pyabc: reorganize supporting python scripts

src/python/getch.py

@@ -0,0 +1,37 @@
+
+class _Getch:
+    """Gets a single character from standard input.  Does not echo to the screen."""
+    def __init__(self):
+        try:
+            self.impl = _GetchWindows()
+        except ImportError:
+            self.impl = _GetchUnix()
+
+    def __call__(self): return self.impl()
+
+
+class _GetchUnix:
+    def __init__(self):
+        import tty, sys
+
+    def __call__(self):
+        import sys, tty, termios
+        fd = sys.stdin.fileno()
+        old_settings = termios.tcgetattr(fd)
+        try:
+            tty.setraw(sys.stdin.fileno())
+            ch = sys.stdin.read(1)
+        finally:
+            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
+        return ch
+
+
+class _GetchWindows:
+    def __init__(self):
+        import msvcrt
+
+    def __call__(self):
+        import msvcrt
+        return msvcrt.getch()
+
+getch = _Getch()