You can use **kwargs to let your functions take an arbitrary number of keyword arguments (“kwargs” means “keyword arguments”): You can also use the **kwargs syntax when calling functions by constructing a dictionary of keyword arguments and passing it to your function: The Python Tutorial contains a good explanation of how it works, along with … Read more
I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using jayrambhia’s script found here. It installed version 2.4.5. When I try import cv2 in a Python program, I get the following message: The file cv2.so is stored in /usr/local/lib/python2.7/site-packages/… There are also folders in /usr/local/lib called python3.2 … Read more
os.walk returns a generator, that creates a tuple of values (current_path, directories in current_path, files in current_path). Every time the generator is called it will follow each directory recursively until no further sub-directories are available from the initial directory that walk was called upon. As such, So or this or if you want to look … Read more
The purpose of meshgrid is to create a rectangular grid out of an array of x values and an array of y values. So, for example, if we want to create a grid where we have a point at each integer value between 0 and 4 in both the x and y directions. To create … Read more
In python the with keyword is used when working with unmanaged resources (like file streams). It is similar to the using statement in VB.NET and C#. It allows you to ensure that a resource is “cleaned up” when the code that uses it finishes running, even if exceptions are thrown. It provides ‘syntactic sugar’ for … Read more
I installed anaconda into my computer using python. After I install the software, I found there is one program called anaconda prompt. What is the difference between anaconda prompt and command prompt? If I want to update the package, which one I should use or either one. Like (conda update conda) Thank you
I have the following DataFrame (df): I add more column(s) by assignment: How can I move the column mean to the front, i.e. set it as first column leaving the order of the other columns untouched?
Your code produced an empty response body, you’d want to check for that or catch the exception raised. It is possible the server responded with a 204 No Content response, or a non-200-range status code was returned (404 Not Found, etc.). Check for this. Note: There is no need to use simplejson library, the same … Read more
The mile-high overview is this: When you leave the nested block, Python automatically calls f.close() for you. It doesn’t matter whether you leave by just falling off the bottom, or calling break/continue/return to jump out of it, or raise an exception; no matter how you leave that block. It always knows you’re leaving, so it … Read more
Try import bs4. It’s unfortunate there’s no correspondence between PyPI package name and import name. After that the class names are the same as before eg. soup = bs4.BeautifulSoup(doc) will work. If that still doesn’t work, try pip install again and note the path to the package install. Then in your python console run import … Read more