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cdef extern from "Python.h": 
 
    ########################################################################### 
    # Iterator Objects 
    ########################################################################### 
 
    bint PySeqIter_Check(object op) 
    # Return true if the type of op is PySeqIter_Type. 
 
    object PySeqIter_New(object seq) 
    # Return value: New reference. 
    # Return an iterator that works with a general sequence object, seq. The 
    # iteration ends when the sequence raises IndexError for the subscripting 
    # operation. 
 
    bint PyCallIter_Check(object op) 
    # Return true if the type of op is PyCallIter_Type. 
 
    object PyCallIter_New(object callable, object sentinel) 
    # Return value: New reference. 
    # Return a new iterator. The first parameter, callable, can be any Python 
    # callable object that can be called with no parameters; each call to it 
    # should return the next item in the iteration. When callable returns a 
    # value equal to sentinel, the iteration will be terminated.