>>>name='Al'>>>age=4000>>>'My name is %s. I am %s years old.'%(name,age)'My name is Al. I am 4000 years old.' Python 3.6 引入了f-strings,除了用大括号代替了%s,表达式直接放在大括号里面,与字符串插值类似。像原始字符串一样,F 字符串在起始引号前有一个f前缀。在交互式 Shell 中输...
data={"name":"Alice","age":30}# 写入JSONtry:withopen("data.json","w")asf:json.dump(data,f)except IOErrorase:print(f"文件写入失败: {e}")# 读取JSONtry:withopen("data.json","r")asf:loaded_data=json.load(f)except json.JSONDecodeErrorase:print(f"JSON解析错误: {e}") 对于嵌套结...
-c cmd : program passed in as string (terminates option list) -d : debug output from parser (also PYTHONDEBUG=x) -E : ignore environment variables (such as PYTHONPATH) -h : print this help message and exit [ etc. ] 1. 2. 3. 4. 5. 6. 7. 8. 9. 我们在写shell脚本时,经常会...
# Filename: while.py number=23 running=True whilerunning: guess=int(input('Enter an integer : ')) ifguess==number: print('Congratulations, you guessed it.') running=False# this causes the while loop to stop elifguess<number: print('No, it is a little higher than that') else: print...
# Filename: using_name.py if __name__ == '__main__': print('This program is being run by itself') else: print('I am being imported from another module') 1. 2. 3. 4. 5. 6. 7. 8. 9. 输出: $ python using_name.py ...
using System;publicclassHappyProgram{publicstaticvoidMain(){ Console.WriteLine("Enter a number: ");intYourNumber=Convert.ToInt16(Console.ReadLine());if(YourNumber >10) Console.WriteLine("Your number is greater than ten");if(YourNumber <=10) Console.WriteLine("Your number is ten or smaller"...
Age is 22Phone is 1234567890Data type of argument: <class 'dict'>name is louisEmail is a@gmail.comCountry is WakandaAge is 25▍28、解释re模块的split()、sub()、subn()方法?split():只要模式匹配,此方法就会拆分字符串。 sub():此方法用于将字...
HereisalistofthePythonkeywords.Enteranykeywordtogetmorehelp. Falseclassfromor Nonecontinueglobalpass Truedefifraise anddelimportreturn aselifintry assertelseiswhile asyncexceptlambdawith awaitfinallynonlocalyield breakfornot helpquit 图1-8利用help命令查阅关键字 ④Python对大小写敏感,也就是说对于标识符,Py...
似乎是因为有int(age),所以输入字母就报错了。使用变量active 来控制循环结束的时机。 7-5 重写: prompt = "\nTell us your age:" prompt += "\nEnter 'quit' to end the program.\n\t" active = True while active: age = input(prompt) if age != 'quit': age = int(age) if age < 3...
使用f-stringname="Alice"age=30greeting=f"My name is {name} and I am {age} years old."...