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The Python27.lib file shipped with the 64-bit Windows installer (.msi) has several symbols with improper values. The problem appears to be a single underscore instead of a double underscore between __imp and Py in the symbol. Attempting to build our application which links to Python in Visual Studio 2008, the following symbols are undefined due to this problem:
 __imp__PyCallable_Check
 __imp__PyClass_Type
 __imp__PyDict_GetItemString
 __imp__PyErr_Clear
 __imp__PyErr_Fetch
 __imp__PyErr_Occurred
 __imp__PyImport_ImportModule
 __imp__PyInstance_Type
 __imp__PyModule_GetDict
 __imp__PyObject_CallObject
 __imp__PyRun_SimpleStringFlags
 __imp__PyString_AsString
 __imp__PyString_AsStringAndSize
 __imp__PyString_FromStringAndSize
 __imp__PyString_Type
 __imp__PyTraceBack_Type
 __imp__PyTuple_New
 __imp__PyTuple_SetItem
 __imp__PyType_IsSubtype
 __imp__PyUnicodeUCS2_AsUnicode
 __imp__PyUnicodeUCS2_FromUnicode
 __imp__PyUnicodeUCS2_GetSize
 __imp__Py_DecRef
 __imp__Py_Finalize
 __imp__Py_Initialize
These symbols appear to be properly defined in the 32-bit version.