From a3d2b847dbaca798d02f1d1b88d335613e1255cf Mon Sep 17 00:00:00 2001
From: Xano Trevisan Kothe <xanokothe@gmail.com>
Date: Thu, 9 Jul 2020 18:52:42 +0200
Subject: [PATCH] fix: #609 support for python 2.6

Backtrace of the issue:
    from docx import Document
    Traceback (most recent call last):
    File , line 1, in
    File /usr/lib/python2.6/site-packages/docx/init.py, line 3, in
    from docx.api import Document # noqa
    File /usr/lib/python2.6/site-packages/docx/api.py, line 14, in
    from docx.package import Package
    File /usr/lib/python2.6/site-packages/docx/package.py, line 9, in
    from docx.opc.package import OpcPackage
    File /usr/lib/python2.6/site-packages/docx/opc/package.py, line 116
    partnames = {part.partname for part in self.iter_parts()}
    ^
    SyntaxError: invalid syntax
---
 docx/opc/package.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docx/opc/package.py b/docx/opc/package.py
index 7ba87bab5..c203d3963 100644
--- a/docx/opc/package.py
+++ b/docx/opc/package.py
@@ -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: