clock

Returns the number of milliseconds since the start of the program

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Syntax:

clock()

Note: The timer is reset to zero when pygame_functions is imported.

This can be used to ensure that a certain event happens at set intervals.
eg.

 targetTime = 0
 while True:
      theTime = clock()
      if theTime>targetTime:
          targetTime = theTime + 2000
          #this code should only happen every 2000 milliseconds