Bad variable names can increase costs
Constants
(([A-Z_][A-Z0-9_]*)|(__.*__))
- underscore allowed
- upercase
- anything delimited with double underscore
Note : a constant is an identifier that is assigned at only one time in a function, method or global scope, with a literal value (number, string or list)
Variables
[a-z_][a-z0-9_]
- underscore allowed
- lowercase
Note : a variable is an identifier that is assigned at least one time in a function, method or global scope.
PI = 3.14 # (constant because assigned only one time in root scope) CONST1 = [item1, item2] # (constant because initialized with a literal list CONST2 = "this is a string" # (constant because initialized with a literal string my_var = 10 # (variable because assigned later in same scope)
class toto:
def meth() :
CONST3 = 100 # (constant because assigned only one time in meth() scope)
var = 10 # (variable because assigned later)
print 'yo'
var = 5
my_var2 = var # (variable because not initialized with a literal
PI=5 # (variable because assigned two times in "meth()" scope)
print(PI)
PI = PI_0
my_var = 5
Why you should care
The name of the variable or constant does match the naming convention. This error is a stylistic warning. The code will execute. But you can improve the readability of the code by renaming the variable or constant to match the following regular expression:
- Variables:
[a-z_][a-z0-9_]$ - Constants:
(([A-Z_][A-Z0-9_]*)|(__.*__))$
Business Impacts
CAST recommendations
References
https://www.quantifiedcode.com/knowledge-base/maintainability/Avoid%20using%20%22non-Pythonic%22%20variable%20names/4m6i5Dpz
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