Create 732_My_Calendar_III.py (qiyuangong#64)

* Added solution for Add 732_My_Calendar_III.py problem from Leetcode

Contributed by @parkjonggyeong18

Author: parkjonggyeong18

python/732_My_Calendar_III.py

@@ -0,0 +1,17 @@
+from sortedcontainers import SortedDict
+
+
+class MyCalendarThree:
+  def __init__(self):
+    self.timeline = SortedDict()
+
+  def book(self, start: int, end: int) -> int:
+    self.timeline[start] = self.timeline.get(start, 0) + 1
+    self.timeline[end] = self.timeline.get(end, 0) - 1
+
+    ans = 0
+    activeEvents = 0
+
+    for count in self.timeline.values():
+      activeEvents += count
+      ans = max(ans, activeEvents)