DEP: Remove Python 2.6 and older support (#776)

MartinThoma · web-flow · commit b08f9aa3e066 · 2022-04-18T09:16:02.000+02:00
"New" features that we use: * PEP-343: with statements (Python 2.5+) * PEP-389: argparse (Python 2.7+; just in Scripts) * https://bugs.python.org/issue2335 : Set literals * https://bugs.python.org/issue2333 : Dictionary / set comprehensions * ... Python 2.6 had its last security update in 2013 - 9 years ago. I'm sure people have long moved on. The package is also marked as Python 2.7+ and CI only runs for Python 2.7 and 3.6+. For this reason, I will not make a major version bump.
diff --git a/PyPDF2/pdf.py b/PyPDF2/pdf.py
@@ -76,13 +76,7 @@
     u_,
 )
 
-if version_info < ( 2, 4 ):
-   from sets import ImmutableSet as frozenset
-
-if version_info < ( 2, 5 ):
-    from md5 import md5
-else:
-    from hashlib import md5
+from hashlib import md5
 
 
 class PdfFileWriter(object):
