Following the discussion here 
(https://link.getmailspring.com/link/[email protected]/0?redirect=https%3A%2F%2Fbugs.python.org%2Fissue36410&recipient=cHl0aG9uLWlkZWFzQHB5dGhvbi5vcmc%3D)
 I propose to add 3 new string methods: str.trim, str.ltrim, str.rtrim
Another option would be to change API for str.split method to work correctly 
with sequences.

In [1]: def ltrim(s, seq):
...: return s[len(seq):] if s.startswith(seq) else s
...:

In [2]: def rtrim(s, seq):
...: return s[:-len(seq)] if s.endswith(seq) else s
...:

In [3]: def trim(s, seq):
...: return ltrim(rtrim(s, seq), seq)
...:

In [4]: s = 'mailto:[email protected]'

In [5]: ltrim(s, 'mailto:')
Out[5]: '[email protected]'

In [6]: rtrim(s, 'com')
Out[6]: 'mailto:maria@gmail.'

In [7]: trim(s, 'm')
Out[7]: 'ailto:[email protected]'
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