Links

Link to pull request: https://github.com/PBSPro/pbspro/pull/1227

Overview

Current Python version = 2.7

Target Python version = 3.6

Major changes in Python 3:
https://docs.python.org/3.6/howto/pyporting.html
http://python3porting.com/bookindex.html

Using lib2to3:
2to3 is a Python program that reads Python 2.x source code and applies a series of fixers to transform it into valid Python 3.x code. The standard library contains a rich set of fixers that will handle almost all code. 2to3 supporting library lib2to3 is, however, a flexible and generic library, so it is possible to write your own fixers for 2to3. lib2to3 could also be adapted to custom applications in which Python code needs to be edited automatically.
Usage: /usr/bin/python3.6 -m lib2to3 -f all -f buffer -f idioms -f set_literal -f ws_comma -w -W <python file path>
             -f all : Apply all default fixers
             -f <name of fixer>: Apply a specific fixer
             -w: Write changes to a file
             -W: always write output files even if no changes were required to the file
A list python APIs which we have used in C files of PBSPro and have changes in Python 3 (Not a complete list):

API in Python 2	API in Python 3
*PyObject PyInt_FromSsize_t(Py_ssize_t ival)**	*PyObject PyLong_FromSsize_t(Py_ssize_t v)**
*char PyString_AsString(PyObject string)*	*char PyUnicode_AsUTF8(PyObject unicode)*
*int PyString_Check(PyObject o)**	*int PyUnicode_Check(PyObject o)**
*PyObject PyString_InternFromString(const char v)*	*PyObject PyUnicode_InternFromString(const char v)*
*PyObject PyString_FromString(const char v)*	*PyObject PyUnicode_FromString(const char u)*
*PyObject Py_InitModule3(char name, PyMethodDef methods, char doc)*	*PyObject PyModule_Create(PyModuleDef def)*
struct _inittab struct _inittab { char name; void (initfunc)(void); }	struct _inittab struct _inittab { const char name; / ASCII encoded string / PyObject (*initfunc)(void); };
*PyObject PyInt_FromLong(long ival)**	*PyObject PyLong_FromLong(long v)**
*PyObject PyFile_FromFile(FILE fp, char name, char mode, int (close)(FILE))*	*PyFile_FromFd(int fd, const char name, const char mode, int buffering, const char encoding, const char errors, const char newline, int closefd)**
*unsigned PY_LONG_LONG PyInt_AsUnsignedLongLongMask(PyObject io)**	*unsigned long long PyLong_AsUnsignedLongLongMask(PyObject obj)**
PyObject_HEAD_INIT(type)	PyVarObject_HEAD_INIT(type, size)
PyTypeObject *tp = obj->ob_type;	PyTypeObject *tp = Py_Type(obj);^[3]
PyTypeObject structure	Some fields are deprecated and new fields are added to PyTypeObject structure.
void init_pbs_ifl(void)	PyObject * PyInit__pbs_ifl(void)

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