python - In python, how to call a function with an argument on a click event

Question

I created the code below, but when I click on the click me button I get the following error message:

TypeError: 'mpfr' object is not callable

Would someone know what is wrong with the code?

import gmpy2 as g
from ipywidgets import widgets
from IPython.display import display

button = widgets.Button(description="Click Me!")
display(button)

max_precision = g.get_max_precision()
pi = g.const_pi()
g.set_context(g.context())

def set_bits_precision(decimal_precision):
    bits_precision = int(decimal_precision/g.log(2))
    if (bits_precision > max_precision): bits_precision = max_precision
    ctx = g.get_context()
    ctx.precision = bits_precision
    return

def square_root(number):
    return g.sqrt(number)

def circle_perimeter(radius):
    return 2*pi*radius 

def on_button_clicked(x):
    return square_root(x)

set_bits_precision(10)
print(pi)
button.on_click(on_button_clicked(2))

Answer 1

button.on_click必须给一个回调函数。您使用参数 2 （因此，字面意思是 2 的平方根）传递评估的结果，而不是传递函数。on_button_clicked您可以使用部分函数评估来做您想做的事，方法是将您的最后一行代码替换为：

import functools
button.on_click(functools.partial(on_button_clicked, 2))