Add third_party/pexpect

third_party/pexpect/examples/python.py

Index: third_party/pexpect/examples/python.py
diff --git a/third_party/pexpect/examples/python.py b/third_party/pexpect/examples/python.py
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+++ b/third_party/pexpect/examples/python.py
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+#!/usr/bin/env python
+
+'''This starts the python interpreter; captures the startup message; then gives
+the user interactive control over the session. Why? For fun...
+
+PEXPECT LICENSE
+
+    This license is approved by the OSI and FSF as GPL-compatible.
+        http://opensource.org/licenses/isc-license.txt
+
+    Copyright (c) 2012, Noah Spurrier <noah@noah.org>
+    PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
+    PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
+    COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+'''
+
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import pexpect
+
+# Don't do this unless you like being John Malkovich
+# c = pexpect.spawnu('/usr/bin/env python ./python.py')
+
+# Note that, for Python 3 compatibility reasons, we are using spawnu and
+# importing unicode_literals (above). spawnu accepts Unicode input and
+# unicode_literals makes all string literals in this script Unicode by default.
+c = pexpect.spawnu('/usr/bin/env python')
+
+c.expect('>>>')
+print('And now for something completely different...')
+print(''.join(reversed((c.before))))
+print('Yes, it\'s python, but it\'s backwards.')
+print()
+print('Escape character is \'^]\'.')
+print(c.after, end=' ')
+c.interact()
+c.kill(1)
+print('is alive:', c.isalive())
+