ungetch in Python
Gabriel Genellina
gagenellina at softlab.com.ar
Wed Dec 24 14:40:10 EST 2003
At 24/12/2003 11:41, you wrote:
>I'm writing a small parser for a minilanguage in Python,
>and I was wondering --- is there any equiv. of C's ungetch
>or Scheme's peek-char in python? That is, is there a way to
No, and neither a getc(), but you can make them easily (provided you just
ungetc *one* char at a time)
(Untested):
class file_with_ungetc(file):
ungetbuffer = None
def ungetc(self, c):
self.ungetbuffer = c
def getc(self):
if self.ungetbuffer is not None:
c=self.ungetbuffer
self.ungetbuffer = None
return c
else:
return self.read(1)
Gabriel Genellina
Softlab SRL
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