r504 unnecessary variable assignment before return statement

R504 unnecessary variable assignment before return statement. def x (): a = 1 # some code that not using `a` print ('test') return a # error! R505 unnecessary else after return statement. def x (y, z): if y: # error! return 1 else: return z. R506 unnecessary else after raise statement.

R503 missing explicit return at the end of function able to return non-None value. def x (y): if not y: return 1 # error! R504 unnecessary variable assignment before return statement. def x (): a = 1 # some code that not using `a` print ('test') return a # error! R505 unnecessary else after return statement. def x (y, z): if y: # error! return ...

$ ruff test_ruff_ret_504.py Found 1 error(s). test_ruff_ret_504.py:8:12: RET504 Unnecessary variable assignment before `return` statement. ... actionless changed the title False-positive RET504 False-positive RET504 "Unnecessary variable assignment before return statement" Dec 19, 2022. Copy link Contributor. squiddy commented Dec 19, 2022.

flake8-return version used, if any: 1.2.0; Python version, if any: 3.10; Operating System: Windows 11; Description. The application of R504 unnecessary variable assignment before return statement seems wrong here. I've specifically not inlined my return statement in order to have a single return in this "complicated" if-else block.

There is actually a SonarQube rule inherited from PMD called Unnecessary Local Before Return that talks about this. It says: Avoid unnecessarily creating local variables. This rule was later replaced by SSLR rule Variables should not be declared and then immediately returned or thrown, which maintains the same position:. Declaring a variable only to immediately return or throw it is a bad ...

unnecessary-assign (RET504)# Derived from the flake8-return linter. Fix is always available. What it does# Checks for variable assignments that immediately precede a return of the assigned variable. Why is this bad?# The variable assignment is not necessary, as the value can be returned directly. Example#

R502 do not implicitly return None in function able to return non-None value. def x (y): if not y: return # error! return 1. R503 missing explicit return at the end of function able to return non-None value. def x (y): if not y: return 1 # error! R504 unnecessary variable assignment before return statement.

afonasev / flake8-return Goto Github PK View Code? Open in Web Editor NEW 61.0 3.0 71.0 187 KB. Flake8 plugin for return expressions checking. License: MIT License. Python 96.90% Makefile 3.10% flake8-plugin. Introduction · People · Discuss; flake8-return's Introduction

Variable assignment before declaration [duplicate] Ask Question Asked 1 year, 8 months ago. ... Your function should return values that the caller can assign to L, M, and S, if necessary. - chepner. ... The global declaration is unnecessary. Something like this should solve your problem.

Sure, it's got typing issues too - but the code that inspired the above example was actually an attempt to get rid of R504 for a more complex case - where the underlying complexity is in class attribute modifications where adding a new variable doesn't help:

superfluous-else-return (RET505)# Derived from the flake8-return linter.. Fix is sometimes available. What it does#. Checks for else statements with a return statement in the preceding if block.. Why is this bad?# The else statement is not needed as the return statement will always break out of the enclosing function. Removing the else will reduce nesting and make the code more readable.

unnecessary-return-none (RET501)# Derived from the flake8-return linter.. Fix is always available. What it does#. Checks for the presence of a return None statement when None is the only possible return value.. Why is this bad?# Python implicitly assumes return None if an explicit return value is omitted. Therefore, explicitly returning None is redundant and should be avoided when it is the ...

This pattern verifies the presence of variable assignments in conditional (IF) expressions. It is generally not recommended to use the assignment operator in this case as it is close to the comparison operator (==) and could lead to misreading the code logic. ... Use of 'return' statement is not recommended Programming Best Practices. Try ...

Development. No branches or pull requests. 2 participants. Date you used flake8-return: 2019-05-16 flake8-return version used, if any: 1.0.0 Python version, if any: 3.7.1 Operating System: Debian Description The R504 doesn't detect that the variable is conditionally modified prior to return.

That's not a terrible way of looking at it. A crude scheme for determining the return status of a simple command (one not containing ;, &, |, && or || ) is: Scan the line from left to right until you reach the end or a command word (typically a program name). If you see a variable assignment, the return status for the line just might be 0.

R501 ("do not explicitly return None in function if it is the only possible return value."); R502 ("do not implicitly return None in function able to return non-None value."); R503 ("missing explicit return at the end of function able to return non-None value."); R504 ("unnecessary variable assignment before return statement."); R505 ("unnecessary else after return statement.")

1. I have question about unnecessary assignments of variables. I have lot of functions and some of them when they catch exception they will write it into logfile. For example this is one of them (Just rename PC using powershell): try. Runspace rs; rs = RunspaceFactory.CreateRunspace(); rs.Open();

Assigning col outside the function creates the variable, but to be able to write to it inside a function, the global statement needs to be inside each function. btw As a programmer you should try very, very, very hard not to use globals. You should pass variables into functions for them to operate on:

10. No, a return statement is not necessary at the end of a void function (sorry for the C-terms there). If you want to exit a function early, however (say if a specific condition wasn't met), then you'll use a return statement, even if you're not returning a value. Including a return statement at the end of a void function for readability ...