Python，Kivy，“AssertionError: None is not callable"按钮调用函数时出错

问题描述

所以我想使用此代码在按下按钮时调用函数:

So I whant to use this code to call a function on a button press:

botao_ok.bind(on_press=f_adicionar_socios(txt_n_socio.text,txt_nome.text,txt_filho_de.text,txt_filho_e_de.text,txt_data_nas.text,txt_tipo_ID.text,txt_num_ID.text,txt_NIF.text,txt_morada_rua.text,txt_morada_localidade.text,txt_codigo_postal.text,txt_tel_fixo.text,txt_telemovel.text,txt_email.text,txt_tipo_socio.text,txt_data_admicao.text,txt_zona.text,txt_actividade.text,txt_actividade_de.text,txt_actividade_ate.text,txt_observacoes.text))

但为了简单起见，我只需要解决这个问题:

But to keep it simple, I only need to solve this problem:

#My Function
def teste_(nome):
    print nome
#Button
botao_ok.bind(on_press=teste_('Ola'))
# Button is inside a Class MYApp

它给出了错误:AssertionError: None is not callable

and it gives the error: AssertionError: None is not callable

我已经尝试了所有我强硬的方法但无法解决这个问题......谢谢

Ive tryied everything I tough off and can't solve this...Thank you

推荐答案

当你编写 teste_('Ola') 函数运行并返回 None

When you write teste_('Ola') the function runs and returns None

所以当你写的时候

botao_ok.bind(on_press=teste_('Ola'))

它实际上被设置为:

botao_ok.bind(on_press=None)

简而言之，这是导致您的问题的原因.

Which in short is causing your problem.

为了让它调用 teste_('Ola') 当按钮被按下时，你可以使用 lambda 函数:

In order to get it to call teste_('Ola') When the button is pressed, you could use a lambda function:

botao_ok.bind(on_press=lambda x:teste_('Ola'))

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