same test for 'and' operator

tests/run/and.pyx

+u"""
+>>> a,b = 'a *','b *' # use non-interned strings
+
+>>> and2_assign(2,3) == (2 and 3)
+True
+>>> and2_assign('a', 'b') == ('a' and 'b')
+True
+>>> and2_assign(a, b) == (a and b)
+True
+
+>>> and2(2,3) == (2 and 3)
+True
+>>> and2(0,2) == (0 and 2)
+True
+>>> and2('a', 'b') == ('a' and 'b')
+True
+>>> and2(a, b) == (a and b)
+True
+>>> and2('', 'b') == ('' and 'b')
+True
+>>> and2([], [1]) == ([] and [1])
+True
+>>> and2([], [a]) == ([] and [a])
+True
+
+>>> and3(0,1,2) == (0 and 1 and 2)
+True
+>>> and3([],(),[1]) == ([] and () and [1])
+True
+
+>>> and2_no_result(2,3)
+>>> and2_no_result(0,2)
+>>> and2_no_result('a','b')
+>>> and2_no_result(a,b)
+>>> a and b
+'b *'
+"""
+
+def and2_assign(a,b):
+    c = a and b
+    return c
+
+def and2(a,b):
+    return a and b
+
+def and3(a,b,c):
+    d = a and b and c
+    return d
+
+def and2_no_result(a,b):
+    a and b