make raw_input() usage compatible with Py2/Py3

Cython/Debugger/libcython.py

@@ -4,6 +4,11 @@ GDB extension that adds Cython support.
 
 from __future__ import print_function
 
+try:
+    input = raw_input
+except NameError:
+    pass
+
 import sys
 import textwrap
 import traceback
@@ -799,7 +804,7 @@ class CyBreak(CythonCommand):
 
                 while True:
                     try:
-                        result = raw_input(
+                        result = input(
                             "Select a function, press 'a' for all "
                             "functions or press 'q' or '^D' to quit: ")
                     except EOFError:

Cython/Debugger/libpython.py

@@ -45,6 +45,12 @@ the type names are known to the debugger
 
 The module also extends gdb with some python-specific commands.
 '''
+
+try:
+    input = raw_input
+except NameError:
+    pass
+
 import os
 import re
 import sys
@@ -2549,7 +2555,7 @@ class PyExec(gdb.Command):
             lines = []
             while True:
                 try:
-                    line = raw_input('>')
+                    line = input('>')
                 except EOFError:
                     break
                 else: