arguments – Tarik Billa

How to add command line arguments with flags in Python3?

April 12, 2024 by Tarik

The python 3 library includes 3 modules for parsing the command line thus nothing extra to add to your setup. The one you should use is argparse import argparse parser = argparse.ArgumentParser() #-db DATABASE -u USERNAME -p PASSWORD -size 20 parser.add_argument(“-db”, “–hostname”, help=”Database name”) parser.add_argument(“-u”, “–username”, help=”User name”) parser.add_argument(“-p”, “–password”, help=”Password”) parser.add_argument(“-size”, “–size”, help=”Size”, type=int) … Read more

Why am I getting this unexpected keyword argument TypeError?

April 10, 2024 by Tarik

When passing kwargs into a function, it expects to find the exact variable name in the list. If instead your dictionary keys were stringa, integera, and floata the function would work without problem. So you either need to change your function variable names or change the key names in your dictionary to get this to … Read more

Passing a argument to a Scrapy callback function [duplicate]

April 1, 2024 by Tarik

This is what you’d use the meta Keyword for. def parse(self, response): for sel in response.xpath(‘//tbody/tr’): item = HeroItem() # Item assignment here url=”https://” + item[‘server’] + ‘.battle.net/’ + sel.xpath(‘td[@class=”cell-BattleTag”]//a/@href’).extract()[0].strip() yield Request(url, callback=self.parse_profile, meta={‘hero_item’: item}) def parse_profile(self, response): item = response.meta.get(‘hero_item’) item[‘weapon’] = response.xpath(‘//li[@class=”slot-mainHand”]/a[@class=”slot-link”]/@href’).extract()[0].split(“https://stackoverflow.com/”)[4] yield item Also note, doing sel = Selector(response) is a waste … Read more

Why eclipse is generating argument names as arg0,arg1,arg2…. for methods?

January 9, 2024 by Tarik

Eclipse can’t work out the arguments because it can’t find the source or javadoc attachments. Make sure your source is attached. To check, click on the method call readXXX and press F3 which should open the method declaration. If the source is not attached, Eclipse will say “Source not found” and will allow you to … Read more

Actual or formal argument lists differs in length

January 9, 2024 by Tarik

You try to instantiate an object of the Friends class like this: Friends f = new Friends(friendsName, friendsAge); The class does not have a constructor that takes parameters. You should either add the constructor, or create the object using the constructor that does exist and then use the set-methods. For example, instead of the above: … Read more

What does the dplyr period character “.” reference?

January 7, 2024 by Tarik

What happens if I call a function with more arguments than it is defined to accept?

January 7, 2024 by Tarik

JavaScript doesn’t have the concept of a fixed parameter list. For your own functions you can always specify as many parameters as you want and pass in as many as you want which ever type you want. For built-in functions, which correlate to native code, it depends. You asked on what it depends: Let’s look … Read more

How can I pass multiple arguments to a function as a single vector?

January 7, 2024 by Tarik

Getting date of X days ago in bash script, using argument variable

January 6, 2024 by Tarik

It works if ‘ is replaced with ” into this command on the script – STAMP=`date –date=”$1 day ago” +%y%m%d` The clue was the two different character ` and ‘ used in the error response – date: invalid date `$1 day ago’ An expert in bash scripting (not me) can probably explain why this has … Read more

Is it safe to rely on Python function arguments evaluation order? [duplicate]

January 3, 2024 by Tarik

Quoting from the reference documentation: Python evaluates expressions from left to right. So yes, you can count on that (with one exception, see below). A call (the (…) part after a primary, such as a function name) is just another expression primary, and the arguments for the call are just more expressions. Note: There is … Read more