Find longest range (consecutive) in number list

#393.py

@@ -0,0 +1,21 @@
+def find_longest_range(l):
+    l = sorted(l)
+    length = 0
+    max_len = 0
+    max_rnge = None
+    for i in range(len(l)):
+        if i > 0 and l[i-1]+1 == l[i]:
+            length += 1
+        else:
+            length = 1
+
+        if length > max_len:
+            max_len = length
+            max_rnge = (l[i-length+1], l[i])
+
+    return max_rnge
+
+
+if __name__ == "__main__":
+    r = find_longest_range([9,6,1,3,8,10,12,11])
+    print(r)