a= '"This is test string"'    # strip()会默认去除'\n','\r','\t',' ',制表回车换行和空格等字符
a.strip('"')
> 'This is test string'

b = ' This is another string '  #首尾两个空格
b.strip(' ')
>'This is another string'
b.strip()
>'This is another string'   # 默认去除

c = '*This is an-another string/'  # 首尾两个字符
c.strip('*/')  #这里strip将解析每一个字符，检查首尾是否存在，存在就去除返回
>'This is an-another string'

d = '//This is the last string**'
d.strip('*/')
> d = 'This is the last string'  # 持续去除首尾的指定字符符号

e = 'einstance'
e.strip('e')             # 去除首尾特定字符
> 'instanc'

a = ' example '
a.rstrip()   #同样默认去除末尾的空格\n,\t,\r
>' example'
b = 'this is mya'
b.rstrip('a') #去除末尾特定字符
>'this is my'

a = ' example '
a.lstrip()   #默认去除开头的空格\n,\t,\r
>'example '
b = 'athis is mya'
b.lstrip('a') #去除末尾特定字符
>'this is mya'

# 使用字符串replace()方法，将目标字符替换为空
a = 'this is the test'
a.replace('t','')
>'his is he es'

#第二种方法使用正则表达式方法
import re
re.sub('s','', a)
>'thi i the tet'

a = ' "This is a good example" ' 
eval(a)
>`This is a good example`
b = '    "This is a good example" ' 
eval(b)
>'This is a good example'