Equivalent to matlab’s imagesc in matplotlib? [duplicate]
You want the extent kwarg See Imshow: extent and aspect for a more detailed example.
python
python numpy machine epsilon
An easier way to get the machine epsilon for a given float type is to use np.finfo():
Python OpenCV2 (cv2) wrapper to get image size?
cv2 uses numpy for manipulating images, so the proper and best way to get the size of an image is using numpy.shape. Assuming you are working with BGR images, here is an example: In case you were working with binary images, img will have two dimensions, and therefore you must change the code to: height, … Read more
Test Average and Grade – Python
To have it print the letter grade as a user enters a score you can do something like: The letter grade problem was that you were using total which was all the grades added up (hopefully more than 100 if you got at least a 20 on all 5 assignments), so it would always default … Read more
Is it possible to forward-declare a function in Python?
If you don’t want to define a function before it’s used, and defining it afterwards is impossible, what about defining it in some other module? Technically you still define it first, but it’s clean. You could create a recursion like the following: Python’s functions are anonymous just like values are anonymous, yet they can be … Read more
How to install PyQt4 on Windows using pip?
Here are Windows wheel packages built by Chris Golke – Python Windows Binary packages – PyQt In the filenames cp27 means C-python version 2.7, cp35 means python 3.5, etc. Since Qt is a more complicated system with a compiled C++ codebase underlying the python interface it provides you, it can be more complex to build … Read more
What does an ‘r’ represent before a string in python?
r means the string will be treated as raw string. See the official Python 2 Reference about “String literals”: When an ‘r’ or ‘R’ prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r”\n” consists of two characters: a backslash and a lowercase ‘n’. String quotes can be … Read more
NameError: name ‘get_ipython’ is not defined
You have to run your script with ipython: Then get_ipython will be already in global context. Note: Importing it via from IPython import get_ipython in ordinary shell python will not work as you really need ipython running.
Can I put a tuple into an array in python?
One thing to keep in mind is that a tuple is immutable. This means that once it’s created, you can’t modify it in-place. A list, on the other hand, is mutable — meaning you can add elements, remove elements, and change elements in-place. A list has extra overhead, so only use a list if you need to modify … Read more
Homebrew brew doctor warning about /Library/Frameworks/Python.framework, even with brew’s Python installed
I had the same problem. When I upgraded python3 through Homebrew, I started getting this: I had the same conflict with Python somehow being installed in /Library/Framework/Python.framework. I just did a brew link overwrite and everything is working fine now. There is some info about what to do with the Python version in the /Library/Framework/Python.framework here. I guess you could … Read more