try:
    from rpy2.rinterface import RRuntimeError
    from rpy2.robjects.packages import importr
    from rpy2.robjects.numpy2ri import numpy2ri
    import rpy2.robjects as ro
    ro.conversion.py2ri = numpy2ri
    _coda = importr('coda')
    _HAS_CODA = True
    _HAS_RPY2 = True
except (ImportError, LookupError):
    _HAS_CODA = False
    _HAS_RPY2 = False
except RRuntimeError:
    _HAS_CODA = False
    _HAS_RPY2 = True