scipy.weave.inline(code, arg_names=[], local_dict=None, global_dict=None, force=0, compiler='', verbose=0, support_code=None, headers=[], customize=None, type_converters=None, auto_downcast=1, newarr_converter=0, **kw)

Inline C/C++ code within Python scripts.

inline() compiles and executes C/C++ code on the fly. Variables in the local and global Python scope are also available in the C/C++ code. Values are passed to the C/C++ code by assignment much like variables passed are passed into a standard Python function. Values are returned from the C/C++ code through a special argument called return_val. Also, the contents of mutable objects can be changed within the C/C++ code and the changes remain after the C code exits and returns to Python.

inline has quite a few options as listed below. Also, the keyword arguments for distutils extension modules are accepted to specify extra information needed for compiling.

Parameters :

code : string

A string of valid C++ code. It should not specify a return statement. Instead it should assign results that need to be returned to Python in the return_val.

arg_names : [str], optional

A list of Python variable names that should be transferred from Python into the C/C++ code. It defaults to an empty string.

local_dict : dict, optional

If specified, it is a dictionary of values that should be used as the local scope for the C/C++ code. If local_dict is not specified the local dictionary of the calling function is used.

global_dict : dict, optional

If specified, it is a dictionary of values that should be used as the global scope for the C/C++ code. If global_dict is not specified, the global dictionary of the calling function is used.

force : {0, 1}, optional

If 1, the C++ code is compiled every time inline is called. This is really only useful for debugging, and probably only useful if your editing support_code a lot.

compiler : str, optional

The name of compiler to use when compiling. On windows, it understands ‘msvc’ and ‘gcc’ as well as all the compiler names understood by distutils. On Unix, it’ll only understand the values understood by distutils. (I should add ‘gcc’ though to this).

On windows, the compiler defaults to the Microsoft C++ compiler. If this isn’t available, it looks for mingw32 (the gcc compiler).

On Unix, it’ll probably use the same compiler that was used when compiling Python. Cygwin’s behavior should be similar.

verbose : {0,1,2}, optional

Speficies how much much information is printed during the compile phase of inlining code. 0 is silent (except on windows with msvc where it still prints some garbage). 1 informs you when compiling starts, finishes, and how long it took. 2 prints out the command lines for the compilation process and can be useful if your having problems getting code to work. Its handy for finding the name of the .cpp file if you need to examine it. verbose has no affect if the compilation isn’t necessary.

support_code : str, optional

A string of valid C++ code declaring extra code that might be needed by your compiled function. This could be declarations of functions, classes, or structures.

headers : [str], optional

A list of strings specifying header files to use when compiling the code. The list might look like ["<vector>","'my_header'"]. Note that the header strings need to be in a form than can be pasted at the end of a #include statement in the C++ code.

customize : base_info.custom_info, optional

An alternative way to specify support_code, headers, etc. needed by the function. See scipy.weave.base_info for more details. (not sure this’ll be used much).

type_converters : [type converters], optional

These guys are what convert Python data types to C/C++ data types. If you’d like to use a different set of type conversions than the default, specify them here. Look in the type conversions section of the main documentation for examples.

auto_downcast : {1,0}, optional

This only affects functions that have numpy arrays as input variables. Setting this to 1 will cause all floating point values to be cast as float instead of double if all the Numeric arrays are of type float. If even one of the arrays has type double or double complex, all variables maintain there standard types.

newarr_converter : int, optional


See also

Describes additional parameters.

Next topic


This Page