — Python Lambda — https://www.w3schools.com/python/python_lambda.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Python Lambda" page (Astra wiki-curation, P-Reinforce v3.1 format).

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