which has a completely redesigned interpreter loop that avoids the C stack.
-Why can't lambda forms contain statements?
-------------------------------------------
+Why can't lambda expressions contain statements?
+------------------------------------------------
-Python lambda forms cannot contain statements because Python's syntactic
+Python lambda expressions cannot contain statements because Python's syntactic
framework can't handle statements nested inside expressions. However, in
Python, this is not a serious problem. Unlike lambda forms in other languages,
where they add functionality, Python lambdas are only a shorthand notation if
you're too lazy to define a function.
Functions are already first class objects in Python, and can be declared in a
-local scope. Therefore the only advantage of using a lambda form instead of a
+local scope. Therefore the only advantage of using a lambda instead of a
locally-defined function is that you don't need to invent a name for the
function -- but that's just a local variable to which the function object (which
-is exactly the same type of object that a lambda form yields) is assigned!
+is exactly the same type of object that a lambda expression yields) is assigned!
Can Python be compiled to machine code, C or some other language?
by the parameters' names in the :attr:`__annotations__` attribute of the
function object.
-.. index:: pair: lambda; form
+.. index:: pair: lambda; expression
It is also possible to create anonymous functions (functions not bound to a
-name), for immediate use in expressions. This uses lambda forms, described in
-section :ref:`lambda`. Note that the lambda form is merely a shorthand for a
+name), for immediate use in expressions. This uses lambda expressions, described in
+section :ref:`lambda`. Note that the lambda expression is merely a shorthand for a
simplified function definition; a function defined in a ":keyword:`def`"
statement can be passed around or assigned to another name just like a function
-defined by a lambda form. The ":keyword:`def`" form is actually more powerful
+defined by a lambda expression. The ":keyword:`def`" form is actually more powerful
since it allows the execution of multiple statements and annotations.
-**Programmer's note:** Functions are first-class objects. A "``def``" form
+**Programmer's note:** Functions are first-class objects. A "``def``" statement
executed inside a function definition defines a local function that can be
returned or passed around. Free variables used in the nested function can
access the local variables of the function containing the def. See section
.. productionlist::
conditional_expression: `or_test` ["if" `or_test` "else" `expression`]
- expression: `conditional_expression` | `lambda_form`
- expression_nocond: `or_test` | `lambda_form_nocond`
+ expression: `conditional_expression` | `lambda_expr`
+ expression_nocond: `or_test` | `lambda_expr_nocond`
Conditional expressions (sometimes called a "ternary operator") have the lowest
priority of all Python operations.
pair: anonymous; function
.. productionlist::
- lambda_form: "lambda" [`parameter_list`]: `expression`
- lambda_form_nocond: "lambda" [`parameter_list`]: `expression_nocond`
+ lambda_expr: "lambda" [`parameter_list`]: `expression`
+ lambda_expr_nocond: "lambda" [`parameter_list`]: `expression_nocond`
-Lambda forms (lambda expressions) have the same syntactic position as
+Lambda expressions (sometimes called lambda forms) 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 ::
return expression
See section :ref:`function` for the syntax of parameter lists. Note that
-functions created with lambda forms cannot contain statements or annotations.
+functions created with lambda expressions cannot contain statements or
+annotations.
.. _exprlists:
Small anonymous functions can be created with the :keyword:`lambda` keyword.
This function returns the sum of its two arguments: ``lambda a, b: a+b``.
-Lambda forms can be used wherever function objects are required. They are
+Lambda functions can be used wherever function objects are required. They are
syntactically restricted to a single expression. Semantically, they are just
syntactic sugar for a normal function definition. Like nested function
definitions, lambda functions can reference variables from the containing