library: libPyROOT
#include "TPython.h"


class description - source file - inheritance tree (.pdf)

class TPython

Inheritance Chart:
static Bool_t Initialize() public:
TPython() TPython(const TPython&) ~TPython() static Bool_t Bind(TObject* obj, const char* label) static TClass* Class() static const TPyReturn& Eval(const char* expr) const static void Exec(const char* cmd) virtual TClass* IsA() const TPython& operator=(const TPython&) static void Prompt() virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

Data Members

Class Description

                          Python interpreter access

 The TPython class allows for access to python objects from CINT. The current
 functionality is only basic: ROOT objects and builtin types can cross the
 boundary between the two interpreters. All other cross-coding is based on
 strings that are run on the python interpreter.

 Example: Accessing the python interpreter from ROOT

 root [0] gSystem->Load( "libPyROOT" );
 root [1] TPython::Exec( "print 1 + 1" );  // write '2' to stdout

 // create a TBrowser on the python side, and transfer it back and forth
 root [2] TBrowser* b = (TBrowser*) Python::Eval( "ROOT.TBrowser()" );
 root [3] TPython::Bind( b, "b" );
 root [4] b == (TBrowser*) TPython::Eval( "b" )

 // builtin variables can cross-over
 root [5] int i = TPython::Eval( "1 + 1" );
 root [6] i

 It is possible to switch between interpreters by calling "TPython::Prompt()"
 on the CINT side, while returning with ^D (EOF). State is preserved between
 successive switches.

Bool_t Initialize()
 Private initialization method: setup the python interpreter and load the
 ROOT module.

void Exec( const char* cmd )
 Execute a python statement (e.g. "import ROOT").

const TPyReturn& Eval( const char* expr )
 Evaluate a python expression (e.g. "ROOT.TBrowser()").

 Caution: do not hold on to the return value: either store it in a builtin
 type (implicit casting will work), or in a pointer to a ROOT object (explicit
 casting is required).

Bool_t Bind( TObject* obj, const char* label )
 Bind a ROOT object with, at the python side, the name "label".

void Prompt()
 Enter an interactive python session (exit with ^D). State is preserved
 between successive calls.

Inline Functions

               void ~TPython()
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)
            TPython TPython()
            TPython TPython(const TPython&)
           TPython& operator=(const TPython&)

Author: Wim Lavrijsen, Apr 2004
Last update: root/pyroot:$Name: $:$Id: TPython.cxx,v 1.6 2004/11/23 21:45:06 brun Exp $

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