| lambda_form | ::= | "lambda" [parameter_list]: expression | 
Lambda forms (lambda expressions) have the same syntactic position as
expressions.  They are a shorthand to create anonymous functions; the
expression lambda arguments: expression
yields a function object.  The unnamed object behaves like a function
object defined with
def name(arguments):
    return expression
See section 7.5 for the syntax of parameter lists. Note that functions created with lambda forms cannot contain statements.
See About this document... for information on suggesting changes.