Changeset 7815:2ab111feb2f0

Timestamp:

12/18/07 22:36:56 (5 years ago)

Author:

R. L. Miller <rlmillster@…>

Branch:

default

Message:

type check

File:

• sage/groups/perm_gps/permgroup_element.pyx (modified) (2 diffs)

sage/groups/perm_gps/permgroup_element.pyx

@@ -388 +388 @@
             sage: g(('who','what','when','where','why'))
             ('what', 'when', 'who', 'why', 'where')
+
+            sage: g(x)
+            Traceback (most recent call last):
+            ...
+            ValueError: Must be an integer, list, tuple or string.
+            sage: g(3/2)
+            Traceback (most recent call last):
+            ...
+            ValueError: Must be an integer, list, tuple or string.
+            
         """
         cdef int j
@@ -399 +409 @@
             return permuted
         else:
+            if not isinstance(i, (int, Integer)):
+                raise ValueError("Must be an integer, list, tuple or string.")
             j = i
             if 1 <= j <= self.n: