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5 changes: 4 additions & 1 deletion docx/opc/package.py
Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,10 @@ def next_partname(self, template):
containing a single replacement item, a '%d' to be used to insert the integer
portion of the partname. Example: "/word/header%d.xml"
"""
partnames = {part.partname for part in self.iter_parts()}
partnames = {}
for part in self.iter_parts():
partnames.append(part.partname)

for n in range(1, len(partnames) + 2):
candidate_partname = template % n
if candidate_partname not in partnames:
Expand Down