Remove sys.version_info uses for Python 2.x logic

theano/_version.py

@@ -96,9 +96,7 @@ def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False, env=
         if verbose:
             print("unable to find command, tried %s" % (commands,))
         return None, None
-    stdout = p.communicate()[0].strip()
-    if sys.version_info[0] >= 3:
-        stdout = stdout.decode()
+    stdout = p.communicate()[0].strip().decode()
     if p.returncode != 0:
         if verbose:
             print("unable to run %s (error)" % dispcmd)

theano/gof/cmodule.py

@@ -1767,9 +1767,6 @@ def std_lib_dirs_and_libs():
     else:
         if platform.python_implementation() == "PyPy":
             # Assume Linux (note: Ubuntu doesn't ship this .so)
-            if sys.version_info < (3,):
-                libname = "pypy-c"
-            else:
             libname = "pypy3-c"
             # Unfortunately the only convention of this .so is that it appears
             # next to the location of the interpreter binary.
@@ -2353,7 +2350,7 @@ class GCC_compiler(Compiler):
             # redefinition for recent CPython versions (>=2.7.16 and >=3.7.3).
             # The following nullifies that redefinition, if it is found.
             python_version = sys.version_info[:3]
-            if python_version < (2, 7, 16) or (3,) <= python_version < (3, 7, 3):
+            if (3,) <= python_version < (3, 7, 3):
                 config_h_filename = distutils.sysconfig.get_config_h_filename()
                 try:
                     with open(config_h_filename) as config_h:

theano/tensor/basic.py

@@ -4025,9 +4025,6 @@ class Split(Op):
     def perform(self, node, inputs, outputs):
         """WRITEME"""
         x, axis, splits = inputs
-        # in python 2.4, x.shape[numpy.asarray(1)] don't work.
-        if sys.version_info[0:2] == (2, 4) and axis.size == 1:
-            axis = int(axis)
 
         try:
             len_along_axis = x.shape[axis]

theano/tensor/subtensor.py

@@ -1541,21 +1541,7 @@ class IncSubtensor(Op):
 
         def convert(entry):
             if isinstance(entry, gof.Type):
-                rval = indices.pop()
-                if sys.version_info < (2, 5):
-                    # Before Python 2.5, PySlice_GetIndicesEx requires
-                    # Python int to be passed.
-                    rval_ = int(rval)
-                    if rval_ != rval:
-                        raise IndexError(
-                            (
-                                "Invalid value for indexing: %s. "
-                                "That value may be too big."
-                            )
-                            % rval
-                        )
-                    return rval_
-                return rval
+                return indices.pop()
             elif isinstance(entry, slice):
                 return slice(
                     convert(entry.start), convert(entry.stop), convert(entry.step)