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Reserved words in python language

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Release: 2022-06-07 14:51:51
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Identifiers in Python are names used to identify variables, functions, classes, modules, and other objects. Identifiers can contain letters, numbers, and underscores (_), but they must start with a non-numeric character. The alphabet consists only of A–Z and a–z in the ISO-Latin character set.

Reserved words in python language

Identifiers are case-sensitive, so FOO and foo are two different objects. Special symbols, such as $, %, @, etc., cannot be used in identifiers. In addition, words such as if, else, for, etc. are reserved words and cannot be used as identifiers. (Recommended learning: Python video tutorial)

The following table lists all reserved characters and their descriptions:

##class is used to define the classcontinueContinue to execute the next loopdef is used to define functions or methodsdelDelete the value of a variable or sequenceelifConditional statements and if else is used in conjunction with elseConditional statement. Conditional statement is used in conjunction with if and elif. It can also be used for exceptions and loops##exceptexceptexecforfinallyfromglobalifimportin#islambdanotorpassprintraisereturntrywhilewithyield

Identifiers that start or end with an underscore usually have special meaning. For example, an identifier starting with an underscore (such as _foo) cannot be imported using the from module import * statement. Identifiers preceded and followed by two underscores, such as __init__, are reserved for special methods. Identifiers preceded by two underscores, such as __bar, are used to implement class private attributes. In general, similar identifiers should be avoided.
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Reserved words
Description
and
is used for expression operations, logical AND Operation
as
for type conversion
assert
Assertion, used to determine whether the value of a variable or conditional expression is true
break
Interrupt the execution of the loop statement













Including the operation code after catching the exception, used in combination with try and finally


is used to execute python statements


Loop statement


is used for exception statements. After an exception occurs, the code block contained in finally must always be executed. Used in combination with try and except


is used to import modules, used in combination with import


Define global variables


Conditional statements, else, elif Used in combination with


is used to import modules, used in combination with from


Determine whether the variable exists in the sequence


Determine whether the variable belongs to a certain class Example


Define anonymous function


Used for expression operations, logical NOT operations


Used for expression operations, logical OR operations


Placeholder for empty classes, functions, and methods


Print statement


Exception throwing operation


Used to return calculation results from functions


Contains may appear Exception statements, used in combination with except and finally


Loop statement


Simplified Python statements


Used to return values ​​from functions in sequence

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