Whilest learning Python 3 and converting some of my code from Java to Python 3.3 I came across a small problem I haven't been able to fix.
In Java I have this code (just dummy code to make it smaller):
public enum Mapping {
C11{public int getMapping(){ return 1;}},
C12{public int getMapping(){ return 2;}},
public abstract int getMapping();
}
String s = "C11";
System.out.println(Mapping.valueOf(s))
Works fine and prints the requisted '1'
Trying to do this in Python doesn't work that easy (yet). I tried to imitate an Enum with:
class Mapping:
C11=1
C12=2
s = 'C11'
print(Mapping.Mapping.(magic should happen here).s)
Unfortunately I have no idea how to convert a string to an attribute to be called like that (or something similar).
I need this because I have a HUGE list in the class Mapping and need to convert seemingly random words read from a text file to an integer mapping.
You are looking for getattr:
>>> getattr(Mapping, s)
1
From the documentation:
getattr(object, name[, default])
Return the value of the named attribute of object. name must be a string. If the string is the name of one of the object’s attributes, the result is the value of that attribute. For example, getattr(x, 'foobar') is equivalent to x.foobar. If the named attribute does not exist, default is returned if provided, otherwise AttributeError is raised.
Use getattr:
class Mapping:
C11=1
C12=2
print(getattr(Mapping, 'C11')) # prints 1
Related
i am stucked on something : i have some .idl files that generates java classes from structs defined in those files like this :
struct MapServiceLayer{
string id;
string name;
string parentId;
OsTypes::StringSeq childrenIds;
};
However I need to have a JAVA class where one of it's Attributes needs to be of type Java.Object because when i will instantiate this class, its attribute could be of different type. So i tried this :
struct MapServiceFeatureAttribute{
OsTypes::ObjectSeq value;
};
and this :
struct MapServiceFeatureAttribute{
OsTypes::AnySeq value;
};
But none of those worked.
I also have heard about Unions but i am definitely not sure about how to use them. If someone knows how to get a Java.Object from idls this would be Great. If it's not possible maybe someone knows how to do with unions !
thanks in advance.
After some more deep research it seems that it is not possible to get a java.lang.object. However you can have a behavior that could do the trick using Any corba object :
After having generated your sources you will have a class with an attribute of type Any, this type allows you to store different types in it by using :
Any anyObj;
anyObj.insert_string(String s);
anyObj.insert_long(long l);
anyObj.insert_double(double d);
and you can obviously get the value and the chosen type by using :
String s1 = anyObj.extract_string(String s);
long l1 = anyObj.extract_long(long l);
double d1 = anyObj.extract_double(double d);
i gave the exemple for those 3 types but there is several more.
I recently got a report that a few Google Analytics event category names were being recorded with an i character with out a dot on top.
Pageviews and events occurring twice, once without dots over the i.
I had to look to believe it. Sure enough, I had an event called favorite and there was a handful called favorıte. Copy and paste that weird character into a terminal or a monospace font just to see how weird it is. favorıte
My first suspicion is my code where I generate the strings for the category names using toString on an enum.
public enum AnalyticsEvent {
SCREEN_VIEW,
FAVORITE,
UN_FAVORITE,
CLICK_EVENT,
... reduced for brevity;
public String val() {
return this.toString().toLowerCase();
}
}
Example of how that enum is used:
#Override
public void logSearchTag(String type, String value) {
...
logGAEvent(AnalyticsEvent.SEARCH_TAG.val(), type, value);
}
private void logGAEvent(String category, String action, String label) {
... // mGATracker = instance of com.google.android.gms.analytics.Tracker;
mGATracker.send(addCustomDimensions(new HitBuilders.EventBuilder()
.setCategory(category)
.setAction(action)
.setLabel(label))
.build());
...
}
I am going to solve this by actually assigning a string to the enums and instead return that in the val() function.
