I want to find “money” in a file and change the string to float , for example, I use regular expression to find “$33,326” and would like to change to [33326.0, “$”] (i.e., remove comma, $ sign and change to float). I wrote the following function but it gives me an error Can…
Tag: python
Python, remove all non-alphabet chars from string
I am writing a python MapReduce word count program. Problem is that there are many non-alphabet chars strewn about in the data, I have found this post Stripping everything but alphanumeric chars from a string in Python which shows a nice solution using regex, but I am not sure how to implement it I’m af…
How to retrieve submitted changelists in a day using Perforce Python API
I am new to Perforce Python API and still finding my way through it. So far I have been able to retrieve changelist information like number, desc etc, if I provide the file name. I am trying to get a list of all the submitted changelists for a specified date/time range so that I can gather information like fi…
Python: Random selection per group
Say that I have a dataframe that looks like: How could I randomly select one (or more) row for each Group_Id? Say that I want one random draw per Group_Id, I would get: Answer
demystify Flask app.secret_key
If app.secret_key isn’t set, Flask will not allow you to set or access the session dictionary. This is all that the flask user guide has to say on the subject. I am very new to web development and I have no idea how/why any security stuff works. I would like to understand what Flask is doing under the h…
Cherrypy base64 image encoding not working as expected
The Problem: I have been playing around with CherryPy for the past couple of days but I’m still having some trouble with getting images to work how I could expect them to. I can save an uploaded image as a jpg without issue but I can’t convert it to a base64 image properly. Here’s the simple…
What is the difference between `sorted(list)` vs `list.sort()`?
list.sort() sorts the list and replaces the original list, whereas sorted(list) returns a sorted copy of the list, without changing the original list. When is one preferred over the other? Which is more efficient? By how much? Can a list be reverted to the unsorted state after list.sort() has been performed? …
Pass a 2d numpy array to c using ctypes
What is the correct way to pass a numpy 2d – array to a c function using ctypes ? My current approach so far (leads to a segfault): C code : Python code: Answer This is probably a late answer, but I finally got it working. All credit goes to Sturla Molden at this link. The key is, note that
Python Terminal/Text UI (TUI) library [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago. Improve this question How can I make a console GUI (more appropriately called TUI) ? It’s …
Python LINQ like methods
As new to Python i really miss LINQ methods. I’ve found this and this questions, which helped me a lot to understand how Python enumerables and generators work. But sill, I want to use good old methods like Select, SelectMany, First, Last, Group, Distinct and so on. I understand, that all cases can be h…