如何获取函数 on_click 的输出

Question

我计划 return gameMode 的值，因为我想将 gameMode 的输出用于我正在做的游戏，简单中等或困难，但始终存在名称错误。有什么办法可以解决这个问题吗？错误图片：enter image description here

from ipywidgets import Button, HBox

Modes = ['Easy', 'Medium','Hard']

switch = [Button(description=name) for name in Modes]

combined = HBox([items for items in switch])

def upon_clicked(btn):
    gameMode=btn.description.lower()
    for n in range(len(Modes)):
        switch[n].style.button_color = 'gray'
    btn.style.button_color = 'pink'

for n in range(len(Modes)):
    switch[n].on_click(upon_clicked)

display(combined)
gameMode

Answer 1

您需要 return 来自 on_click 处理程序的值或能够设置属性。使用作为基本示例，您可以执行以下操作：

from ipywidgets import widgets, HBox
from IPython.display import display
from traitlets import traitlets

output = widgets.Output()

class LoadedButton(widgets.Button):
    """A button that can holds a value as a attribute."""

    def __init__(self, value=None, *args, **kwargs):
        super(LoadedButton, self).__init__(*args, **kwargs)
        # Create the value attribute.
        self.add_traits(value=traitlets.Any(value))
        self.style.button_color="gray"

buttons = [
    LoadedButton(description="Easy", value="easy"),
    LoadedButton(description="Medium", value="medium"),
    LoadedButton(description="Hard", value="hard")
]
        
def change_btn_color(btn):
    output.clear_output()
    for button in buttons:
        button.style.button_color="gray"
    btn.style.button_color = 'pink'
    with output:
        print(btn.value)

for button in buttons:
    button.on_click(change_btn_color)
    
combined = HBox(buttons)
display(combined, output)

点击按钮后，在下一个单元格中，您可以提取按钮的输出：

print(output.outputs[0]["text"])

我以前从未使用过 ipywidgets，所以希望其他人可以提出更好的解决方案，但这确实有效

如何获取函数 on_click 的输出

How to get the output of function on_click

python

widget

button

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