Erforsche Pythons match-case: eine Anleitung zu seiner Syntax, Anwendungen in Data Science und ML sowie eine vergleichende Analyse mit dem traditionellen switch-case.
if语句的一般形式如下所示：if condition_1: statement_block_1elif condition_2: statement_block_2else: statement_block_3 如果 "condition_1" 为 True 将执行 "statement_block_1" 块语句 如果 "condition_1" 为False，将判断 "condition_2"如果"condition_2" 为 True 将执行 "statement_block_2...
Structural pattern matching has been added in the form of a match statement and case statements of patterns with associated actions. Patterns consist of sequences, mappings, primitive data types as well as class instances. Pattern matching enables programs to extract information from complex data type...
"breakifcase():# defaultprint"I dunno what c was!"# As suggested by Pierre Quentel, you can even expand upon the# functionality of the classic 'case' statement by matching multiple# cases in a single shot. This greatly benefits operations such as the# uppercase/lowercase example above:imp...
if<condition>:<statement><statement>else:<statement><statement> 执行过程如下图所示: 如果条件语句< condition >为真,if后面的语句就被执行,如果为假,则执行else下面的语句块。条件语句的格式为:< expr >< relop >< expr >,其中< expr >为表达式、为关系操作符。例如:a >= 10、b != 5等。
但是，在 Python 中，我们看不到 switch-case 或者相近的语法结构，这是为什么呢？2、Python 为什么不支持 switch?官方文档中有一篇 FAQ 包含了这个问题：Why isn’t there a switch or case statement in Python?FAQ 即 Frequently Asked Questions 的缩写，表示常见问题，官方列了 27 个常见问题，完整清单在此...
The Python programming language does not have a built in switch/case control structure as found in many other high level programming languages. It is thought by some that this is a deficiency in the language, and the control structure should be added. This paper demonstrates that not only is...
classPythonSwitchStatement:defswitch(self,month): default="Invalidmonth"returngetattr(self,'case_'+str(month),lambda:default)()defcase_1(self):return"January"defcase_2(self):return"February"defcase_3(self):return"March"defcase_4(self):return"April"defcase_5(self):return"May"defcase_6(self...
statement_block_1elifcondition_2: ## 该分支可选,可以0个或多个 statement_block_2else:## 该分支可选statement_block_3 if 语句包含零个或多个elif子句,及可选的else子句。关键字 'elif' 是 'else if' 的缩写,适用于避免过多的缩进。可以把if...elif...elif... 序列看作是其他语言中switch或case语...
python if condition_1: statement_block_1 elif condition_2: statement_block_2 else: statement_block_3 如果"condition_1" 为 True 将执行 "statement_block_1" 块语句 如果"condition_1" 为False,将判断 "condition_2" 如果"condition_2" 为 True 将执行 "statement_block_2" 块语句 如果"condition_2...