Is there a “not equal” operator in Python?
Use !=. See comparison operators. For comparing object identities, you can use the keyword is and its negation is not. e.g.
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How can I install pip on Windows?
Python 2.7.9+ and 3.4+ Good news! Python 3.4 (released March 2014) and Python 2.7.9 (released December 2014) ship with Pip. This is the best feature of any Python release. It makes the community’s wealth of libraries accessible to everyone. Newbies are no longer excluded from using community libraries by the prohibitive difficulty of setup. In shipping with a package … Read more
Removing duplicates in lists
The common approach to get a unique collection of items is to use a set. Sets are unordered collections of distinct objects. To create a set from any iterable, you can simply pass it to the built-in set() function. If you later need a real list again, you can similarly pass the set to the list() function. The following example should cover whatever you … Read more
How can I implement a tree in Python?
I am trying to construct a General tree. Are there any built-in data structures in Python to implement it?
How do I install pip on macOS or OS X?
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. I spent most of the day yesterday searching for a clear answer for installing pip (package manager for Python). I can’t find a good solution. How do I install it?
Print string to text file
It is strongly advised to use a context manager. As an advantage, it is made sure the file is always closed, no matter what: This is the explicit version (but always remember, the context manager version from above should be preferred): If you’re using Python2.6 or higher, it’s preferred to use str.format() For python2.7 and higher … Read more
How to make a flat list out of a list of lists
Given a list of lists t, which means: is faster than the shortcuts posted so far. (t is the list to flatten.) Here is the corresponding function: As evidence, you can use the timeit module in the standard library: Explanation: the shortcuts based on + (including the implied use in sum) are, of necessity, O(T**2) when there are T sublists — as the intermediate … Read more
What is the necessity of plt.figure() in matplotlib?
The purpose of using plt.figure() is to create a figure object. The whole figure is regarded as the figure object. It is necessary to explicitly use plt.figure() when we want to tweak the size of the figure and when we want to add multiple Axes objects in a single figure. Parts of a Figure
How do you get the logical xor of two variables in Python?
If you’re already normalizing the inputs to booleans, then != is xor.
Pip freeze vs. pip list
When you are using a virtualenv, you can specify a requirements.txt file to install all the dependencies. A typical usage: The packages need to be in a specific format for pip to understand, which is That is the “requirements format”. Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x). If you … Read more