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This article mainly explains "what are the most common Python interview questions". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what are the most common Python interview questions.

Q: what are the naming rules for Python variables, functions, and classes?

Answer: Python naming conventions play an important role in writing code. Although programs may run without following naming conventions, using naming conventions can provide a more intuitive understanding of what the code represents.

Naming conventions for Python (similar to other programming languages)

(1) it cannot start with a number and cannot appear in Chinese.

(2) the name begins with a letter and contains numbers, letters (case-sensitive), and underscores.

(3) can not contain keywords, see the name to know the meaning.

Let's talk about the naming convention of Python:

1. Class

The first letter of a word is always capitalized, and private classes can begin with an underscore. Such as MyClass.

Class MyClass (): passclass MySchool (): pass

2. Function

Function names are all lowercase, if multiple words are separated by an underscore. In addition, the private function begins with an underscore.

Def my_func (var1, var2): passdef _ private_func (var1, var2): pass

3. Variables

Variable names are preferably lowercase, if multiple are separated by underscores.

Constants are in full uppercase, and multiple words are separated by underscores.

Num = 20this_is_a_variable = 1MAX_NUM = 1000

Additional addition:

Abbreviations:

Full spelling should be used in naming. There are two kinds of abbreviations:

1. Commonly used abbreviations, such as XML, ID, etc., should also be named with only capitalized initials, such as XmlParser.

two。 Names contain long words and abbreviate a word. The conventional abbreviation should be used at this time.

For example:

Function is abbreviated to fn

Text is abbreviated to txt

Object is abbreviated to obj

Count is abbreviated to cnt

Number is abbreviated to num, etc.

Leading suffix underscore

A leading underscore: indicates non-public ownership.

An underscore with a suffix: avoid keyword conflicts.

Two leading underscores: used when naming a class attribute causes a name conflict.

Two prefixes and suffixes are underlined: "demon" (with special graphics) objects or properties, such as _ _ init__ or _ _ file__. Never create such names, but just use them.

Note: there is some controversy about the use of underscores.

Specific naming method

Mainly refers to the system reserved word nomenclature in the form of _ _ xxx__. This naming can also be used in a project, and its significance is that variables in this form are read-only, and class member functions in this form should not be overloaded as much as possible. Such as

Class Base (object):

Def _ init__ (self, id, parent = None):

Self.__id__ = id

Self.__parent__ = parent

Def _ _ message__ (self, msgid):

Among them, _ _ id__, _ _ parent__ and _ _ message__ all adopt the system reserved word naming.

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