Removed check for python version

ebook_converter/ebooks/pdf/pdftohtml.py

@@ -7,7 +7,7 @@ import sys
 
 from ebook_converter import CurrentDir, xml_replace_entities, prints
 from ebook_converter.constants import (
-    filesystem_encoding, isbsd, islinux, isosx, ispy3, iswindows
+    filesystem_encoding, isbsd, islinux, isosx, iswindows
 )
 from ebook_converter.ebooks import ConversionError, DRMError
 from ebook_converter.ebooks.chardet import xml_to_unicode
@@ -20,8 +20,6 @@ PDFTOHTML = 'pdftohtml'
 
 
 def popen(cmd, **kw):
-    if not ispy3:
-        cmd = [x.encode(filesystem_encoding) if not isinstance(x, bytes) else x for x in cmd]
     if iswindows:
         kw['creationflags'] = 0x08
     return subprocess.Popen(cmd, **kw)

ebook_converter/ebooks/pdf/render/common.py

@@ -2,7 +2,6 @@ import codecs, zlib, numbers
 from io import BytesIO
 from datetime import datetime
 
-from ebook_converter.constants import ispy3
 from ebook_converter.utils.logging import default_log
 from ebook_converter.polyglot.binary import as_hex_bytes
 
@@ -65,7 +64,7 @@ def serialize(o, stream):
         # Must check bool before int as bools are subclasses of int
         stream.write_raw(b'true' if o else b'false')
     elif isinstance(o, numbers.Integral):
-        stream.write_raw(str(o).encode('ascii') if ispy3 else bytes(o))
+        stream.write_raw(str(o).encode('ascii'))
     elif hasattr(o, 'pdf_serialize'):
         o.pdf_serialize(stream)
     elif o is None: