what is a python identifier

Identifier

Identifier (IDentifier) ​​refers to a symbol used to identify an entity. It has different meanings in different application environments.

In daily life, an identifier is used to specify something or a person. To use it, his or her name; when solving equations in mathematics, we often use this or that Variable name or function name;

In programming languages, identifiers are names used by users when programming. There are also names for variables, constants, functions, and statement blocks; we all call them identifiers.

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1.1 Rules for identifiers

Identifiers consist of letters, underscores and numbers composed, and cannot begin with a number.

Examples are as follows:

   fromNo12
   my_Boolean
   Obj2
   myInt
   test1
   Mike2jack
   My_tExt
   _test
   jack_rose

Error examples are as follows:

   from#12
   my-Boolean
   2ndObj
   test!32
   haha(da)tt
   int
   jack&rose
   G.U.I

Note: Identifiers in Python are case-sensitive.

1.2 Naming Rules

(1) See the name and know the meaning

Choose a meaningful name, Try to know what it means at a glance (to improve code readability). For example: the name can be defined as name, and the student can be defined as student.

(2) Camel case nomenclature

Lower camel case nomenclature: The first word starts with a lowercase letter; the first letter of the second word is capitalized, for example: myName , aDog

upper camel case: The first letter of each word is capitalized, for example: FirstName, LastName

However, there is another nomenclature that is more popular among programmers, which is to use underscore "_" to connect all words, such as send_buf.

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