Though, I am curious if anyone knows why on a small handful of devices Enum.toString returns the enum name with that weird character replacing the i. I mean small. 8 out 50,000 is the average. Or is it possible that assumption is wrong and the error is on analytics service end somewhere? Really highly doubt that.
The String#toLowerCase method uses the default locale of the system. This use locale specific characters such as ı instead of i. In order to fix this problem call toLowerCase with a locale:
String test = "testString";
test.toLowerCase(java.util.Locale.ENGLISH) // Or your preferred locale
when I am trying to call method with parameter using my Polish language f.e.
node.call("ąćęasdasdęczć")
I get these characters as input characters.
Ä?Ä?Ä?asdasdÄ?czÄ
I don't know where to set correct encoding in maven pom.xml? or in my IDE? I tried to change UTF-8 to ISO_8859-2 in my IDE setting, but it didn't work. I was searching similiar questions, but I didn't find the answer.
#Edit 1
Sample code:
public void findAndSendKeys(String vToSet , By vLocator){
WebElement element;
element = webDriverWait.until(ExpectedConditions.presenceOfElementLocated(vLocator));
element.sendKeys(vToSet);
}
By nameLoc = By.id("First_Name");
findAndSendKeys("ąćęasdasdęczć" , nameLoc );
Then in input field I got Ä?Ä?Ä?asdasdÄ?czÄ. Converting string to Basic Latin in my IDE helps, but It's not the solution that I needed.
I have also problems with fields in classes f.e. I have class in which I have to convert String to basic Latin
public class Contacts{
private static final By LOC_ADDRESS_BTN = By.xpath("//button[contains(#aria-label,'Wybór adresu')]");
// it doesn't work, I have to use basic latin and replace "ó" with "\u00f3" in my IDE
}
#Edit 2 - Changed encoding, but problem still exists
1:
protected static void attSelection_w(Instances data) throws Exception {
AttributeSelection fs = new AttributeSelection();
WrapperSubsetEval wrapper = new WrapperSubsetEval();
wrapper.buildEvaluator(data);
wrapper.setClassifier(new RandomForest());
wrapper.setFolds(10);
wrapper.setThreshold(0.001);
fs.SelectAttributes(data);
fs.setEvaluator(wrapper);
fs.setSearch(new BestFirst());
System.out.println(fs.toResultsString());
}
Above is my code for wrapper based attribute selection using random forest + bestfirst search. However, this somehow spits out a result using cfs, like below.
Search Method:
Greedy Stepwise (forwards).
Start set: no attributes
Merit of best subset found: 0.287
Attribute Subset Evaluator (supervised, Class (nominal): 9 class):
CFS Subset Evaluator
Including locally predictive attributes
There is no other code using CFS in the whole class, and I'm pretty much stuck.. I would appreciate any help. Thanks!
You just inverted the order and get the default method, the correct order is to set the parameter first, then call the selection:
//first
fs.setEvaluator(wrapper);
fs.setSearch(new BestFirst());
//then
fs.SelectAttributes(data);
Just set class Index and add this line after creating instance data
data.setClassIndex(data.numAttributes() - 1);
I checked and it worked fine.
I am moving from C++ to Java, and I am used to the way boost serialization works for xml. What is very good with it is:
that I only have to write one function that is used for both parsing and generating the XML. This function is basically a mapping between the field value and the name of the xml tag.
that the XML generated is light weight, and only contain the information we want to save (no information about the type of the field, the name of the class...)
I am looking for something that would have the same advantages, in JAVA. Here is a C++ example:
struct ContractDefinition
: public fme::ToStringInterface
{
public:
std::string name;
template<class archive>
void serialize(archive& ar, const unsigned int FME_UNUSED(version))
{
using boost::serialization::make_nvp;
ar & make_nvp< std::string >("name", name);
}
};
and the result looks like that:
<name>WHATEVER THE NAME IS</name>
Take a look at jaxb.