Kivy'object没有属性'E

Question

我是python和Kivy编程新手，所以遇到麻烦，可能会问一些简单的问题，但现在对我来说这是一个很大的障碍。 我正在用kivy开发一个GUI。我有一些文本输入可以得到数值。在所有的文本输入之后，我有一个“确定”按钮，它获取所有值并处理它们。 从.kv文件中的同一类调用函数时出错。在

主.py文件：

# File name: jwelkreator.py
import kivy
kivy.require('1.7.0')
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.anchorlayout import AnchorLayout

Builder.load_file('simpleForm.kv')
...
...

class JwelKreator(AnchorLayout):
    pass

class JwelKreatorApp(App):
    def build(self):
        return JwelKreator()

if __name__=="__main__":
    JwelKreatorApp().run()

主文件

^{pr2}$

simpleForm.py用于文本输入。在

import kivy

from kivy.app import App
from kivy.lang import Builder
from kivy.config import Config

from kivy.uix.boxlayout import BoxLayout

class LblTxt(BoxLayout):
    pass
class MyLayout(BoxLayout):
    def print_something(self):
        print "Hello"

simpleForm.kvTextInput布局

<LblTxt@BoxLayout>:
    id:LblTxtid
    orientation: 'horizontal'      
    lblTxtIn: 'default'
    theTxt: iAmTxt
    Label:
        text: root.lblTxtIn
        size_hint: 1,0.5
    TextInput:
        id: iAmTxt  
        multiline: False
        hint_text: "numeric only"           
        input_filter: 'int'
        size_hint: 0.5,None
        height: 30
<MyLayout@BoxLayout>:  
    orientation: 'vertical'

    LblTxt:   
        id: lt0
        lblTxtIn: 'Base Layers'

    LblTxt:   
        id: lt1
        lblTxtIn: 'Base exposer time(ms)'

    LblTxt:   
        id: lt2
        lblTxtIn: 'Min Support Height(mm)'

    LblTxt:   
        id: lt3
        lblTxtIn: 'Support Layers'

    LblTxt:   
        id: lt4
        lblTxtIn: 'Support exposer time(ms)'

    LblTxt:   
        id: lt5
        lblTxtIn: 'Job exposer time(ms)'

    Label:
        text:"Number of Layers"
    Button:
        text: 'OK'
        size_hint: 0.5,None
        height: 30
        on_release: root.print_something()

当我按下“确定”按钮时，生成属性错误。在

Traceback (most recent call last):
   File "jwelkreator.py", line 21, in <module>
     JwelKreatorApp().run()
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 600, in run
     runTouchApp()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 454, in runTouchApp
     EventLoop.window.mainloop()
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_pygame.py", line 325, in mainloop
     self._mainloop()
   File "/usr/lib/python2.7/dist-packages/kivy/core/window/window_pygame.py", line 231, in _mainloop
     EventLoop.idle()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 297, in idle
     self.dispatch_input()
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 284, in dispatch_input
     post_dispatch_input(*pop(0))
   File "/usr/lib/python2.7/dist-packages/kivy/base.py", line 253, in post_dispatch_input
     wid.dispatch('on_touch_up', me)
   File "_event.pyx", line 285, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:4184)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/button.py", line 140, in on_touch_up
     self.dispatch('on_release')
   File "_event.pyx", line 281, in kivy._event.EventDispatcher.dispatch (kivy/_event.c:4134)
   File "simpleForm.kv", line 1, in <module>
     <LblTxt@BoxLayout>:
 AttributeError: 'MyLayout' object has no attribute 'print_something'

我被困在这里，没有办法解决它。我有什么遗漏吗？在

编辑： @根据你的建议，我把@BoxLayout从我的kv类名中删除了。当我从调用MyLayout时，我的主.kv文件出错主电压kv在

MyLayout:
            id: _tool_box
            size_hint: None,0.75
            width: 300

