How to import module when module name has a ‘-‘ dash or hyphen in it?
Starting from Python 3.1, you can use importlib : import importlib foobar = importlib.import_module(“foo-bar”) ( https://docs.python.org/3/library/importlib.html )
How to find the installed pandas version
Check pandas.__version__: In [76]: import pandas as pd In [77]: pd.__version__ Out[77]: ‘0.12.0-933-g281dc4e’ Pandas also provides a utility function, pd.show_versions(), which reports the version of its dependencies as well: In [53]: pd.show_versions(as_json=False) INSTALLED VERSIONS —————— commit: None python: 2.7.6.final.0 python-bits: 64 OS: Linux OS-release: 3.13.0-45-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 … Read more
Does Java have a complete enum for HTTP response codes?
I don’t think there’s one that’s complete in the standard Java classes; HttpURLConnection is missing quite a few codes, like HTTP 100/Continue. There’s a complete list in the Apache HttpComponents, though: org.apache.http.HttpStatus (replaced org.apache.commons.HttpClient.HttpStatus from Apache Http Client, which reached end of life)
Use of “instanceof” in Java [duplicate]
Basically, you check if an object is an instance of a specific class. You normally use it, when you have a reference or parameter to an object that is of a super class or interface type and need to know whether the actual object has some other type (normally more concrete). Example: public void doSomething(Number … Read more
How to style the option of an html “select” element?
There are only a few style attributes that can be applied to an <option> element. This is because this type of element is an example of a “replaced element”. They are OS-dependent and are not part of the HTML/browser. It cannot be styled via CSS. There are replacement plug-ins/libraries that look like a <select> but … Read more
What is the alternative for ~ (user’s home directory) on Windows command prompt?
You’re going to be disappointed: %userprofile% You can use other terminals, though. Powershell, which I believe you can get on XP and later (and comes preinstalled with Win7), allows you to use ~ for home directory.
Sending POST data in Android
Note (Oct 2020): AsyncTask used in the following answer has been deprecated in Android API level 30. Please refer to Official documentation or this blog post for a more updated example Updated (June 2017) Answer which works on Android 6.0+. Thanks to @Rohit Suthar, @Tamis Bolvari and @sudhiskr for the comments. public class CallAPI extends … Read more
Facebook OAuth “The domain of this URL isn’t included in the app’s domain”
In case someone comes across this and is looking for these settings (like I was) You have to On the left hand side, click “+Add Product” and select “Facebook Login” (it was at the top for me) See the new settings available on the left hand side You will now have these OAuth settings on … Read more
Any way to find unused IP addresses on my network?
Probably the best way is to use NMAP (http://nmap.org/) in ARP Ping scan mode. The usage will be something like nmap -sP -PR 192.168.0.* (or whatever your network is). The advantage of this approach is that it uses the Address Resolution Protocol to detect if IP addresses are assigned to machines. Any machine that wants … Read more
How can I recover the return value of a function passed to multiprocessing.Process?
Use shared variable to communicate. For example like this: import multiprocessing def worker(procnum, return_dict): “””worker function””” print(str(procnum) + ” represent!”) return_dict[procnum] = procnum if __name__ == “__main__”: manager = multiprocessing.Manager() return_dict = manager.dict() jobs = [] for i in range(5): p = multiprocessing.Process(target=worker, args=(i, return_dict)) jobs.append(p) p.start() for proc in jobs: proc.join() print(return_dict.values())