Sebastian> we want extract numbers from strings and wonder if there is
Sebastian> already a module around for doing this. An example in our
Sebastian> case would look like this:
Sebastian> 0.032 +/- 0.5 x 10(-4)
Sebastian> it would even be helpful to have a routine which does not
Sebastian> recognise the +/- , but at least the 10(-4).
How about the tokenize module?
>>> import tokenize
>>> lines = ["0.032 +/- 0.5 x 10(-4)\n"]
>>> def readline():
... if lines:
... line = lines.pop(0)
... return line
... return ""
...
>>> tokenize.tokenize(readline)
1,0-1,5: NUMBER '0.032'
1,6-1,7: OP '+'
1,7-1,8: OP '/'
1,8-1,9: OP '-'
1,10-1,13: NUMBER '0.5'
1,14-1,15: NAME 'x'
1,16-1,18: NUMBER '10'
1,18-1,19: OP '('
1,19-1,20: OP '-'
1,20-1,21: NUMBER '4'
1,21-1,22: OP ')'
1,22-1,23: NEWLINE '\n'
2,0-2,0: ENDMARKER ''
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