Refactor out common compat constants

Author: jakirkham

pandas/compat/__init__.py

@@ -26,11 +26,7 @@
     pa_version_under9p0,
 )
 
-PY39 = sys.version_info >= (3, 9)
-PY310 = sys.version_info >= (3, 10)
-PY311 = sys.version_info >= (3, 11)
-PYPY = platform.python_implementation() == "PyPy"
-IS64 = sys.maxsize > 2**32
+from pandas.compat._constants import *
 
 
 def set_function_name(f: F, name: str, cls) -> F:

pandas/compat/_compressors.py

@@ -8,6 +8,8 @@
 import pickle
 import sys
 
+from pandas.compat._constants import PY310
+
 try:
     import lzma
 
@@ -16,9 +18,6 @@
     has_lzma = False
 
 
-PY310 = sys.version_info >= (3, 10)
-
-
 def flatten_buffer(
     b: bytes | bytearray | memoryview | pickle.PickleBuffer,
 ) -> bytes | memoryview:

pandas/compat/_constants.py

@@ -0,0 +1,17 @@
+"""
+_constants
+======
+
+Constants relevant for the Python implementation.
+"""
+
+from __future__ import annotations
+
+import sys
+import platform
+
+PY39 = sys.version_info >= (3, 9)
+PY310 = sys.version_info >= (3, 10)
+PY311 = sys.version_info >= (3, 11)
+PYPY = platform.python_implementation() == "PyPy"
+IS64 = sys.maxsize > 2**32