How can you write a function f that takes another function g as an argument, but where function g has arguments that change dynamically depending on what happens in function f? A pseudocode example would be: So when i iterates, function f is called with a new argument i every time. How could that be implement…
Tag: syntax
Dataframe conditions syntax
I have a mystery error on line 13 of this program. I’m trying to select all the times between 22.00 and 23.00. I’ve tried with and without datetime, with and without apostrophes, but I get the same error every time: “SyntaxError: invalid syntax” The csv file is 8 columns and ‘com…
Tricks and tips for beginners to shorten and simplify code
I am looking for ways to shorten and simplify my python code. Here is one example of one small rock/paper/scissors game I wrote earlier. The code kinda looks too long to me and I want to try to learn how to shorten my code. Answer Yes. You could simplify your logic by having compound and/or tests for the play…
Run Loop If Value Does Not Exist in Database
#update – I fixed the syntax error moving a ), but it still doesn’t work as intended. Now it runs the loop even with a duplicate, which is not the intent. I’m trying to add a list of quotes to a database, but only if the author doesn’t already exist. I’m getting a syntax error he…
Syntax for nested dictionaries in Python
I’m developing Python scripts for the automated grading of assignments using CanvasAPI, an API wrapper in Python for the Canvas learning management platform. In studying the documentation, I can successfully issue curl commands in Python for a few parameters. For example, this conversion below is for up…
How Does the Multiple Return Syntax Work?
I have a problem where I want to return a value based on a result. But to accomplish that, I would need to have multiple return statements like this: But I saw someone syntax like this: So, I am not sure how the second piece of code works. Can you please explain it? Thanks! Answer Second method is clever but
Factor out the name of the dataframe in python pandas to get better to read mathematical expressions
If you do for example mathematical operations with columns of a python pandas dataframe (call it data), you repeatedly have to write data do access the columns, which is very annoying, if you want nice to read mathematical formulas. So I am looking for a way to “factor out” the data keyword. Consi…
Python Re.Sub Function Usage Issue
I need help with this re.sub function. For example, if I wanted to replace “string” with “abc” but I want #include <string.h> to remain the same so that the syntax does not get disturbed and all the other “string” variables get replaced with “abc”. How can…
Python syntax: Could colons be optional when at end of line?
I would like to understand whether it would be possible to change the syntax of Python making the colons of compound statements optional when they are at the end of the line, apart from whitespace and comments. E.g.: Would this change break existing Python code? Would there be ambiguous constructs? Would the …
How to make a nested for loop using a generator in python?
I’m trying to convert this nested for loop: to a one liner, something like this: But I’m getting this error: all_R is a defaultdict where every value has keys that are pairs, and I’m interested in just one value from that pair: Answer List comprehensions are written in the same order as for …