Variable number of arguments: This is very useful when we do not know the exact number of arguments that will be passed to a function. Function definition Function call varlengthArgs 30,40,50,60 Now that we have an idea about the different argument types in Python. Writing user-defined functions in Python These are the basic steps in writing user-defined functions in Python.
I will be using the god-send library requests for it. I will write about methods to correctly download binaries from URLs and set their filenames.
Now let's take another example where url is https: What do you think will happen if the above code is used to download it? If you said that a HTML page will be downloaded, you are spot on. This was one of the problems I faced in the Import module of Open Event where I had to download media from certain links.
When the URL linked to a webpage rather than a binary, I had to not download that file and just keep the link as is. To solve this, what I did was inspecting the headers of the URL.
Headers usually contain a Content-Type parameter which tells us about the type of data the url is linking to.
So if the file is large, this will do nothing but waste bandwidth. I looked into the requests documentation and found a better way to do it. That way involved just fetching the headers of a url before actually downloading it. This allows us to skip downloading files which weren't meant to be downloaded.
Getting filename from URL Example - http: However, there are times when the filename information is not present in the url. Example, something like http: In that case, the Content-Disposition header will contain the filename information.
Here is how to fetch it. Use them and test the results. These are my 2 cents on downloading files using requests in Python. Let me know of other tricks I might have overlooked. This article was first posted on my personal blog.Mar 21, · I have the OST file of a user who was terminated 40 days ago.
the president of his division just came to my office and said he needs to see all his email. Trying to overwrite a file in-place is basically impossible, unless you're replacing byte strings with new byte strings of the exact same length. If you replace 'cat_desc' with .
In either case, check if the file exists with arteensevilla.com first. To use a different name, I'd suggest that you append a version number just before the file extension - and if you use an integer value to can check if it exists, and increment it if it does, then recheck.
The ability to check whether a file exists on disk or not is important for many types of Python programs: Maybe you want to make sure a data file is available before you try to load it, or maybe you want to prevent overwriting an existing file.
Python contains excellent built-in tools for both multiprocessing and threading, so adjusting the code to use several threads was fairly trivial. A Foolish Consistency is the Hobgoblin of Little Minds. One of Guido's key insights is that code is read much more often than it is written.
The guidelines provided here are intended to improve the readability of code and make it consistent across the wide spectrum of Python code.