So I had to implement a function that reads in data from the opensensemap of arduino and then I should make a diagram with .plot() and show(). The problem is that I get an error that says that the 'index' object has no attribute 'tz_convert'. The code is from university and normally I should not have to change it.
Related
I'm having trouble converting a CNGroup object to a Data object and back to a CNGroup object. I decided to start rethinking the problem again. Somewhere along the way I decided that I should use the Data class to save a CNGroup object to CloudKit. I also learned that the field type to use in my CKRecord object would be of the type bytes.
Am I correct so far?
I am able to convert a CNGroup object to a Data object and back again unless I store the Data object in CloudKit and then retrieve it before I convert the Data object back to a CNGroup object, in which case I get an error when I try to access the pointee property of the typed pointer. That would be an UnsafeBufferPointer, an UnsafeMutableBufferPointer, or an UnsafePointer.
I've tried a lot of different code using different ways. It is impractical to put so much code in my post. I have used the copyBytes method and the withUnsafeBytes method of the Data object.
There is one simple code, and that is when I converted the CNGroup object to a Data object:
func convertCNGroupToData(fromCNGroup group: inout CNGroup) -> Data {
return Data(bytes: &group, count: MemoryLayout.size(ofValue: group))
}
I am looking for a simple way to do what I want. I am relooking at Apple's documentation of Data and NSData.
I am not able to be more specific with this question. I appreciate any effort to help me with this.
I am using Sequelize where I fetch all the data from a table using findAll. Which is basically an Array of objects. What seems to be confusing is that the data I am showing as output nested under objects. (Sounds Confusing? Let me clarify)
So, Let's I have this Short Code
Here if I run this code, it will give me undefine because father lies in parent, for which I have to use user.parent.father, Right?
Okay, now on Fetching data from table in my code,
I console.log my first row, for which I get this.
Now here the values which I need lies in dataValues.
In my ejs file. I am using simple for-of loop
Now my Question is why am I not getting undefined for product.title , product.imageUrl and so on? It is supposed to get those data by product.dataValues.title. Because It lies in another object names dataValues.
Technically, when a value is initialized by Sequelize, your object's prototype is set to Model (the class is too long to copy-paste it here).
When you create your model, Sequelize calls init on it (line 424) and which in turn calls refreshAttributes.
This one calls Object.defineProperty to define both the getter and the setter for each property you have defined in the metadata (line 1238).
The getter and setter are set to get and set functions respectively (lines 1095 to 1103).
This actually means that
instance.field
is just a property wrapped over
instance.get('field')
This corresponds with their docs which says
Instance instances operate with the concept of a dataValues property, which stores the actual values represented by the instance. By default, the values from dataValues can also be accessed directly from the Instance, that is:
instance.field
is the same as
instance.get('field')
is the same as
instance.getDataValue('field')
I have two classes org.my.ClassA and org.my.ClassB both classes are in the same package org.my in the WEB-INF/src in the same database.
ClassA has the method public add(org.my.ClassB newB){...}.
In SSJS I have a code block in which I call ClassA.add(ClassB) which normally works fine. Until some unknown point where the Server can't see that org.my.ClassB === org.my.ClassB and it returns the error (message translated from German maybe looks different in English version):
error calling method 'add(org.my.ClassB)' in java-class 'ClassA'.
'org.my.ClassB' is incompatible with 'org.my.ClassB'.
and it points to my line in the SSJS: ClassA.add(ClassB);
What I tried so far:
First I added the line importPackage(org.my); to my SSJS Code. No luck.
I tried to add another method add(Object newB) and then cast the object to ClassB but same result. The error does not seem to come from the java class its from the SSJS code because it cant find the method with an argument of the type org.my.ClassB. But if I test the object in the SSJS code it returns org.my.ClassB.
Then I tried to add the classpath to all variables in the SSJS block like: var newB:org.my.ClassB = new org.my.ClassB(). But same result after some time the application breaks with the same error.
From my Point of view it got to do something with the caching of compiled classes, or so because if I clear the database everything works just fine again.
Hope someone has a solution on this.
This is a class loader problem.
You can find more details about the issue in the answer from Frantisek Kossuth:
See here more details: Meaning of java.lang.ClassCastException: someClass incompatible with someClass
I am trying to load some object through bytecode modification using asm bytecode instrumentation library.
