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nexedi
cython
Commits
fe6d84c0
Commit
fe6d84c0
authored
Apr 07, 2011
by
jasongrout
Committed by
Robert Bradshaw
Apr 12, 2011
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Various doc typo and wording fixes.
parent
32ea1429
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docs/src/reference/language_basics.rst
docs/src/reference/language_basics.rst
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docs/src/reference/language_basics.rst
View file @
fe6d84c0
...
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@@ -12,7 +12,7 @@ Language Basics
Cython File Types
=================
There are three file types in
c
ython:
There are three file types in
C
ython:
* Implementation files carry a ``.pyx`` suffix
* Definition files carry a ``.pxd`` suffix
...
...
@@ -41,7 +41,7 @@ What can it contain?
--------------------
* Any kind of C type declaration.
* ``extern`` C function or variable decarations.
* ``extern`` C function or variable dec
l
arations.
* Declarations for module implementations.
* The definition parts of **extension types**.
* All declarations of functions, etc., for an **external library**
...
...
@@ -69,12 +69,12 @@ cimport
* **cimport** does not need to be called in ``.pyx`` file for for ``.pxd`` file that has the
same name, as they are already in the same namespace.
* For cimport to find the stated definition file, the path to the file must be appended to the
``-I`` option of the **
c
ython compile command**.
``-I`` option of the **
C
ython compile command**.
compilation order
`````````````````
* When a ``.pyx`` file is to be compiled,
c
ython first checks to see if a corresponding ``.pxd`` file
* When a ``.pyx`` file is to be compiled,
C
ython first checks to see if a corresponding ``.pxd`` file
exits and processes it first.
...
...
@@ -92,7 +92,7 @@ How do I use it?
----------------
* Include the ``.pxi`` file with an ``include`` statement like: ``include "spamstuff.pxi``
* The ``include`` statement can appear anywhere in your
c
ython file and at any indentation level
* The ``include`` statement can appear anywhere in your
C
ython file and at any indentation level
* The code in the ``.pxi`` file needs to be rooted at the "zero" indentation level.
* The included code can itself contain other ``include`` statements.
...
...
@@ -154,14 +154,14 @@ The ``cdef`` statement is used to make C level declarations for:
soft = 2
runny = 3
:Funtions:
:Fun
c
tions:
::
cdef int eggs(unsigned long l, float f):
...
:Extens
t
ion Types:
:Extension Types:
::
...
...
@@ -242,7 +242,7 @@ Parameters
* The name ``object`` can be used to explicitly declare something as a Python Object.
* For sake of code clarity, it recom
en
ed to always use ``object`` explicitly in your code.
* For sake of code clarity, it recom
mend
ed to always use ``object`` explicitly in your code.
* This is also useful for cases where the name being declared would otherwise be taken for a type::
...
...
@@ -301,7 +301,7 @@ Keyword-only Arguments
* Shown above, the ``c``, ``d`` and ``e`` arguments can not be passed as positional arguments and must be passed as keyword arguments.
* Furthermore, ``c`` and ``e`` are required keyword arguments since they do not have a default value.
* If the parameter name after the ``"*"`` is omitted, the function will not accept any extra positional argum
r
ents::
* If the parameter name after the ``"*"`` is omitted, the function will not accept any extra positional arguments::
def g(a, b, *, c, d):
...
...
...
@@ -315,7 +315,7 @@ Automatic Type Conversion
* For basic numeric and string types, in most situations, when a Python object is used in the context of a C value and vice versa.
* The following table summari
s
es the conversion possibilities, assuming ``sizeof(int) == sizeof(long)``:
* The following table summari
z
es the conversion possibilities, assuming ``sizeof(int) == sizeof(long)``:
+----------------------------+--------------------+------------------+
| C types | From Python types | To Python types |
...
...
@@ -344,7 +344,7 @@ Automatic Type Conversion
* A Python string, passed to C context expecting a ``char*``, is only valid as long as the Python string exists.
* A reference to the Python string must be kept around for as long as the C string is needed.
* If this can't be guar
e
nteed, then make a copy of the C string.
* If this can't be guar
a
nteed, then make a copy of the C string.
* Cython may produce an error message: ``Obtaining char* from a temporary Python value`` and will not resume compiling in situations like this::
cdef char *s
...
...
