count = 0

def custom_shirt(size, msg="I'll get A+", location="front"):
    '''include docstring
       understand function, positional - order matter in function call,
       named - order no longer matter,
       optional - may call a function with fewer number arguments
    '''
    global count  # understand the concept of local and global variables
    count += 1    # understand expression

    print('Custom shirt size "' + size + '" with text "' +
             msg + '" printed on "' + location + '"')
    # understand how to format output and work with multiple quotations

def get_total_order():
    return "total order: " + str(count) + " shirts"   # understanding of data type


custom_shirt("M", "I'm awesome", "back")
custom_shirt("M", "I'm awesome")
custom_shirt("M")
custom_shirt(size="M", msg="I'm awesome", location="back")
custom_shirt(size="M", msg="I'm awesome")
custom_shirt(size="M")
custom_shirt(msg="I'm awesome", size="M", location="back")
custom_shirt(msg="I'm awesome", size="M")
custom_shirt(size="M", location="back")

print(get_total_order())