python零碎基础

str.split(指定以什么分隔（默认空格 换行符等）;哪部分分割（默认全部）)

list = ["守", "望", "先", "锋"]
new_list = "++".join(list)
print(new_list)


输出样例  守++望++先++锋

str_1 = "3.14159265358979323846"
str_1 = str(str_1)
print(str_1.count(‘3‘))

输出 4

str_1 = "3.14159265358979323846"
str_1 = str(str_1)
print(str_1.find(‘3‘))#返回首次出现索引，若没有出现返回-1

输出0

str_1 = "3.14159265358979323846"
str_1 = str(str_1)
print(str_1.index(‘3‘))#返回首次出现索引，若没有出现抛出异常

输出0

str_1 = "3.14159265358979323846"
str_1 = str(str_1)
print(str_1.startswith(‘3‘))#返回True/False      endwith同理

输出True

str.upper()/str.lower()

str_1 = "@#$#@$@#@$"
str_1 = str(str_1)
print(str_1.strip("@"))#删除头尾

输出为  #$#@$@#@$

str.lstrip()/str.rstrip()分别为删除左，删除右