第二章—变量和简单数据类型

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

 Hello,world!

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

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

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

1 name='Eric'
2 print(name.lower()) #每个字母小写
3 print(name.upper()) #每个字母大写
4 print(name.title()) #首字母大写

1 eric
2 ERIC
3 Eric

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

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

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)

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

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

1       Eric  
2 
3   Eric  
4   Eric
5 Eric  
6 Eric

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

1 8
2 8
3 8
4 8.0
5 8

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

My favorite number is 8 .