错误：

Traceback (most recent call last):
   File "jwelkreator.py", line 21, in <module>
     JwelKreatorApp().run()
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 577, in run
     root = self.build()
   File "jwelkreator.py", line 18, in build
     return JwelKreator()
   File "/usr/lib/python2.7/dist-packages/kivy/uix/anchorlayout.py", line 62, in __init__
     super(AnchorLayout, self).__init__(**kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/layout.py", line 61, in __init__
     super(Layout, self).__init__(**kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/widget.py", line 163, in __init__
     Builder.apply(self)
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 1429, in apply
     self._apply_rule(widget, rule, rule)
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 1534, in _apply_rule
     self._apply_rule(child, crule, rootrule)
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 1496, in _apply_rule
     cls = Factory_get(cname)
   File "/usr/lib/python2.7/dist-packages/kivy/factory.py", line 91, in __getattr__
     raise FactoryException('Unknown class <%s>' % name)
 kivy.factory.FactoryException: Unknown class <MyLayout>

Answer 1

问题

您将得到AttributeError:“MyLayout”对象没有属性“print\u something”，因为它找不到函数，print\u something。在

解决方案

请参阅说明、示例和输出以了解详细信息。在

解释

在jwelkreator.py

1. 从simpleForm import MyLayout添加
2. 移除Builder.load_文件('simpleForm.kv'）

在jwelkreator.kv

添加：包括simpleForm.kv包括一个外部kivy文件。在

include <file> - Kivy Language

Includes an external kivy file. This allows you to split complex widgets into their own files.

在simpleForm.py

您不必定义动态类，LblTxt（BoxLayout），因为您已经在kv文件中定义了它。在

Dynamic Classes - Programming Guide » Kv language

This class, created just by the declaration of this rule, inherits from the Button class and allows us to change default values and create bindings for all its instances without adding any new code on the Python side.

在simpleform.kv

因为在Python脚本中，simpleForm.py，您已经定义了类MyLayout是BoxLayout，您不必在kv文件中继承它。更换<；MyLayout@box布局>；使用<；MyLayout>

示例

在jwealkerator.py在

from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from simpleForm import MyLayout


class JwelKreator(AnchorLayout):
    pass


class JwelKreatorApp(App):

    def build(self):
        return JwelKreator()


if __name__ == "__main__":
    JwelKreatorApp().run()

在jwealkreator.kv在

^{pr2}$

在simpleForm.py在

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout


class MyLayout(BoxLayout):
    def print_something(self):
        print("Hello")


class SimpleFormApp(App):

    def build(self):
        return MyLayout()


if __name__ == "__main__":
    SimpleFormApp().run()

在simpleform.kv在

#:kivy 1.10.0

<LblTxt@BoxLayout>:
    id:LblTxtid
    orientation: 'horizontal'
    lblTxtIn: 'default'
    theTxt: iAmTxt
    Label:
        text: root.lblTxtIn
        size_hint: 1,0.5
    TextInput:
        id: iAmTxt
        multiline: False
        hint_text: "numeric only"
        input_filter: 'int'
        size_hint: 0.5,None
        height: 30

<MyLayout>:
    orientation: 'vertical'

    LblTxt:
        id: lt0
        lblTxtIn: 'Base Layers'

    LblTxt:
        id: lt1
        lblTxtIn: 'Base exposer time(ms)'

    LblTxt:
        id: lt2
        lblTxtIn: 'Min Support Height(mm)'

    LblTxt:
        id: lt3
        lblTxtIn: 'Support Layers'

    LblTxt:
        id: lt4
        lblTxtIn: 'Support exposer time(ms)'

    LblTxt:
        id: lt5
        lblTxtIn: 'Job exposer time(ms)'

    Label:
        text:"Number of Layers"
    Button:
        text: 'OK'
        size_hint: 0.5,None
        height: 30
        on_release: root.print_something()

输出