import tkinter
from tkinter import Canvas      # get graphics functions

# draws the flag of Norway
def NorwayFlag():    
    window = tkinter.Tk()   
    # create a canvas (of size 440 X 320 px)
    c = Canvas(window, width=440, height=320)
    c.pack()

    # red background
    c.create_rectangle(0, 0, 440, 320, fill="red", outline="red")

    # white stripes over red background
    c.create_rectangle(120, 0, 200, 320, fill="white", outline="white")
    c.create_rectangle(0, 120, 440, 200, fill="white", outline="white")

    # blue stripes over white ones
    c.create_rectangle(140, 0, 180, 320, fill="blue", outline="blue")
    c.create_rectangle(0, 140, 440, 180, fill="blue", outline="blue")

# -----------------------------------------
# returns the number of peak values in the given number list    
def peakCount(lst):    
    count = 0   # initialize count to 0

    # check each number other than the first and last ones
    for i in range(1, len(lst)-1):
        if lst[i] > lst[i-1] and lst[i] > lst[i+1]:  # peek number check
            count = count + 1
    return count

# -----------------------------------------
# prints the sum of each row in the given matrix
def rowSums(matrix):
    for row in range(len(matrix)):
        sum = 0  # initialize sum to 0 (whenever it starts a new row)

        # for each number of the current row add the number to the sum 
        for col in range(len(matrix[row])):
            sum = sum + matrix[row][col]

        # after adding all numbers of the row print it as requested
        print("Sum of row ", row + 1, ": ", sum)

# -----------------------------------------
# returns the sum of the digits of a given integer
def digitSum(num):
    # base case: when the number is one digit then return it back
    if num < 10:
        return num
    else:
        return num%10 + digitSum(num//10)   #recursive case