of engineers, some mistakes and simplifications for one engineer can become costly for many. For instance it’s particularly important to avoid polluting the global namespace: name collisions across a codebase have significant dependencies. Sometimes it is useful to define a function not bound to a class instance. Such a function can be either a static member or a nonmember function. Nonmember functions should inheritance should be public. If you want to do private inheritance, you should be including an instance of the base class as a member instead. 18 Do not overuse implementation inheritance. Composition

given keys from the Table instance represented by big_table. Silly things may happen if other_silly_variable is not None. Args: 21 big_table: An open Bigtable Table instance. keys: A sequence of strings package_name, ClassName, method_name, ExceptionName, function_name, GLOBAL_CONSTANT_NAME, global_var_name, instance_var_name, function_parameter_name, local_var_name. Names to Avoid • single character names except variables and functions (not included with import * from). Prepending a double underscore (__) to an instance variable or method effectively serves to make the variable or method private to its class (using

initializers) of a class: fields, construc- tors, methods, nested classes, static initializers, instance initializers. 7 • Exception: A blank line between two consecutive fields (having no other code constant case, consider whether the field really feels like a con- stant. For example, if any of that instance’s observable state can change, it is almost certainly not a constant. Merely intending to never