I am retransforming the classes using retransformClasses() method.
I am loading the objects in this way :
super.visitVarInsn(Opcodes.ALOAD, 0);
super.visitFieldInsn(Opcodes.GETFIELD, owner, name, desc);
super.visitMethodInsn(org.objectweb.asm.Opcodes.INVOKESTATIC,
"com/coolcoder/MyClass",
"objectCheckTest",
"(Ljava/lang/Object;)V");`
The problem is that I the objects are getting loaded using usual tranform() of ClassTransformer , but when I am using Attach API's retranformClasses() , these objects are not getting loaded . Strange thing is that , I am not getting any bytecode error either.
Am I doing something wrong ? or am I missing some intricate part regarding retransform ?
I was be able to solve the issue , though I do not know why it happened in the first place.
(1) I was loading the object only on PUTFIELD or PUTSTATIC opcodes, i.e , when the object value is being set.
(2) Just after bytecode modification the class is getting redefined , as a result of which the code snippet did not work.
(3) Next time when the class loaded due to redefinition , the object is already being set , so it will not be called again.
(4) Now , when I checked for GETFIELD or GETSTATIC opcodes , i.e when the object's value is being retrieved and I loaded it , I was able to view its details.
The same approach which I mentioned above is working fine in usual transformation (i.e running with premain).
Any idea on this erratic behaviour of redefinition ?
First, in manifest.mf file,Can-Retransform-Classes attribute should be true.
And your ClassFileTransformer instance should be add with the true value for parameter canRetransform in method addTransformer .
Here is another additional tips:
If the transformer throws an exception (which it doesn't catch), subsequent transformers will still be called and the load, redefine or retransform will still be attempted. Thus, throwing an exception has the same effect as returning null. To prevent unexpected behavior when unchecked exceptions are generated in transformer code, a transformer can catch Throwable. If the transformer believes the classFileBuffer does not represent a validly formatted class file, it should throw an IllegalClassFormatException; while this has the same effect as returning null. it facilitates the logging or debugging of format corruptions.
from java api docs
So, there maybe some uncatched exception which will be just ignored by the jvm arised.
You can put a try..catch
Please forgive my poor English ...
I have a table with some data that I want to be able to edit through the QTableWidget. Upon trying to connect the currentItemChanged signal:
self.QTableWidget.currentItemChanged(QTableWidgetItem,QTableWidgetItem).connect(self.editCell)
I get the following error:
'TypeError: native Qt signal is not callable'
I went looking in to the QtDesigner, where you can connect signals. I made a QTableWidget, and connected it to a label so that changing the currentItem hid the label.
In the signal connecting dialog the currentItemChanged signal was written thus:
currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)
I don't know what the * means, but I assume it's important.
Am I using the wrong signal or is my syntax wrong somehow? In short, I want there a signal to be emitted upon changing any particular item/cell(I'm not sure what the distinction is)
____________________EDIT_________________________
EDIT: In the QTableWidgetItem class documentation I also found that it has functions column() and row().
I tried adding them like this:
self.QTableWidget.currentItemChanged(QTableWidgetItem.column(QTableWidgetItem.column()),QTableWidgetItem.row()).connect(self.editCell)
But got the error:
TypeError: descriptor 'column' requires a 'PySide.QtGui.QTableWidgetItem' object but received a 'Shiboken.ObjectType
This bit is concerning:
self.QTableWidget
If your table is literally called "QTableWidget" there may be confusion later on. Specifically, the error you are getting makes it look like you are calling QTableWidget.currentItemChanged.
Also, its worth reviewing the PyQT documentation on "new-style signals", specifically on dealing with overloads to understand how it all works. Fortunately however, QTableWidget.currentItemChanged isn't overloaded so, the code you should be using should just be:
self.yourTable.currentItemChanged.connect(self.editCell)
Regarding your later edits, in this code:
currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)
The QTableWidgetItems that are being parsed are arguments that are given to the signal. You can't change them, as they are definined in the method that defines the slot, and passed when the signal is fired. From the documentation linked above:
void currentItemChanged (QTableWidgetItem *,QTableWidgetItem *)
This signal is emitted whenever the current item changes. The previous item is the item that previously had the focus, current is the new current item.