當變量指向 Python 中的 object 時，如何打印變量名

Question

我是 python 和一般編碼的新手。 在下面的代碼中，我如何讓“turn”打印“june”或“july”而不是 <turtle.Turtle object at 0x0405D730>

def main():
    wn = turtle.Screen() #Creates a screen
    #Define your turtles here
    june = turtle.Turtle()
    july = turtle.Turtle()
    june.shape('turtle')
    july.shape('turtle')
    june.color('blue')
    july.color('red')
    july.goto(0, 50) #move second turtle to a different starting location

    turtleTurn()
    turn = turtleTurn()
    if turn == 0:
        turn = june
    else:
        turn = july


    while isInScreen(wn, turn) and sameSpot(june, july):
        if turn == june:
            turn = july
        else:
            turn = june

        turtleMove(turn)
        if isInScreen(wn, turn) == False:
            print("and the winning is ", turn)


    wn.exitonclick()

main()

Answer 1

您可以在每個 Turtle 中存儲一個名稱（在創建它之后）並參考 name 屬性來打印它：

june.name = 'june'
july.name = 'july'
...
print("and the winning is ", turn.name)

Answer 2

您可以通過多種方式做到這一點，其中之一是：

my_var = "sss"

my_var_name = [ k for k,v in locals().items() if v == my_var][0]

print("Variable name is :   ", my_var_name)

在這里，我們創建了一個病毒“my_var”，當我們聲明一個病毒時，他被保存在本地病毒中，你可以使用“locals().items()”來訪問它們，它會返回所有這些。 並且通過 for you 對它們進行迭代，當你找到病毒的 v == 時，你會在“my_var_name”中得到它。

Answer 3

你不能得到變量名本身，至少不容易。 請參閱此處的說明：將變量的名稱作為字符串獲取——kindall 的回答

相反，您可以比較 object 身份並手動打印其名稱：

print("and the winning is", 'july' if turn is july else 'june')

---

盡管物有所值，但最通用的解決方案是使用字典。 請參閱如何創建可變數量的變量？ 例如，從這樣的事情開始：

turtles = {month: turtle.Turtle() for month in ['june', 'july']}

Answer 4

您只需要使用來自python-varname的值包裝器來包裝june和july月：

from varname import Wrapper

def main():
    wn = turtle.Screen() #Creates a screen
    #Define your turtles here
    june = Wrapper(turtle.Turtle()) # <- then, use june.value to access turtle 
    july = Wrapper(turtle.Turtle()) # <- and june/july.name to access the name
    june.value.shape('turtle')
    july.value.shape('turtle')
    june.value.color('blue')
    july.value.color('red')
    july.value.goto(0, 50) #move second turtle to a different starting location

    turtleTurn()
    turn = turtleTurn()
    if turn == 0:
        turn = june
    else:
        turn = july


    while isInScreen(wn, turn.value) and sameSpot(june.value, july.value):
        if turn.value == june.value:
            turn = july
        else:
            turn = june

        turtleMove(turn.value)
        if isInScreen(wn, turn.value) == False:
            print("and the winning is ", turn.name)


    wn.exitonclick()

main()

package 托管在https://github.com/pwwang/python-varname上。

我是 package 的作者。 如果您對使用它有任何疑問，請告訴我。