How to pause a loop with a mouse click using pygame?

I m a beginner in python and I m doing a project using pygame. I initiated a loop on a mouse click and it runs good. But i couldn't stop that loop. I want it to stop on a mouse click and the loop should run until that mouse click. I have provided the outline of the code, below. Can anyone help me with a proper code? Thanks in advance.

for event in pygame.event.get():
    if (event.type == pygame.MOUSEBUTTONDOWN):
         (mx,my)= pygame.mouse.get_pos()
         if((mx>=375)&(mx<=425)&(my>=500)&(my<=550)): #to begin loop on mouse click#
           while True:
              ---statements-----
              if((mx>=300)&(mx<=350)&(my>=500)&(my<=550)): #to end loop on mouse click#
                 exit
              else:
                 continue

The problem is that once you enter the while True loop, you are no longer waiting for mouse events coming from pygame. Try checking for new events right before looping:

for event in pygame.event.get(pygame.MOUSEBUTTONDOWN):
    mx, my = pygame.mouse.get_pos()
    if 375 <= mx <= 425 and 500 <= my <= 550:
        run = True
        while run:
            # statements
            # ...
            for event in pygame.event.get(pygame.MOUSEBUTTONDOWN):
                mx, my = pygame.mouse.get_pos()
                if 300 <= mx <= 350 and 500 <= my <= 550:
                    run = False

You can filter directly the events in the event.get call.

Note that I rewrote the boundary checks, as the logic and in Python is actualy and, while & is a bitwise operation. Python allows for a cool syntax when checking ranges too!