String handling

[snippsat]

In a ordinary loop it would be like this.

>>> string = 'The quick brown fox jumps over the lazy dog. '
>>> characters = 'aeiou'
>>> 
>>> lst = []
>>> for c in string:
...     if c not in characters:
...         lst.append(c)
...         
>>> print(''.join(lst))
Th qck brwn fx jmps vr th lzy dg.

So a list comprehension construct make code over in line.

Can also remove the list as it's make a generator object first.

>>> g = (c for c in string if c not in characters)
>>> g
<generator object <genexpr> at 0x03C8C8B0>

>>> next(g)
'T'
>>> next(g)
'h'

See that there is a small difference no [],and it still work as ''.join() run the generator expressions.

>>> print(''.join(c for c in string if c not in characters))
Th qck brwn fx jmps vr th lzy dg.