If Python doesn’t have a ternary conditional operator, is it possible to use other language constructs to simulate one? 3 31 Yes, It was added in version 2.5. The expression syntax is: a if condition else b First condition is evaluated, then exactly one of either a or b is evaluated and returned based on … Read more
What does this do? [python]if __name__ == "__main__": print("Hello world!") [/python] 40 Short It’s boilerplate code that protects users from accidentally invoking the script when they didn’t intend to. Here are some common problems when the guard is omitted from a script: If you import the guardless script in another script (e.g. import … Read more
Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. without enough detail may be edited or deleted. What is the use of the yield keyword in Python? What does it do? For example, I’m trying to understand this code1: def _get_child_candidates(self, distance, … Read more
I have a Django view that processes a GET request. I want to rebuild the query string to include all variables except for one. I was initially using list comprehension: >>> from django.http import QueryDict >>> q = QueryDict(‘a=2&b=4&c=test’) // <— make believe this is request.GET >>> z = QueryDict(”).copy() >>> z.update(dict([x for x in … Read more
This is probably a simple question that I am just missing but I have two lists containing strings and I want to “bounce” one, element by element, against the other returning the index of the matches. I expect there to be multiple matches and want all of the indices. I know that list.index() gets the … Read more
I’m trying to check if a list has no member as boolean operator AND, OR, NOT. I use: while (‘AND’ and ‘OR’ and ‘NOT’) not in list: print ‘No boolean operator’ However, when my input is: a1 c2 OR c3 AND, it prints ‘No boolean operator’, which means this list is considered no boolean operator … Read more
Hi Stack Overflow users, I’ve encountered a frustrating problem, can’t find the answer to it. Yesterday I was trying to find a way to HIDE a subprocess.Popen. So for example, if i was opening the cmd. I would like it to be hidden, permanently. I found this code: kwargs = {} if subprocess.mswindows: su = … Read more
My current algorithm to check the primality of numbers in python is way to slow for numbers between 10 million and 1 billion. I want it to be improved knowing that I will never get numbers bigger than 1 billion. The context is that I can’t get an implementation that is quick enough for solving … Read more
I am writing a python win32 service below are snippet of my code when i compile the service it works but i need to go to services.msc and start it manually. Is there an option when i install the serivce by : myservice.exe install it will starts automaticly ? below are snippet of my code … Read more
I’ve got a Django app serving a webpage with an HTML5 element. There’s a wierd “feature”, turning the video element to be non-seekable: video.seekable returns a timeRanges object with length=0, whereas it should be length=1. This means I can’t edit the video. JavaScript can’t do anything either. The thing is, when I upload the problematic … Read more
