字符串去除空白 ,strip() ， 包括空格，tab键， 换行符
>>> name = ” frank ”
>>> name.strip()
‘frank’
字符串的分割， split(“分隔符”)，分组后成为一个列表
>>> name = “apple, banbana, orice”
>>> name.split(“,”)
[‘apple’, ‘ banbana’, ‘ orice’]
>>>
字符串的合并 join(“连接符”)
>>> name = [‘frank’, ‘marlon’, ‘lee’]
>>> “|”.join(name)
‘frank|marlon|lee’
判断空格是否子字符串中 “in”
>>> name = “frank bain”
>>> ” in name
true
>>> “l” in name
false
>>>
两种字符串格式化打印形式 format
# 第一种表示方法
>>> msg = “hello {name}, your age is {age}”
>>> msg.format(name=”frank”, age=24)
‘hello frank, your age is 24’
>>>
# 第二种表示方法 ，注意index 从0 开始
>>> msg = “hello{0}, your age is {1}, sex is {2}”
>>> msg.format(“frank”, 24, “man”)
‘hellofrank, your age is 24, sex is man’
>>>
字符串的判断
>>> name = “frank”
>>> name.upper()
‘frank’
>>> name.lower()
‘frank’
>>> name.startswith(“f”)
true
>>> name.endswith(“k”)
true
>>> name.endswith(“a”)
false