test.sh#!/bin/bashs1=""iftest$s1;thenecho"lengthisnotzero"elseecho"thelengthis0"fis2="shell"iftest$s2;thenecho"lengthisnot0"elseecho"thelengthis0"fi执行sudo...

 test.sh#!/bin/bashecho"enterthestring:"readfilenameiftest-z$filename;thenecho"thelengthis0"elseecho"thelengthisnot0"fi执行sudochmod+xtest.sh./test.sh输出enter...

 test.sh#!/bin/bashecho"enterthestring:"readfilenameiftest$filename;thenecho"it'snotzero"elseecho"it'szero"fi执行sudochmod+xtest.sh./test.sh输出enterthestring:...

 your_name='runoob'str="Hello,Iknowyouare"$your_name"!"echo$str ...

 #include<iostream>#include<string>usingnamespacestd;classstringfun{charname[20];public:voidconcatString(chara[],charb[]){strcat(a,"");strcat(a...

 importzlibs=b'witchwhichhaswhichwitcheswristwatch'print(len(s))t=zlib.compress(s)print("*******compress*******")print(t)print("")print(len(t))print("*****...

 'teafortoo'.replace('too','two')输出'teafortwo' ...

 importrex=re.findall(r'f[a-z]*','whichfootorhandfellfastest')print(x) ...

 functiontrim(s)return(string.gsub(s,"^%s*(.-)%s*$","%1"))endstring1="RUNOOB"string2=trim(string1)print(string2) ...

 字符串或串(String)是由数字、字母、下划线组成的一串字符。Lua语言中字符串可以使用以下三种方式来表示：单引号间的一串字符。双引号间的一串字符。[[和]]间的一串字符。 实例string1="Lua"print(""字符串1是"",string1)string2='runoob.com'pr...

 mycode='print("helloworld")'code="""defmutiply(x,y):returnx*yprint('Multiplyof2and3is:',mutiply(2,3))"""exec(mycode)exec(code) ...

 defstring_reverse(str1):rstr1=''index=len(str1)whileindex>0:rstr1+=str1[index-1]index=index-1returnrstr1print(string_reverse('1234abcd')) ...

 defmatch_words(words):ctr=0forwordinwords:iflen(word)>1andword[0]==word[-1]:ctr+=1returnctrprint(match_words(['abc','xyz','aba','122771'])) ...

 a='"srting"'print(a)b=eval(a)print(b)输出"srting"srting ...

 fromrandomimportshufflecolor=['1','2','3','4','5']shuffle(color)print(color) ...