bpo-33692: pythoninfo detect libedit on Python 2.7 (#7246)

Check which readline implementation is used based on the readline
docstring.

diff --git a/Lib/test/pythoninfo.py b/Lib/test/pythoninfo.py
index f40ff8d0eba1fe1e43c2d5822416ae5b12db7e14..92b51580399162b727dd22e078876858f86dddbd 100644 (file)
--- a/Lib/test/pythoninfo.py
+++ b/Lib/test/pythoninfo.py
@@ -275,6 +275,14 @@ def collect_readline(info_add):
     copy_attributes(info_add, readline, 'readline.%s', attributes,
                     formatter=format_attr)
 
+    if not hasattr(readline, "_READLINE_LIBRARY_VERSION"):
+        # _READLINE_LIBRARY_VERSION has been added to CPython 3.7
+        doc = getattr(readline, '__doc__', '')
+        if 'libedit readline' in doc:
+            info_add('readline.library', 'libedit readline')
+        elif 'GNU readline' in doc:
+            info_add('readline.library', 'GNU readline')
+
 
 def collect_gdb(info_add):
     import subprocess