函数参数 -Python 语言程序设计-17332344.pptx

Python语言程序设计【函数参数】主讲老师：施莉莉

PythonLanguageProgramming[FunctionParameters]Lecturer:ShiLili

知识点【函数参数】函数的参数分类：1.必需参数2．默认参数3．关键字参数4.不定长参数5.匿名函数中的参数

KnowledgePoints[FunctionArguments]Classificationofargumentstofunctions：1.Requiredparameters2.Defaultparameters3.Keywordparameters4.Indefinitelengthparameters5.Parametersinanonymousfunctions

知识点【函数参数】1.必需参数指的是函数要求传入的参数，调用时必须以正确的顺序传入，并且调用时的数量必须和声明时一致，否则会出现语法错误。【例】带必需参数的函数sayHello1234567defsayHello(name):

print(Hello!+name)

return

#调用sayHello函数

sayHello(DerisWeng)

sayHello()调用sayHello(“DerisWeng”)Hello!DerisWeng调用sayHello()报错!!!

[FunctionArguments]1.Requiredparametersreferstothefunctionrequiredtopassparameters,thecallmustbepassedinthecorrectorder,andthenumberofcallsmustbeconsistentwiththedeclaration,otherwisetherewillbesyntaxerrors.[Example]SayHellofunctionwithrequiredparameters1234567defsayHello(name):

print(Hello!+name)

return

#CallthesayHellofunction

sayHello(DerisWeng)

sayHello()CallsayHello(DerisWeng)Hello!DerisWengCallsayHello()ErrorReporting!!!!KnowledgePoints

知识点【函数参数】2.默认参数指的是当函数中的参数设置了默认值，在调用函数时，如果没有给该参数传递任何值，则函数将会使用默认值。【例】带默认参数的函数sayHello1234567defsayHello(name,times=1):

print((Hello!+name)*times)

return

#调用sayHello函数

sayHello(DerisWeng)

sayHello(DerisWeng,3)调用sayHello(“DerisWeng”)Hello!DerisWeng调用sayHello(“DerisWeng”,3)Hello!DerisWengHello!DerisWengHello!DerisWeng

[FunctionArguments]2.thedefaultparametersmeansthatwhenadefaultvalueissetforaparameterinafunction,thefunctionwillusethedefaultvalueifnovalueispassedtotheparameterwhenthefunctioniscalled.[Example]ThefunctionsayHellowithdefaultparameters1234567defsayHello(name,times=1):

print((Hello!+name)*times)

return

#CallthesayHellofunction

sayHello(DerisWeng)

sayHello(DerisWeng,3)CallsayHello(DerisWeng)Hello!DerisWengCallsayHello(DerisWeng,3)Hello!DerisWengHello!Deri