python - Should I use `__setattr__`, a property or...? -


i have object 2 attributes, file_path , save_path. unless save_path explicitly set, want have same value file_path.

i think way __setattr__, following:

class class(): ...     def __setattr__(self, name, value):         if name == 'file_path':             self.file_path = value             self.save_path = value if self.save_path == none else self.save_path         elif name == 'save_path':             self.save_path = value

but looks it's going give me infinite loops since __setattr__ called whenever attribute set. so, what's proper way write above , avoid that?

this looks kind of unpythonic. can use attributes. 3 lines of code:

>>> class class: ...     def __init__(self, file_path, save_path=none): ...         self.file_path=file_path ...         self.save_path = save_path or file_path ...  >>> c = class('file') >>> c.file_path 'file' >>> c.save_path 'file'  >>> c1 = class('file', 'save') >>> c1.file_path 'file' >>> c1.save_path 'save' >>>

Comments

Post a Comment

Popular posts from this blog

jOOQ update returning clause with Oracle -

according http://www.jooq.org/doc/3.8/manual/sql-building/sql-statements/update-statement/ jooq doesn't support returning clause in update statements databases except firebird , postgres. does know, still correct oracle jooq? according oracle's documentation, oracle db supports returning clase delete, insert, or update statements. incorrect manual you're right - manual wrong , should fixed: https://github.com/jooq/jooq/issues/5470 single row update returning jooq 3.8 added support single row update .. returning statements. internally, uses callablestatement , pl/sql block of form: begin update "my_table" set "my_table"."column" = 'xyz' "my_table"."id" = 1 returning "my_table"."id", "my_table"."column" ?, ?; ? := sql%rowcount; end; the relevant issue is: https://github.com/jooq/jooq/issues/5190 multi row update returning a...
Read more

c# - Json.Net Serialize String from URI -

currently i'm using web request body of webpage strictly json. var request = webrequest.create("urihere"); string text; var response = (httpwebresponse)request.getresponse(); using (var sr = new streamreader(response.getresponsestream())) { text = sr.readtoend(); } now i've got string of json in variable i'm trying figure out how parse data. i'm attempting use json.net below: user primaryuser = new models.user(); primaryuser.fullname = "test"; jsonserializer serializer = new jsonserializer(); serializer.converters.add(new javascriptdatetimeconverter()); serializer.nullvaluehandling = nullvaluehandling.ignore; using (streamwriter sw = new streamwriter("filenamehere")) using (jsonwriter writer = new jsontextwriter(sw)) { serializer.serialize(writer, primary...
Read more

java - Warning equals/hashCode on @Data annotation lombok with inheritance -

i have entity inherits other. on other hand, i'm using lombok project reduce boilerplate code, put @data annotation. annotation @data inheritance produces next warning: generating equals/hashcode implementation without call superclass, though class not extend java.lang.object. if intentional, add '@equalsandhashcode(callsuper=false)' type. is advisable add annotation @equalsandhashcode (callsuper = true) or @equalsandhashcode (callsuper = false) ? if not added, 1 callsuper=false or callsuper=true ? the default value false . 1 if don't specify , ignore warning. yes, recommended add @equalsandhashcode annotation on @data annotated classes extend else object. cannot tell if need true or false , depends on class hierarchy, , need examined on case-by-case basis. however, project or package, can configure in lombok.config call super methods if not direct subclass of object. lombok.equalsandhashcode.callsuper = call for configuration system ...
Read more