Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "copyright", "credits" or "license()" for more information.

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IDLE 2.6.5      
>>> s = "ATGATGCATATATCACCCCGGTAT"
>>> s.find("TATC")
10
>>> s[10:]
'TATCACCCCGGTAT'
>>> s.replace("G","C")
'ATCATCCATATATCACCCCCCTAT'
>>> import re
>>> s = "ATAT AGGGC CATA C TG "
>>> s.strip()
'ATAT AGGGC CATA C TG'
>>> re.sub(r"[\s]","",s)
'ATATAGGGCCATACTG'
>>> s = "hi Hello hi howdy Hello yo Hello hiya"
>>> hit = s.find("Hello")
>>> hit
3
>>> s[3:].find("Hello")
0
>>> s[3+len("Hello":].find("Hello")
  
SyntaxError: invalid syntax
>>> s[3+len("Hello"):].find("Hello")
10
>>> s[10+len("Hello"):].find("Hello")
3
>>> s
'hi Hello hi howdy Hello yo Hello hiya'
>>> s.find("Hello")
3
>>> s = s[3+len("Hello"):]
>>> s
' hi howdy Hello yo Hello hiya'
>>> s.find("Hello")
10
>>> s = s[10+len("Hello"):]
>>> s
' yo Hello hiya'
>>> s.find("Hello")
4
>>> s = s[4+len("Hello"):]
>>> s
' hiya'
>>> s.find("Hello")
-1
>>> a = 3
>>> b = 3
>>> c = 3
>>> a == b == c
True
>>> a = 2
>>> b =5
>>> c = 7
>>> a< b < c
True
>>> s = "hi Hello hi howdy Hello yo Hello hiya"
>>> import stringsearch
>>> stringsearch.findall(s, "Hello")
[3, 10, 4]
>>> reload(stringsearch)
<module 'stringsearch' from '/home/karmic/Projects/Courses/BmsMinicourse/examples2/stringsearch.py'>
>>> stringsearch.findall(s, "Hello")

Traceback (most recent call last):
  File "<pyshell#38>", line 1, in <module>
    stringsearch.findall(s, "Hello")
  File "/home/karmic/Projects/Courses/BmsMinicourse/examples2/stringsearch.py", line 8, in findall
    hit = s[offset:].find(query) + offset
KeyboardInterrupt
>>> reload(stringsearch)
<module 'stringsearch' from '/home/karmic/Projects/Courses/BmsMinicourse/examples2/stringsearch.py'>
>>> stringsearch.findall(s, "Hello")
[3, 18, 27]
>>> s[3:]
'Hello hi howdy Hello yo Hello hiya'
>>> s[18:]
'Hello yo Hello hiya'
>>> s[27:]
'Hello hiya'
>>>