Global Variables can easily change module behavior
Why you should care
Avoid global variables in favor of class variables. Some exceptions are:
- Default options for scripts.
- Module-level constants. For example:
PI = 3.14159. Constants should be named using all caps with underscores; see Naming below.
- It is sometimes useful for globals to cache values needed or returned by functions.
- If needed, globals should be made internal to the module and accessed through public module level functions; see Naming below.
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