交互环境下的把数值转化为货币单位

原创于 2014-10-14 02:45:38 发布 · 288 阅读

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本文介绍了一个使用SimpleGUI实现的简单应用程序，该程序能够将数值转换为美元和美分的文字形式，例如输入5.02则输出为5 dollars and 2 cents。通过输入框用户可以输入任意数值进行转换，并在界面上实时显示结果。

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import simplegui
#define global variable
value=5.02
# Handle single quantity
def convert_units(val, name):
    result = str(val) + " " + name
    if val > 1:
        result = result + "s"
    return result
        
# convert xx.yy to xx dollars and yy cents
def convert(val):
    # Split into dollars and cents
    dollars = int(val)
    cents = int(round(100 * (val - dollars)))

    # Convert to strings
    dollars_string = convert_units(dollars, "dollar")
    cents_string = convert_units(cents, "cent")

    # return composite string
    if dollars == 0 and cents == 0:
        return "Broke!"
    elif dollars == 0:
        return cents_string
    elif cents == 0:
        return dollars_string
    else:
        return dollars_string + " and " + cents_string
#define a input_handler
def input_handler(text):
    global value
    value=float(text)
#define a draw_handler
def draw(canvas):
    canvas.draw_text(convert(value),[60,110],24,"White")
    
    
#create a frame 
frame=simplegui.create_frame("Convert",400,200)
# register event handler
frame.set_draw_handler(draw)
frame.add_input("enter value",input_handler,100)
#start frame
frame.start()