change loop format

pattern.py

@@ -119,7 +119,7 @@ def pat(index, tick, previous_values):
     this.values['index'] = index
     if this.pattern != None:
         i = 0
-        while i < len(this.pattern):
+        while i < range(len(this.pattern)):
             if i < len(this.pattern):
                 name = this.pattern[i]['instruction']['name']
                 targets = this.pattern[i]['instruction']['targets']