擅长:python、mysql、java
<pre><code># your String
string = 'a3a.b1b2b.cccc.ded.f.g'
# find the last dot character in your string
StringIndex = string.rfind('.')
# create a temporary list of your string and swap the last dot with your preferred string (_Approved.)
temp = list(string)
temp[StringIndex] = '_Approved.'
# replace
string = ''.join(temp)
# print
print('Old String: a3a.b1b2b.cccc.ded.f.g \nNew String: '+ string)
# OUTPUT
# Old String: a3a.b1b2b.cccc.ded.f.g
# New String: a3a.b1b2b.cccc.ded.f_Approved.g
</code></pre>