a= '"This is test string"'    # strip()會默認去除'\n','\r','\t',' ',制表回車換行和空格等字符
a.strip('"')
>>> 'This is test string'

b = ' This is another string '  #首尾兩個空格
b.strip(' ')
>>>'This is another string'
b.strip()
>>>'This is another string'   # 默認去除

c = '*This is an-another string/'  # 首尾兩個字符
c.strip('*/')  #這里strip將解析每一個字符，檢查首尾是否存在，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'  # 持續(xù)去除首尾的指定字符符號

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

a = ' example '
a.rstrip()   #同樣默認去除末尾的空格\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()   #默認去除開頭的空格\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，將目標字符替換為空
a = 'this is the test'
a.replace('t','')
>>>'his is he es'

#第二種方法使用正則表達式方法
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'