Python lambdas are little, anonymous functions, subject to a more restrictive but more concise syntax than regular Python functions.
Lambda expressions in Python and other programming languages have their roots in lambda calculus, a model of computation invented by Alonzo Church.
Python and other languages like Java, C#, and even C++ have had lambda functions added to their syntax, whereas languages like LISP or the ML family of languages, Haskell, OCaml, and F#, use lambdas as a core concept.
lambda x: x- The keyword: lambda
- A bound variable: x
- A body: x