@@ -363,7 +363,7 @@ Automatic Type Conversion
s = p
.. note::
**It is up to you to be aware of this, and not to depend on Cython's error message, as it is not guar
e
nteed to be generated for every situation.**
**It is up to you to be aware of this, and not to depend on Cython's error message, as it is not guar
a
nteed to be generated for every situation.**
Type Casting
...
...
@@ -379,7 +379,7 @@ Type Casting
cdef char *p, float *q
p = <char*>q
* If one of the types is a python object for ``<type>x``, Cython will try and do a coer
s
ion.
* If one of the types is a python object for ``<type>x``, Cython will try and do a coer
c
ion.
.. note:: Cython will not stop a casting where there is no conversion, but it will emit a warning.
...
...
@@ -391,11 +391,11 @@ Type Checking
* A cast like ``<MyExtensionType>x`` will cast x to type ``MyExtensionType`` without type checking at all.
* To have a cast type checked, use the syntax like: ``<MyExtens
t
ionType?>x``.
* To have a cast type checked, use the syntax like: ``<MyExtensionType?>x``.
* In this case, Cython will throw an error if ``"x"`` is not a (subclass) of ``MyExtens
tionClass
``
* In this case, Cython will throw an error if ``"x"`` is not a (subclass) of ``MyExtens
ionType
``
* Automatic type checking for extension types can be obtained
by
whenever ``isinstance()`` is used as the second parameter
* Automatic type checking for extension types can be obtained whenever ``isinstance()`` is used as the second parameter
Python Objects
...
...
@@ -463,7 +463,7 @@ Scope Rules
Built-in Constants
==================
Pre
-
defined Python built-in constants:
Predefined Python built-in constants:
* None
* True
...
...
@@ -511,13 +511,13 @@ Functions and Methods
=====================
* There are three types of function declarations in Cython as the sub-sections show below.
* Only "Python" functions can be called outside a Cython module from *Python interpret
t
ed code*.
* Only "Python" functions can be called outside a Cython module from *Python interpreted code*.
Callable from Python
=====================
* Are dec
a
lared with the ``def`` statement
* Are declared with the ``def`` statement
* Are called with Python objects
* Return Python objects
* See **Parameters** for special consideration
...
...
@@ -613,7 +613,7 @@ Error and Exception Handling
* Has no way of reporting a Python exception to it's caller.
* Will only print a warning message and the exception is ignored.
* Inorder to propagate exceptions like this to it's caller, you need to declare an exception value for it.
* In
order to propagate exceptions like this to it's caller, you need to declare an exception value for it.
* There are three forms of declaring an exception for a C compiled program.
* First::
...
...
@@ -631,7 +631,7 @@ Error and Exception Handling
* Used when a ``-1`` may possibly be returned and is not to be considered an error.
* The ``"?"`` tells Cython that ``-1`` only indicates a *possible* error.
* Now, each time ``-1`` is returned, Cython generates a call to ``PyErr_Occurrd`` to verify it is an actual error.
* Now, each time ``-1`` is returned, Cython generates a call to ``PyErr_Occurr
e
d`` to verify it is an actual error.
* Third::
...
...
@@ -713,7 +713,7 @@ Compile-Time Definitions
* Names defined by other ``DEF`` statements
* They can be combined using any of the Python expression syntax
* Cython provides the following pre
-
defined names
* Cython provides the following predefined names
* Corresponding to the values returned by ``os.uname()``
...
...
@@ -726,7 +726,7 @@ Compile-Time Definitions
* A name defined by ``DEF`` can appear anywhere an identifier can appear.
* Cython replaces the name with the literal value before compilation.
* The compile-time expression, in this case, must ev
e
luate to a Python value of ``int``, ``long``, ``float``, or ``str``::
* The compile-time expression, in this case, must ev
a
luate to a Python value of ``int``, ``long``, ``float``, or ``str``::
cdef int a1[ArraySize]
cdef int a2[OtherArraySize]
...
...
@@ -736,8 +736,8 @@ Compile-Time Definitions
Conditional Statements
=======================
* Simil
i
ar semantics of the C pre-processor
* The following statements can be used to conditinally include or exclude sections of code to compile.
* Similar semantics of the C pre-processor
* The following statements can be used to conditi
o
nally include or exclude sections of code to compile.
* ``IF``
* ``ELIF``
...
...
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