C0103

Message

Invalid %s name "%s"

Invalid constant name "newline"
Invalid variable name "MyVar"
Invalid class name "myClass"
...

Description

Verbose name: invalid-name

Used when a name doesn't doesn't fit the naming convention associated to its type (constant, variable, class…).
This message belongs to the basic checker.

Explanation

PyLint raises this message when an object has a name that doesn't fit the naming convention associated to its object type.

The naming convention is defined with a regular expression, and the naming convention is satisfied if the name matches the regular expression. The regular expression syntax is the normal Python regular expression syntax, as used in Python raw strings (e.g. r"abc").

Options can be used to override the default regular expression associated to each type. The table below lists the types, their associated options, and their default regular expressions.

Type	Option	Default regular expression
Argument	argument-rgx	[a-z_][a-z0-9_]{2,30}$
Attribute	attr-rgx	[a-z_][a-z0-9_]{2,30}$
Class	class-rgx	[A-Z_][a-zA-Z0-9]+$
Constant	const-rgx	(([A-Z_][A-Z0-9_]*)|(__.*__))$
Function	function-rgx	[a-z_][a-z0-9_]{2,30}$
Method	method-rgx	[a-z_][a-z0-9_]{2,30}$
Module	module-rgx	(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
Variable	variable-rgx	[a-z_][a-z0-9_]{2,30}$
Variable, inline1	inlinevar-rgx	[A-Za-z_][A-Za-z0-9_]*$

1. Used as part of list comprehensions and generators.

In addition, the following options are related to naming conventions:

1. The good-names option defines names that are always accepted, even if the regular expression associated to its type does not match.
2. The bad-names option defines names that are always rejected (see C0102), even if the regular expression associated to its type matches.

Options that are not really related to naming conventions, but to names:

1. The bad-functions option defines the names of built-in functions that should not be used (see W0141).

---

what about simple string variables not intended to be changed

Douglas Goodall 07 Nov 2018 15:04

Being new to pylint, I have a lot to learn.

Please can someone with more experience give me some guidance?

I have a line of code which sets a string variable from a call to a class method.
The string is not intended to be modified within the scope of the function.

PRIKEY = p_database.get_key()

I made it upper case because it won't be changed.

C0103 says it doesn't comply with snake_case.

Do I really have to make it PRI_KEY to be snaky enough?