Update poor_perf.py

Author: proquickly

src/uw_py220_extras/lesson06_assignment/poor_perf.py

@@ -17,6 +17,7 @@ def save_it(alist, name):
 
 
 def calc(write=False, ranges=(25, 35, 20, 42)):
+    # you can only change code between this line....
     a = [fibo(i) for i in range(ranges[0])]
     if write:
         save_it(a, "a.csv")
@@ -30,6 +31,7 @@ def calc(write=False, ranges=(25, 35, 20, 42)):
     if write:
         save_it(d, "d.csv")
 
+    # and this line
 
 if __name__ == "__main__":
     calc(True, (24, 34, 21, 42))