dict incr


increment a value in a dictionary


dict incr variable key ?increment?


Adds the given increment value (an integer that defaults to 1 if not specified) to the value that the given key maps to in the dictionary value contained in the given variable, writing the resulting dictionary value back to that variable, and returning the value of the entire dictionary. Non-existent keys are treated as if they map to 0. It is an error to increment a value for an existing key if that value is not an integer.

See also