print("Hello Wrold!")
print('Hello Wrold!')

# "" '' 的使用，转义字符\输出;从第一个引号开始到第二个引号结束
print("I'm fine!")
print('I\'m fine!')   #I'm fine!

# title()函数 大写英文句子每个单词的首字母
msg = "Would you want to have a drink?"
msgA = msg.title()
print(msg)        #Would you want to have a drink?
print(msgA)       #Would You Want To Have A Drink?

# upper()函数 大写英文句子所有字母
msgAll_A = msg.upper()
print(msgAll_A)    #WOULD YOU WANT TO HAVE A DRINK?

# lower()函数 小写英文句子所有字母
msgAll_a = msg.lower()
print(msgAll_a)    #would you want to have a drink?

# len()函数 获取字符串长度
length = len(msg)
print(length)      #31    #空格也算字符