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Diffstat (limited to 'Doc/library/functions.rst')
| -rw-r--r-- | Doc/library/functions.rst | 45 |
1 files changed, 22 insertions, 23 deletions
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst index 7543fc4b10..a052e724c5 100644 --- a/Doc/library/functions.rst +++ b/Doc/library/functions.rst @@ -259,26 +259,24 @@ are always available. They are listed here in alphabetical order. interactive statement (in the latter case, expression statements that evaluate to something other than ``None`` will be printed). - The optional arguments *flags* and *dont_inherit* control which :ref:`future - statements <future>` affect the compilation of *source*. If neither - is present (or both are zero) the code is compiled with those future - statements that are in effect in the code that is calling :func:`compile`. If the - *flags* argument is given and *dont_inherit* is not (or is zero) then the - future statements specified by the *flags* argument are used in addition to - those that would be used anyway. If *dont_inherit* is a non-zero integer then - the *flags* argument is it -- the future statements in effect around the call - to compile are ignored. - - Future statements are specified by bits which can be bitwise ORed together to - specify multiple statements. The bitfield required to specify a given feature - can be found as the :attr:`~__future__._Feature.compiler_flag` attribute on - the :class:`~__future__._Feature` instance in the :mod:`__future__` module. - - The optional argument *flags* also controls whether the compiled source is - allowed to contain top-level ``await``, ``async for`` and ``async with``. - When the bit ``ast.PyCF_ALLOW_TOP_LEVEL_AWAIT`` is set, the return code - object has ``CO_COROUTINE`` set in ``co_code``, and can be interactively - executed via ``await eval(code_object)``. + The optional argument *flags* and *dont_inherit* controls which + :ref:`compiler options <ast-compiler-flags>` should be activated + and which :ref:`future features <future>` should be allowed. If neither + is present (or both are zero) the code is compiled with the same flags that + affect the code that is calling :func:`compile`. If the *flags* + argument is given and *dont_inherit* is not (or is zero) then the compiler + options and the future statements specified by the *flags* argument are used + in addition to those that would be used anyway. If *dont_inherit* is a + non-zero integer then the *flags* argument is it -- the flags (future + features and compiler options) in the surrounding code are ignored. + + Compiler options and future statements are specified by bits which can be + bitwise ORed together to specify multiple options. The bitfield required to + specify a given future feature can be found as the + :attr:`~__future__._Feature.compiler_flag` attribute on the + :class:`~__future__._Feature` instance in the :mod:`__future__` module. + :ref:`Compiler flags <ast-compiler-flags>` can be found in :mod:`ast` + module, with ``PyCF_`` prefix. The argument *optimize* specifies the optimization level of the compiler; the default value of ``-1`` selects the optimization level of the interpreter as @@ -506,6 +504,9 @@ are always available. They are listed here in alphabetical order. returns the current global and local dictionary, respectively, which may be useful to pass around for use by :func:`eval` or :func:`exec`. + If the given source is a string, then leading and trailing spaces and tabs + are stripped. + See :func:`ast.literal_eval` for a function that can safely evaluate strings with expressions containing only literals. @@ -1512,14 +1513,12 @@ are always available. They are listed here in alphabetical order. .. class:: slice(stop) slice(start, stop[, step]) - .. index:: single: Numerical Python - Return a :term:`slice` object representing the set of indices specified by ``range(start, stop, step)``. The *start* and *step* arguments default to ``None``. Slice objects have read-only data attributes :attr:`~slice.start`, :attr:`~slice.stop` and :attr:`~slice.step` which merely return the argument values (or their default). They have no other explicit functionality; - however they are used by Numerical Python and other third party extensions. + however they are used by NumPy and other third party packages. Slice objects are also generated when extended indexing syntax is used. For example: ``a[start:stop:step]`` or ``a[start:stop, i]``. See :func:`itertools.islice` for an alternate version that returns an iterator. |