第2章 变量和简单数据模型

2-1简单消息：

1 #2-1 简单消息
2 mesage = 'Hello World'
3 print(mesage)

注意，将变量定义为那一串字符串，字符串是需要引号扩起的

2-2多条简单消息：

#2-2 多条简单消息
mesage = 'Hello World'
print(mesage)

mesage = 'Goodbye World'
print(mesage)

2-3个性化消息：

1 #2-3个性化消息
2 name = 'Cat'
3 mesage = 'Hello '+name+',would you like to learn some Python today?'
4 print(mesage)

2-4调整名字的大小写

1 #2-4调整名字的大小写
2 name = 'cat'
3 print(name.title())
4 print(name.upper())
5 print(name.lower())

2-5名言：

#名言
name = 'Albert Eindtein'
sentence ='said,"A person who never made a mistake never tried anything new. "'
famoussaid=name +' '+sentence
print(famoussaid)

2-6名言2：同上

2-7剔除人名中的空白：

1 #2-7剔除人名中的空白
2 famous_name ='  cat '
3 print(famous_name)
4 print(famous_name.strip())
5 print(famous_name.lstrip())
6 print(famous_name.rstrip())

2-8：数字8：

1 print(5+3)
2 print(1*8)
3 print(8/1)
4 print(9-1)

2-9最喜欢的数字：

1 #2-9最喜欢的数字
2 favourite_num = 3
3 message = "My favourite number is " + str(favourite_num) + "."
4 print(message)

注，调用str函数，将非字符串值表示为字符串