Yes, the 0-argument syntax is specific to Python 3, see What’s New in Python 3.0 and PEP 3135 — New Super. In Python 2 and code that must be cross-version compatible, just stick to passing in the class object and instance explicitly. Yes, there are “backports” available that make a no-argument version of super() work … Read more
This is a solution to run an interactive command in subprocess. It uses pseudo-terminal to make stdout non-blocking(also some command needs a tty device, eg. bash). it uses select to handle input and ouput to the subprocess. #!/usr/bin/env python # -*- coding: utf-8 -*- import os import sys import select import termios import tty import … Read more
You can just use image to index into lut if lut is 1D. Here’s a starter on indexing in NumPy: http://www.scipy.org/Tentative_NumPy_Tutorial#head-864862d3f2bb4c32f04260fac61eb4ef34788c4c In [54]: lut = np.arange(10) * 10 In [55]: img = np.random.randint(0,9,size=(3,3)) In [56]: lut Out[56]: array([ 0, 10, 20, 30, 40, 50, 60, 70, 80, 90]) In [57]: img Out[57]: array([[2, 2, 4], … Read more
super() is not broken — it just should not be considered the standard way of calling a method of the base class. This did not change with Python 3.x. The only thing that changed is that you don’t need to pass the arguments self, cls in the standard case that self is the first parameter … Read more
__main__.__file__ doesn’t exist in the interactive interpreter: import __main__ as main print hasattr(main, ‘__file__’) This also goes for code run via python -c, but not python -m.
“你好”.encode(‘utf-8′) encode converts a unicode object to a string object. But here you have invoked it on a string object (because you don’t have the u). So python has to convert the string to a unicode object first. So it does the equivalent of “你好”.decode().encode(‘utf-8′) But the decode fails because the string isn’t valid ascii. … Read more
You should use raw_input instead of input, and you don’t have to call str, because this function returns a string itself: phoneNumber = raw_input(“Please enter a phone number: “)
You can use checkinstall to remove Python. The idea is: Install checkinstall Use checkinstall to make a deb of your Python installation Use dpkg -r to remove the deb. See this post for more details. PS. Note that Ubuntu must always have at least one installation of Python installed, or else major pieces of your … Read more
Root cause Before Python 3.5, backreferences to failed capture groups in Python re.sub were not populated with an empty string. Here is Bug 1519638 description at bugs.python.org. Thus, when using a backreference to a group that did not participate in the match resulted in an error. There are two ways to fix that issue. Solution … Read more
Using pandas it is very simple to read a csv file directly from a url import pandas as pd data = pd.read_csv(‘https://example.com/passkey=wedsmdjsjmdd’) This will read your data in tabular format, which will be very easy to process