58 lines
2.9 KiB
Factor
58 lines
2.9 KiB
Factor
USING: alien destructors help.markup help.syntax python python.throwing
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quotations ;
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IN: python
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HELP: py-initialize
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{ $description "Initializes the python binding. This word must be called before any other words in the api can be used" } ;
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HELP: py-finalize
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{ $description "Finalizes the python binding. After this word is called the api must not be used anymore." } ;
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HELP: >py
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{ $values { "obj" "a factor object" } { "py-obj" "a python object" } }
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{ $description "Converts a factor objects to its most fitting python representation." }
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{ $examples
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{ $example
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"USING: arrays prettyprint python sequences ;"
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"10 iota >array >py py> ."
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"{ 0 1 2 3 4 5 6 7 8 9 }"
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}
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}
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{ $see-also py> } ;
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HELP: quot>py-callback
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{ $values { "quot" { $quotation ( args kw -- ret ) } } { "alien" alien } }
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{ $description "Creates a python-compatible alien callback from a quotation." }
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{ $examples
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"This is how you create a callback which returns the double of its first positional parameter:"
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{ $unchecked-example
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"USING: python ;"
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": double-fun ( -- alien ) [ drop first 2 * ] quot>py-callback ;"
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}
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} ;
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HELP: with-quot>py-cfunction
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{ $values { "alien" alien } { "quot" quotation } }
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{ $description "Wrapper for " { $link with-callback } " to be used when passing functions as arguments to Python functions. It should be used in conjunction with " { $link quot>py-callback } " which creates the callbacks this word consumes." } ;
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HELP: python-error
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{ $error-description "When Python throws an exception, it is translated to this Factor error. " { $slot "type" } " is the class name of the python exception object, " { $slot "message" } " its string and " { $slot "traceback" } " a sequence of traceback lines, if the error has one, or " { $link f } " otherwise." } ;
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ARTICLE: "python" "Python binding"
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"The " { $vocab-link "python" } " vocab and its subvocabs implements a simple binding for libpython, allowing factor code to call native python."
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$nl
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"Converting to and from Python:"
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{ $subsections >py py> quot>py-callback }
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"Error handling:"
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{ $subsections python-error }
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"Initialization and finalization:"
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{ $subsections py-initialize py-finalize }
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"Module management:"
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{ $subsections py-import }
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"The vocab " { $vocab-link "python.syntax" } " implements a higher level factorific interface on top of the lower-level constructs in this vocab. Prefer to use that vocab most of the time."
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{ $notes "Sometimes the embedded python interpreter can't find or finds the wrong load path to it's module library. To counteract that problem it is recommended that the " { $snippet "PYTHONHOME" } " environment variable is set before " { $link py-initialize } " is called. E.g:" }
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{ $code "\"C:/python27-64bit/\" \"PYTHONHOME\" set-os-env" }
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{ $warning "All code that calls Python words should always be wrapped in a " { $link with-destructors } " context. The reason is that the words add references to Pythons internal memory heap which are removed when the destructors trigger." } ;
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ABOUT: "python"
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