eryksun added the comment:
When appending to a singly-referenced string, the interpreter tries to
reallocate the string in place. This applies to both `s += 'text'` and `s = s +
'text'`. Storing to a temp variable is adding a 2nd reference, so a new string
gets allocated instead. If the former is the case (i.e. the object id is the
same after appending), use ctypes to check the string's cached wide-string
(wchar_t *) representation:
from ctypes import *
pythonapi.PyUnicode_AsUnicode.argtypes = [py_object]
pythonapi.PyUnicode_AsUnicode.restype = c_wchar_p
print(pythonapi.PyUnicode_AsUnicode(bak_path))
The wstr cache should be cleared when the string is reallocated in place, so
this is probably a dead end.
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<http://bugs.python.org/issue22719>
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