Common python string processing and python string processing

Common python string processing and python string processing

S. find (substring, [start [end]) # searches for substrings in the specified range and returns the index value. Otherwise,-1 is returned.

For example

>>> B = 'abc'
>>> B. find ('D ')
3
>>> B. find ('D', 2, 4)
3
>>> B. find ('D', 3,4)
3

>>> B. find ('D', 2, 3)
-1

It can be seen that when a range is specified for search, the specified range is open before closing.

S. index (substring, [start [end]) # Same as find, but the ValueError is not found.

S. count (substring, [start [end]) # returns the number of substrings found.

S. split ('*') # convert string to list and separate it with *. For example:

>>> B = 'abc def ghi'
>>> B. split ('')
['Abc', 'def ', 'ghi']

'*'. Join () # convert list to string and use * to link

For example:

>>> B = 'abc def ghi'
>>> B. split ('')
['Abc', 'def ', 'ghi']
>>> C = B. split ('')
>>> '*'. Join (c)
'Abc * def * ghi'

Other usage is easy to understand and will not be described here