Riven Fast Q-combo click trainer (Python 3.4+)

rivencombo.py

import tkinter as tk
import time
import statistics

CIRCLE_X=100
CIRCLE_Y=120
CIRCLE_RADIUS=40

PREVIOUS_ACTION=None
CORRECT_MOVE=True
CORRECT_COMBO_COUNT = 0

#Valid click states:
R_CLICK_ON_ENEMY = "R_CLICK_ON_ENEMY"
Q_ON_ENEMY = "Q_ON_ENEMY"
Q_ON_GROUND = "Q_ON_GROUND"
R_CLICK_ON_GROUND = "R_CLICK_ON_GROUND"

comboTimingRecords = []

root = tk.Tk()
canvas = tk.Canvas(root, width=640, height=480, borderwidth=0, highlightthickness=0, bg="black")
canvas.grid()
def _create_circle(self, x, y, r, **kwargs):
    return self.create_oval(x-r, y-r, x+r, y+r, **kwargs)
tk.Canvas.create_circle = _create_circle


def in_circle(center_x, center_y, radius, x, y):
    square_dist = (center_x - x) ** 2 + (center_y - y) ** 2
    return square_dist <= radius ** 2


def setErrorStateIfNecessary(correctMove):
    global canvas
    if not correctMove:
        canvas.configure(background="dark red")

circle_id = canvas.create_circle(x=CIRCLE_X, y=CIRCLE_Y, r=CIRCLE_RADIUS, fill="blue", outline="#DDD", width=4)
counterLabel = tk.Label(root, text="Count: " + str(CORRECT_COMBO_COUNT), fg = "white", bg="green")

def resetEnvironment():
    global PREVIOUS_ACTION, CORRECT_MOVE, canvas, counterLabel, CORRECT_COMBO_COUNT
    PREVIOUS_ACTION = None
    CORRECT_MOVE = True
    canvas.configure(background="black")
    CORRECT_COMBO_COUNT = 0
    counterLabel.config(text="Count: " + str(CORRECT_COMBO_COUNT))

#Reset button:
b1 = tk.Button(root, text="Reset", command=resetEnvironment)
b1.grid(row=0, column = 0)
counterLabel.grid(row=0, column = 1)


#Bind click action
def clickCoords(event):
    global PREVIOUS_ACTION, CORRECT_MOVE, CORRECT_COMBO_COUNT, counterLabel, timeAtEndOfCombo, timeAtStartOfCombo, comboTimingRecords
    isInCircle = in_circle(CIRCLE_X, CIRCLE_Y, CIRCLE_RADIUS, event.x, event.y)
    currentAction = None
    if isInCircle:
        currentAction = R_CLICK_ON_ENEMY
    else:
        currentAction = R_CLICK_ON_GROUND

    if (currentAction is R_CLICK_ON_ENEMY):
        if ((PREVIOUS_ACTION is None) or (PREVIOUS_ACTION is R_CLICK_ON_GROUND)):
            if (PREVIOUS_ACTION is R_CLICK_ON_GROUND):
                CORRECT_COMBO_COUNT +=1
                timeAtEndOfCombo = int(time.time())
                comboTimingRecords.append(timeAtEndOfCombo - timeAtStartOfCombo)
                meanComboTime = statistics.mean(comboTimingRecords)
                combosAndAvg = "Count: " + str(CORRECT_COMBO_COUNT)  + "\n" \
                        "Avg: " + str(meanComboTime)
                counterLabel.config(text=combosAndAvg)
            else:
                timeAtStartOfCombo = int(time.time())
            CORRECT_MOVE = True
        else:
            CORRECT_MOVE = False
    else:
        if (PREVIOUS_ACTION is Q_ON_ENEMY):
            CORRECT_MOVE = True
        else:
            CORRECT_MOVE = False

    PREVIOUS_ACTION = currentAction
    setErrorStateIfNecessary(CORRECT_MOVE)

canvas.bind("<Button 3>", clickCoords)

#Bind q action
def qCoords(event):
    global PREVIOUS_ACTION, CORRECT_MOVE
    isInCircle = in_circle(CIRCLE_X, CIRCLE_Y, CIRCLE_RADIUS, event.x, event.y)
    if isInCircle:
        currentAction = Q_ON_ENEMY
    else:
        currentAction = Q_ON_GROUND

    if (currentAction is Q_ON_ENEMY) and (PREVIOUS_ACTION is R_CLICK_ON_ENEMY):
        CORRECT_MOVE = True
    else:
        CORRECT_MOVE = False
    PREVIOUS_ACTION = currentAction
    setErrorStateIfNecessary(CORRECT_MOVE)

canvas.focus_set()
canvas.bind("<q>", qCoords)

#TODO Timing -- check time since previous event
#TODO Timing -- build up speed - time taken since first AA and second.
#TODO High score -- using pickle or shelve or some shit.
#TODO button to reduce enemy size 


root.wm_title("Riven Fast Q-Combo Clicker")
root.mainloop()

Thanks I will add