keyword - What is the use case for "pass" in Python? -


this question has answer here:

based on answers this question, pass keyword in python absolutely nothing. indicates "nothing done here."

given this, don't understand use of it. example, i'm looking @ following block of code while trying debug script else wrote:

def dccount(server):     ssh_cmd='ssh user@subserver.st%s' % (server)     cmd='%s "%s"' % (ssh_cmd, sub_cmd)     output=popen (cmd, shell=true, stdout=pipe)     result=output.wait()     queryresult=""     if result == 0:         queryresult = output.communicate()[0].strip()     else:         pass     takedata(server, "dc", queryresult)

is there purpose @ having else: pass here? in way change way function runs? seems if/else block rewritten following absolutely no change:

if result == 0:     queryresult = output.communicate()[0].strip() takedata(server, "dc", queryresult)

... or missing something? and, if i'm not missing something, why ever want use pass keyword @ all?

it indeed useless in example.

it helpful if want block empty, not otherwise allowed python. instance, when defining own exception subclass:

class myexception(exception):     pass

or maybe want loop on iterator side effects, nothing results:

for _ in iterator:     pass

but of time, won't need it.

remember if can add else isn't comment, may not need pass. empty function, instance, can take docstring , work block:

def nop():     """this function nothing, intentionally."""

Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more