for more information, see https://pre-commit.ci

to fix #39 also in Python2

As PyState_AddModule is not yet called in the module definition,
PyState_FindModule will not work, so for Python 3 we need to get the
module from the methods definition to retrieve a pointer to dgpyError.

Fix #39

    global variables g_pool and g_factory have been replaced by
    PoolStorage::getInstance and FactoryStorage::getInstance static methods.

    When help was invoked with a wrong command name, the interpreter failed with
    segmentation fault.

  This avoids to miss exceptions and to terminate the python interpreter.

Nicolas Mansard authored 14 years ago and Nicolas Mansard committed 14 years ago

Changed the call to create_entity: when the required creation names already exists, check is the existing object is of the same class. If it is, returns the existing object instead of creating a new oine.