parameters

问题 This is probably a really dumb question, but... if [ ! -n "$1" ], means, if not more than 1 argument do... so I get how it works but what is -n is it the abbreviation of number? I've been reading through The Advanced bash programming guide and they just start using it, I've tried to find it and come up with it must be a "built-in" default parameter, second question is there a command to show default parameter's in Linux. 回答1: The -n argument to test (aka [ ) means "is not empty". The example

问题 This is probably a really dumb question, but... if [ ! -n "$1" ], means, if not more than 1 argument do... so I get how it works but what is -n is it the abbreviation of number? I've been reading through The Advanced bash programming guide and they just start using it, I've tried to find it and come up with it must be a "built-in" default parameter, second question is there a command to show default parameter's in Linux. 回答1: The -n argument to test (aka [ ) means "is not empty". The example

问题 Right now I'm just able to grab the RunTime value inside a class using a ParDo, is there another way to get to use the runtime parameter like in my functions? This is the code I got right now: class UserOptions(PipelineOptions): @classmethod def _add_argparse_args(cls, parser): parser.add_value_provider_argument('--firestore_document',default='') def run(argv=None): parser = argparse.ArgumentParser() pipeline_options = PipelineOptions() user_options = pipeline_options.view_as(UserOptions)

问题 Right now I'm just able to grab the RunTime value inside a class using a ParDo, is there another way to get to use the runtime parameter like in my functions? This is the code I got right now: class UserOptions(PipelineOptions): @classmethod def _add_argparse_args(cls, parser): parser.add_value_provider_argument('--firestore_document',default='') def run(argv=None): parser = argparse.ArgumentParser() pipeline_options = PipelineOptions() user_options = pipeline_options.view_as(UserOptions)

问题 I am attempting to use multiple arrays to pass multiple server names, and maybe other elements, that maybe be needed in conjunction to each other to a function's set of Parameters in a Powershell function. While using a single loop, if that is even possible. I wanted to script this process so you could pass an array via a parameter as a larger function to the 2nd function but use arrays. Instead of nested Hashtable. This is similar to what i was attempting to do but I cant seem to get the

问题 I'm working on developing a custom Java object persistence framework as I recently discussed in this question. One issue I am trying to solve is to force uniform annotation values in constructor parameter and method. Is it possible to know which parameter in constructor was used to set a specific field in class via reflection? For example, if constructor contains parameter String textXYZ and class contains field String textABC and in constructor I do: textABC = textXYZ (so field/parameter

问题 i am a newbie I want to prevent the duplicate usernames every time people do registration. Here is my snipped code: def submit(self): username_info = username.get() username_password = password.get() #connect to db db = mysql.connector.connect(host = 'localhost', user = 'root', password = '', database = 'user') #create a cursor mycursor = db.cursor() #insert to db sql = ("INSERT INTO useraccess (user_type, password) VALUES (%s, %s)") query = (username_info, username_password) mycursor.execute

问题 i am a newbie I want to prevent the duplicate usernames every time people do registration. Here is my snipped code: def submit(self): username_info = username.get() username_password = password.get() #connect to db db = mysql.connector.connect(host = 'localhost', user = 'root', password = '', database = 'user') #create a cursor mycursor = db.cursor() #insert to db sql = ("INSERT INTO useraccess (user_type, password) VALUES (%s, %s)") query = (username_info, username_password) mycursor.execute

问题 i am a newbie I want to prevent the duplicate usernames every time people do registration. Here is my snipped code: def submit(self): username_info = username.get() username_password = password.get() #connect to db db = mysql.connector.connect(host = 'localhost', user = 'root', password = '', database = 'user') #create a cursor mycursor = db.cursor() #insert to db sql = ("INSERT INTO useraccess (user_type, password) VALUES (%s, %s)") query = (username_info, username_password) mycursor.execute

问题 I don't understand why I'm geting these Unpermitted parameter: format messages, I'm doing a JSON request: POST "/questions/add_options.json" with these parameters Parameters: {"id_question"=>551, "options"=>[{"position"=>10, "label"=>"opc 10", "value"=>"opc 10", "go_page"=>nil}], "question"=>{}} and this is what I get in the terminal... Started POST "/questions/add_options.json" for 127.0.0.1 at 2016-08-16 23:12:27 -0300 Processing by QuestionsController#add_options as JSON Parameters: {"id