When operating code objects, do NOT directly use types.CodeType and use pyobject.Code instead, as constructing types.CodeType is too complex and not compatible across multiple Python versions.

The pyobject library, which can be installed via pip install pyobject, provides a high-level wrapper for code objects.

For example, your newCode function can be replaced by:

from pyobject import Code
c=Code() # use default attributes to create it
# firstly define consts, size, etc.
c.co_consts=consts
c.co_stacksize=size
...
# convert it to bytecode (types.CodeType)
co=c.to_code()
# or disassembly it (equivalent to dis.dis(c.to_code()) )
c.dis()

For the documentation, please refer to the README.rst in pyobject · GitHub.

Note: I'm the developer of pyobject.