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-rw-r--r--gn3/computations/slink.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/gn3/computations/slink.py b/gn3/computations/slink.py
index bec8597..d6f6028 100644
--- a/gn3/computations/slink.py
+++ b/gn3/computations/slink.py
@@ -4,5 +4,14 @@ class LengthError(BaseException):
class MirrorError(BaseException):
pass
+def raise_valueerror_if_data_is_not_lists_or_tuples(lists):
+ """Check that `lists` is a list of lists: If not, raise an exception."""
+ def is_list_or_tuple(item):
+ return type(item) == type([]) or type(item) == type(tuple)
+
+ if (not is_list_or_tuple(lists)) or (not all(map(is_list_or_tuple, lists))):
+ raise ValueError("Expected list or tuple")
+
def nearest(lists, i, j):
+ raise_valueerror_if_data_is_not_lists_or_tuples(lists)
return None