1 files changed, 130 insertions, 0 deletions
diff --git a/lib/python2.7/test/test_unpack.py b/lib/python2.7/test/test_unpack.py
new file mode 100644
index 0000000..7ddbc62
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+++ b/lib/python2.7/test/test_unpack.py
@@ -0,0 +1,130 @@
+doctests = """
+
+Unpack tuple
+
+    >>> t = (1, 2, 3)
+    >>> a, b, c = t
+    >>> a == 1 and b == 2 and c == 3
+    True
+
+Unpack list
+
+    >>> l = [4, 5, 6]
+    >>> a, b, c = l
+    >>> a == 4 and b == 5 and c == 6
+    True
+
+Unpack implied tuple
+
+    >>> a, b, c = 7, 8, 9
+    >>> a == 7 and b == 8 and c == 9
+    True
+
+Unpack string... fun!
+
+    >>> a, b, c = 'one'
+    >>> a == 'o' and b == 'n' and c == 'e'
+    True
+
+Unpack generic sequence
+
+    >>> class Seq:
+    ...     def __getitem__(self, i):
+    ...         if i >= 0 and i < 3: return i
+    ...         raise IndexError
+    ...
+    >>> a, b, c = Seq()
+    >>> a == 0 and b == 1 and c == 2
+    True
+
+Single element unpacking, with extra syntax
+
+    >>> st = (99,)
+    >>> sl = [100]
+    >>> a, = st
+    >>> a
+    99
+    >>> b, = sl
+    >>> b
+    100
+
+Now for some failures
+
+Unpacking non-sequence
+
+    >>> a, b, c = 7
+    Traceback (most recent call last):
+      ...
+    TypeError: 'int' object is not iterable
+
+Unpacking tuple of wrong size
+
+    >>> a, b = t
+    Traceback (most recent call last):
+      ...
+    ValueError: too many values to unpack
+
+Unpacking tuple of wrong size
+
+    >>> a, b = l
+    Traceback (most recent call last):
+      ...
+    ValueError: too many values to unpack
+
+Unpacking sequence too short
+
+    >>> a, b, c, d = Seq()
+    Traceback (most recent call last):
+      ...
+    ValueError: need more than 3 values to unpack
+
+Unpacking sequence too long
+
+    >>> a, b = Seq()
+    Traceback (most recent call last):
+      ...
+    ValueError: too many values to unpack
+
+Unpacking a sequence where the test for too long raises a different kind of
+error
+
+    >>> class BozoError(Exception):
+    ...     pass
+    ...
+    >>> class BadSeq:
+    ...     def __getitem__(self, i):
+    ...         if i >= 0 and i < 3:
+    ...             return i
+    ...         elif i == 3:
+    ...             raise BozoError
+    ...         else:
+    ...             raise IndexError
+    ...
+
+Trigger code while not expecting an IndexError (unpack sequence too long, wrong
+error)
+
+    >>> a, b, c, d, e = BadSeq()
+    Traceback (most recent call last):
+      ...
+    BozoError
+
+Trigger code while expecting an IndexError (unpack sequence too short, wrong
+error)
+
+    >>> a, b, c = BadSeq()
+    Traceback (most recent call last):
+      ...
+    BozoError
+
+"""
+
+__test__ = {'doctests' : doctests}
+
+def test_main(verbose=False):
+    from test import test_support
+    from test import test_unpack
+    test_support.run_doctest(test_unpack, verbose)
+
+if __name__ == "__main__":
+    test_main(verbose=True)