the length of the correct sequence is calculated

sequence_update.py

@@ -173,17 +173,39 @@ class Sequence:
         k=-1
 
         #we can compare sequences only if they are of the same length
-        if len(user_seq) != len(self.sequence):
+        if len(user_seq) == len(self.sequence):
             k = 0
             #the loop comparing two sequences by comparing each pair of elements
             for i in range(len(self.sequence)):
 
                 #if elements on the same position in two sequences are not equal,
                 #then the counter is getting +1
-                if user_seq[i].ID == self.sequence[i].ID:
+                if user_seq[i].ID != self.sequence[i].ID:
                     k = k + 1
         return k
 
+    # user_seq -- the sequence which user entered
+    def compare_sequences_length(self, user_seq):
+        '''this method compares sequences and returns the length of the correctly repeated sequence'''
+        #k -- counter for errors that user made while repeating the pattern
+        #if this metod returns -1, we know that there is an error in input
+        k=-1
+
+        #we can compare sequences only if they are of the same length
+        if len(user_seq) == len(self.sequence):
+            k = 0
+            #the loop comparing two sequences by comparing each pair of elements
+            for i in range(len(self.sequence)):
+
+                #if elements on the same position in two sequences are not equal,
+                #then then break
+                if user_seq[i].ID != self.sequence[i].ID:
+                    break
+                #if elements on the same position are equal, the length of the correct
+                #sequence is increased by 1
+                k = k + 1
+        return k
+
 #this class will be tested, thus, we need this main method
 #as it sets the environment where we are going to test
 def main():