From 330b09dcd5d353b4e3b73d1d5c2aba0c85843e9f Mon Sep 17 00:00:00 2001
From: Will Roberts <will.roberts@rz.hu-berlin.de>
Date: Fri, 17 Apr 2015 21:00:52 +0200
Subject: [PATCH] relax strict requirement of `future` and `pyparsing` packages

---
 nltk_tgrep/tests/test_tgrep.py |  8 ++++++--
 nltk_tgrep/tgrep.py            | 14 +++++++++++---
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/nltk_tgrep/tests/test_tgrep.py b/nltk_tgrep/tests/test_tgrep.py
index a5d0d13..055976b 100644
--- a/nltk_tgrep/tests/test_tgrep.py
+++ b/nltk_tgrep/tests/test_tgrep.py
@@ -7,8 +7,12 @@
 (c) 16 March, 2013 Will Roberts
 '''
 
-from __future__ import unicode_literals
-from builtins import range
+from __future__ import print_function, unicode_literals
+try:
+    from builtins import range
+except ImportError:
+    print('Warning: nltk_tgrep may not work correctly on Python 2.* without the ')
+    print('`future` package installed.')
 from nltk.tree import ParentedTree
 from .. import tgrep
 import unittest
diff --git a/nltk_tgrep/tgrep.py b/nltk_tgrep/tgrep.py
index ef09e56..40639fe 100644
--- a/nltk_tgrep/tgrep.py
+++ b/nltk_tgrep/tgrep.py
@@ -60,11 +60,19 @@
 macro definitions to `m` and initialises `l` to an empty dictionary.
 '''
 
-from __future__ import unicode_literals
-from builtins import bytes, range, str
+from __future__ import print_function, unicode_literals
+try:
+    from builtins import bytes, range, str
+except ImportError:
+    print('Warning: nltk_tgrep may not work correctly on Python 2.* without the')
+    print('`future` package installed.')
 import functools
 import nltk.tree
-import pyparsing
+try:
+    import pyparsing
+except ImportError:
+    print('Warning: nltk_tgrep will not work without the `pyparsing` package')
+    print('installed.')
 import re
 
 class TgrepException(Exception):