Kivy“对象没有属性"错误 [英] Kivy 'object has no attribute' Error
问题描述
我是python和Kivy编程的新手,因此遇到了麻烦,可能在这里问了一个简单的问题,但现在对我来说是一个很大的障碍. 我正在用Kivy开发GUI.我有一些TextInputs获得数值.在所有文本输入之后,我有一个确定"按钮,该按钮将获取所有值并进行处理. 从.kv文件中的同一类调用函数时出现错误.
main.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kv文件
# File name: jwelkreator.kv
#:kivy 1.7.0
<JwelKreator>:
AnchorLayout:
anchor_x: 'left'
anchor_y: 'top'
MyLayout:
id: _tool_box
size_hint: None,0.75
width: 300
...
...
simpleForm.py 用于文本输入.
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.kv TextInput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,属性为发生错误".
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 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.有什么我想念的吗?
@eyllanesc:根据您的建议,我已从我的kv类名称中删除了@BoxLayout.从main.kv调用MyLayout时,我的主.kv文件出现错误
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>
问题
您将得到 AttributeError:'MyLayout'对象没有属性'print_something' ,因为它找不到函数 print_something .>
解决方案
有关详细信息,请参阅说明,示例和输出.
说明
jwelkreator.py
- 从simpleForm导入MyLayout添加
- 删除 Builder.load_file('simpleForm.kv')
jwelkreator.kv
添加#:include simpleForm.kv 以包含外部奇异文件.
包括一个外部kivy文件.这样,您就可以将复杂的小部件拆分为它们自己的文件.
simpleForm.py
由于您已在kv文件中定义了动态类,因此不必定义动态类 LblTxt(BoxLayout) .
仅通过此规则的声明创建的此类继承自Button类,并允许我们更改其默认值并为其所有实例创建绑定,而无需在Python端添加任何新代码.
simpleform.kv
由于在Python脚本simpleForm.py中,您已经定义了MyLayout是BoxLayout的类,因此您无需在kv文件中继承它.替换< MyLayout @ BoxLayout>与< MyLayout>
示例
jwealkreator.py
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()
jwealkreator.kv
# File name: jwelkreator.kv
#:kivy 1.10.0
#:include simpleform.kv
<JwelKreator>:
anchor_x: 'left'
anchor_y: 'top'
MyLayout:
id: _tool_box
size_hint: None,0.75
width: 300
simpleForm.py
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()
simpleform.kv
#: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
后显示Hello
I'm new to python and Kivy programming so getting trouble and may be asking simple question here, but its a big hurdle for me now. I am developing a GUI with kivy. I have some TextInputs which get numeric value. after all text inputs , I have a 'OK' button which gets all value and process them. I'm getting error in calling the function from same class in .kv file.
main.py file:
# 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()
main kv file
# File name: jwelkreator.kv
#:kivy 1.7.0
<JwelKreator>:
AnchorLayout:
anchor_x: 'left'
anchor_y: 'top'
MyLayout:
id: _tool_box
size_hint: None,0.75
width: 300
...
...
simpleForm.py for text inputs.
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.kv TextInput Layout
<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()
While I press 'OK' button, attribute Error Generated.
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'
I am stuck here and not getting way to solve it. Is there anything I'm missing?
EDIT: @eyllanesc: as per your suggestion, I've removed @BoxLayout from my kv class name. I'm getting error from my main .kv file as I'm calling MyLayout from main.kv
MyLayout:
id: _tool_box
size_hint: None,0.75
width: 300
ERROR:
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>
Problem
You are getting AttributeError: 'MyLayout' object has no attribute 'print_something' because it cannot find the function, print_something.
Solution
Please refer to the explanations, example and output for details.
Explanations
jwelkreator.py
- Add from simpleForm import MyLayout
- Remove Builder.load_file('simpleForm.kv')
jwelkreator.kv
Add #:include simpleForm.kv to include an external kivy file.
include <file> - Kivy Language
Includes an external kivy file. This allows you to split complex widgets into their own files.
simpleForm.py
You don't have to define the dynamic class, LblTxt(BoxLayout) since you have it defined in your kv file.
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.
simpleform.kv
Since in the Python script, simpleForm.py, you have already defined class MyLayout is of BoxLayout, you don't to inherit it in the kv file. Replace <MyLayout@BoxLayout> with <MyLayout>
Example
jwealkreator.py
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()
jwealkreator.kv
# File name: jwelkreator.kv
#:kivy 1.10.0
#:include simpleform.kv
<JwelKreator>:
anchor_x: 'left'
anchor_y: 'top'
MyLayout:
id: _tool_box
size_hint: None,0.75
width: 300
simpleForm.py
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()
simpleform.kv
#: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()
Output
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