I have an array and I want to find the indices of the element s that meet two conditions i.e. I can use numpy.nonzero(a>3) or numpy.nonzero(a<8) but not numpy.nonzero(a>3 and a<8) which gives the error: When I try to use any or all I get the same error. Is it possible to combine two conditional tests to get the ans?
Percentage chance to make action
Simple problem: How can I write some_function, or an expression involving percentage_chance, in order to solve this problem? Answer You could use random.random:
How do I catch a specific HTTP error in Python?
I have but what I end up is catching any kind of HTTP error. I want to catch only if the specified webpage doesn’t exist (404?). Answer Python 3 Python 2 Just catch HTTPError, handle it, and if it’s not Error 404, simply use raise to re-raise the exception. See the Python tutorial. Here is a complete example for Python
Actual meaning of ‘shell=True’ in subprocess
I am calling different processes with the subprocess module. However, I have a question. In the following code: and Both work. After reading the docs, I came to know that shell=True means executing the code through the shell. So that means in absence, the process is directly started. So what should I prefer for my case – I need to
Mac OS X Python GUI Administrator Prompt
I have an OS X Python application that uses wxPython for it’s GUI controls. I’m looking to prompt the user for administrative rights (akin to using the Authorization Service API in Objective-C) before starting a network service. The closest library I have found is Bob Ippolito’s Authorization library but it is fairly outdated and has compatibility issues with Snow Leopard
__getattr__ for static/class variables
I have a class like: Whenever MyClass.Foo or MyClass.Bar is invoked, I need a custom method to be invoked before the value is returned. Is it possible in Python? I know it is possible if I create an instance of the class and I can define my own __getattr__ method. But my scnenario involves using this class as such without
Find and replace string values in list [duplicate]
This question already has answers here: Apply function to each element of a list (4 answers) Closed 5 months ago. The community reviewed whether to reopen this question 5 months ago and left it closed: Original close reason(s) were not resolved I got this list: What I would like is to replace [br] with some fantastic value similar to <br
How do I make Python remember settings?
I wrote the beautiful python example code below. Now how do I make it so when I exit then restart the program it remembers the last position of the scale? Edit: I tried the following code But get the following error Answer Write the scale value to a file and read it in on startup. Here’s one way to do
“assert” statement with or without parentheses
Here are four simple invocations of assert: Note that the last one does not raise an error. What is the difference between calling assert with or without parenthesis that causes this behavior? My practice is to use parenthesis, but the above suggests that I should not. Answer The last assert would have given you a warning (SyntaxWarning: assertion is always
How do I get the client IP of a Tornado request?
I have a RequestHandler object for incoming post()s. How can I find the IP of the client making the request? I’ve browsed most of RequestHandler’s methods and properties and seem to have missed something. Answer RequestHandler.request.remote_ip (from RequestHandler’s instance) you can inspect the response like: