I want to use eval in the middle of the following python statement: but because it does not return any value (it works in an “in place” manner), I cannot actually use it there and instead I receive an error of TypeError: can only concatenate list (not “NoneType”) to list . Is there any…
Tag: python-3.x
How can I print another version of the board without actually changing it?
Suppose the and I want to have a function that print the board in a readable version which would be like This method does not change the actual board. It prints ‘X’ for 1, ‘O’ for 2, and empty space (‘ ‘) for 0. Answer You can use a translation dictionary and a nested list …
How can show the singleton object’s attribution?
We can show instance’s attribution with dir function. Now create a class with metaclass method: Show Cls’s _instances attrubution: Why no string _instances in dir(Cls)? Answer Because it’s stored on the metaclass. To be clear, this has nothing to do with the singleton aspect.
Find all shortest paths between all pairs of nodes in NetworkX
I am trying to get all shortest paths between all pairs of nodes in an undirected unweighted graph. I am currently using nx.all_pairs_shortest_path(), but I don’t understand why it only returns one shortest path for every pair of nodes. There are cycles in my graph so there should exist multiple shortes…
Please help me use the selection description to write a program that displays the corresponding four seasons according to the month entered by the use [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question Please use the selection description to write a program that displays the corresponding four …
How to write a django orm-like module?
I am trying to write a orm package which source data is json, First I created a Department class (I am trying to mimic django model) Then I created Organization class as a search manager. My expected result is: But I have no idea how to achieve it, can anybody help me? Answer If you want to access the parent
What is the easiest way to get the url a link redirects to?
I have a number of urls that redirect to other ones and I would like to find the address of the links they redirect to. For example, https://stlouisfed.org/fomcspeak/thomas-barkin/2019/04/apr-speech-a-practitioners-perspective-on-the-productivity-slowdown redirects to https://www.richmondfed.org/press_room/sp…
Convert a pandas df to defaultdict and look for matching positive and negative numbers
I have a dataframe like this: What i want to do know i convert the df into a defaultdict and look for only the matching matching positive and negative numbers per id so i want my desired dict to look something like this: I try to do this below but i get this error: Any idea how to solve this
How do I implement Dash/Plotly checklist persistence on a layout with multiple unique graphs?
My dashboard has a 2 x 2 graph layout with one checklist overlaid on each graph. Each graph requires a unique ID, to be live-updated via callbacks. These IDs are generated in a loop (e.g., graph-BMW, graph-MB, etc.). Similarly, each checklist has a unique ID generated via the same loop (e.g., checklist-BMW, c…
Accessing M-values associated to LINESTRING M and MULTILINESTRING M geometries
How can I access a line geometry’s multiple M-values? Consider that the line geometry in question can be either a LINESTRING M or MULTILINESTRING M geometry that was created using osgeo/ogr. Here’s a small reproducible example: In the example above, the line_geom and mline_geom objects are success…