判断
result = url.isalpha() #判断是否是字母
result = url.isdigit() #判断是否是数字
result = filename.endswith("doc") #判断结束字符
result = filename.startswith("a") #判断开始字符
查找
string = "sdfsdfsdf asdf"
#find 查找到返回索引，找不到返回-1
result = string.find("/") #str.find(sub, start=0, end=-1)
result = string.lfind("/")
result = string.rfind()
#index 查找到返回索引，找不到返回异常
result = string.index() ##str.index(sub, start=0, end=-1)
result = string.rindex()
result = string.lindex()
替换
#replace() strip() lstrip() rstrip()
#upper() lower() capitalize() title()
#str.replace(old, new, count) -> str
url = url.replace('/','#')
aaa = " sdf asdas ".strip() #去除空格
aaa = " sdf asdas ".lstrip()
aaa = " sdf asdas ".rstrip()
aaa.strip().upper() #变为大写
aaa.strip().lower() #变为小写
aaa.strip().title() #单词首字母大写
aaa.strip().capitalize() #第一个字母大写
分割
#split()
#str.split(sep, maxsplit) -> list
list = url.split("#")
#list[start:end:step] 默认step = 1
#list标号有两套[0,len(list)-1] [-1，-len(list)]
list = [x for x in range(10)]
list1 = list[::-1]
list2 = list[-1:-len(list)-1:-1]
拼接
# join()
# str.join(iterable)
aaa = "-".join(list)
