Support python 3.7, 3.8, 3.9 in conditional section expressions (#535)

Co-authored-by: Michael Howitz <mh@gocept.com>

CHANGES.rst

@@ -4,7 +4,7 @@ Change History
 3.0.0a3 (unreleased)
 ====================
 
-- Nothing changed yet.
+- Support python37, python38 and python39 in conditional section expressions
 
 
 3.0.0a2 (2020-05-25)

doc/topics/variables-extending-and-substitutions.rst

@@ -199,6 +199,9 @@ python33       True if running Python 3.3
 python34       True if running Python 3.4
 python35       True if running Python 3.5
 python36       True if running Python 3.6
+python37       True if running Python 3.7
+python38       True if running Python 3.8
+python39       True if running Python 3.9
 sys_version    ``sys.version.lower()``
 pypy           True if running PyPy
 jython         True if running Jython

src/zc/buildout/buildout.py

@@ -1733,9 +1733,9 @@ def _default_globals():
     globals_defs.update({'python2': major_python_versions[0] == '2',
                          'python3': major_python_versions[0] == '3'})
 
-    # minor python major_python_versions as python24, python25 ... python36
+    # minor python major_python_versions as python24, python25 ... python39
     minor_python_versions = ('24', '25', '26', '27',
-                             '30', '31', '32', '33', '34', '35', '36')
+                             '30', '31', '32', '33', '34', '35', '36', '37', '38', '39')
     for v in minor_python_versions:
         globals_defs['python' + v] = ''.join(major_python_versions[:2]) == v
 

src/zc/buildout/configparser.test

@@ -291,7 +291,7 @@ called by buildout::
 
   # major and minor python versions, yes even python 3.5 and 3.6 are there , prospectively
   # comment: this expression "is true" and not that long expression cannot span several lines
-  [s2: any([python2, python3, python24 , python25 , python26 , python27 , python30 , python31 , python32 , python33 , python34 , python35 , python36]) ]
+  [s2: any([python2, python3, python24 , python25 , python26 , python27 , python30 , python31 , python32 , python33 , python34 , python35 , python36, python37, python38,python39]) ]
   b = 1
 
   # common python interpreter types