Tip 5 Keep Letter Case Consistent

Pythonic Programming — by Dmitry Zinoviev (13 / 116)

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★2.7, 3.4+ Any Python identifier must start with a Latin letter (“a” through “z” or “A” through “Z”) or an underscore and contain only Latin letters, decimal digits (“0” through “9”), or underscores. It is advised that identifiers are short (to facilitate typing) and descriptive.

Additionally, use all uppercase letters for the so-called constants. Python does not have constants as such. You can change the value of any variable. However, when you spell an identifier in all capital letters, you suggest that the variable’s value should not be changed. Here is a constant:

​ PI = 3.14159 ​# But please use math.pi instead!​

Use identifiers in lowercase, connected with underscores, if necessary, or mixedCase identifiers for variables, functions, and modules. Here are variable, function, and module identifiers:

​ my_cat_s_age = 11
​ myCatSAge = 11
​ _var = ​'I do not care'​
​ ​def​ ​silly_function​():
​     ​pass​
​ ​def​ ​anotherSillyFunction​():
​     ​pass​
​ ​import​ ​myjunk​

Use CapitalizedWords for classes (but not for class objects). Here is a class identifier:

​ ​class​ ADoNothingClass:
​     ​pass​

Readability counts!

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