This module is inspired by recipe 276960 and shows how generators can be combined with a pipe-like syntax. A similar approach, using Popen, pipes and Thread, is presented in recipe 576757.
Python, 29 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | class Pipeable( object ):
def _other( self, other ):
self.other = other
def __iter__( self ):
for i in self.other:
yield i
def __or__( self, right ):
right._other( self )
return right
class Filter( Pipeable ):
def __init__( self, filter ):
self.filter = filter
def __iter__( self ):
for line in self.other:
yield self.filter( line )
class Cat( Pipeable ):
def __init__( self, iterable ):
self.other = iterable
class Reverse( Pipeable ):
def __iter__( self ):
for line in self.other:
yield line[::-1]
if __name__ == '__main__':
for line in Cat( ('This', 'is', 'just', 'an', 'example') ) | Reverse() | Filter( lambda str : str[::-1] ):
print line,
|
This is just an hack, but can probably be transformed in an interesting way of combining generators for people used to shell like languages.
