Rename shortest_job_first_algorithm.py to shortest_job_first.py (TheAlgorithms#2164)

* Rename shortest_job_first_algorithm.py to shortest_job_first.py

* updating DIRECTORY.md

* Minor tweek to round_robin.py

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Author: cclauss

DIRECTORY.md

@@ -591,7 +591,8 @@
 
 ## Scheduling
   * [First Come First Served](https://github.com/TheAlgorithms/Python/blob/master/scheduling/first_come_first_served.py)
-  * [Shortest Job First Algorithm](https://github.com/TheAlgorithms/Python/blob/master/scheduling/shortest_job_first_algorithm.py)
+  * [Round Robin](https://github.com/TheAlgorithms/Python/blob/master/scheduling/round_robin.py)
+  * [Shortest Job First](https://github.com/TheAlgorithms/Python/blob/master/scheduling/shortest_job_first.py)
 
 ## Searches
   * [Binary Search](https://github.com/TheAlgorithms/Python/blob/master/searches/binary_search.py)

scheduling/round_robin.py

@@ -23,7 +23,7 @@ def calculate_waiting_times(burst_times: List[int]) -> List[int]:
     rem_burst_times = list(burst_times)
     waiting_times = [0] * len(burst_times)
     t = 0
-    while 1:
+    while True:
         done = True
         for i, burst_time in enumerate(burst_times):
             if rem_burst_times[i] > 0:
@@ -33,7 +33,7 @@ def calculate_waiting_times(burst_times: List[int]) -> List[int]:
                     rem_burst_times[i] -= quantum
                 else:
                     t += rem_burst_times[i]
-                    waiting_times[i] = t - burst_times[i]
+                    waiting_times[i] = t - burst_time
                     rem_burst_times[i] = 0
         if done is True:
             return waiting_times