Chapter 2 - Variables and Simple Data Types

2-1 Simple message : Store a message in a variable and print it out.

1 message="Hello,world!"
2 print(message)

output:

Hello,world!

2-2 Multiple simple messages: store a message in a variable and print it out; then modify the value of the variable to a new message and print it out.

1 message="Hello,world!"
2 print(message)
3 message="Hello,python world!"
4 print(message)

　output:

 
          Hello,world! 
         
          Hello,python world!

2-3 Personalized message: Store the user's name in a variable and display a message to that user. The displayed message should be as simple as "Hello Eric, would you like to learn some Python today?".

1 name='Eric'
2 message="Hello "+name+",would you like to learn some Python today?"
3 print(message)

output:

1 Hello Eric,would you like to learn some Python today?

2-4 Adjust the case of the name: Store a person's name in a variable, and then display the person's name in lowercase, uppercase, and initial capital.

1 name= ' Eric ' 
2  print (name.lower()) #Each letter is lowercase 
3  print (name.upper()) #Each letter is uppercase 
4  print (name.title()) #First letter is uppercase

output:

1 eric
2 ERIC
3 Eric

2-5 名言：找一句你钦佩的名人说的名言，将这个名人的姓名和他的名言打印出来。输出应类似于下面这样（包括引号）： Albert Einstein once said, “A person who never made a mistake never tried anything new.”

1 message='Albert Einstein once said,"A person who never made a mistake never tried anything new."'
2 print(message)

输出：

Albert Einstein once said,"A person who never made a mistake never tried anything new."

2-6 名言2：重复练习2-5，但将名人的姓名存储在变量famous_person 中，再创建要显示的消息，并将其存储在变量message 中，然后打印这条消息。

1 famous_person='Albert Einstein'
2 message=famous_person+' once said,"A person who never made a mistake never tried anything new."'
3 print(message)

输出：

1 Albert Einstein once said,"A person who never made a mistake never tried anything new."

2-7 剔除人名中的空白：存储一个人名，并在其开头和末尾都包含一些空白字符。务必至少使用字符组合"\t" 和"\n" 各一次。打印这个人名，以显示其开头和末尾的空白。然后，分别使用剔除函数lstrip() 、rstrip() 和strip() 对人名进行处理，并将结果打印出来。

1 name='  Eric  ' #两边分别空两个空格
2 print(name)
3 print("\t"+name) #'\t'制表符
4 print("\n"+name) #'\n'换行符
5 print(name.rstrip()) #删除右边空白
6 print(name.lstrip()) #删除左边空白
7 print(name.strip()) #删除两边空白

输出：

1       Eric  
2 
3   Eric  
4   Eric
5 Eric  
6 Eric

2-8 数字数字8：编写4个表达式，它们分别使用加法、减法、乘法和除法运算，但结果都是数字8。为使用print 语句来显示结果，务必将这些表达式用括号括起来，也就是说，你应该编写4行类似于下面的代码：输出应为4行，其中每行都只包含数字8。

1 print(5+3)
2 print(10-2)
3 print(2*4)
4 print(16/2)
5 print(2**3) #2的3次方

输出：

2-9 最喜欢的数字：将你最喜欢的数字存储在一个变量中，再使用这个变量创建一条消息，指出你最喜欢的数字，然后将这条消息打印出来。

1 num='8'
2 message="My favorite number is "+num+' .'
3 print(message)

输出：

My favorite number is 8 .

Chapter 2 - Variables and Simple Data Types

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