how do I convert
b is a string b = '(1,2,3,4)' to b = (1,2,3,4) 7 46209
In <11**********************@g43g2000cwa.googlegroups .com>, querypk wrote: how do I convert b is a string b = '(1,2,3,4)' to b = (1,2,3,4)
In [1]: b = '(1,2,3,4)'
In [2]: b[1:-1]
Out[2]: '1,2,3,4'
In [3]: b[1:-1].split(',')
Out[3]: ['1', '2', '3', '4']
In [4]: tuple(b[1:-1].split(','))
Out[4]: ('1', '2', '3', '4')
Ooops, you wanted ints in there:
In [5]: tuple(map(int, b[1:-1].split(',')))
Out[5]: (1, 2, 3, 4)
Ciao,
Marc 'BlackJack' Rintsch
Pass it to eval: eval('(1, 2, 3, 4, 5)')
(1, 2, 3, 4, 5)
Basically what you are doing it evaluating the repr of the tuple.
-Brett qu*****@gmail.com wrote: b is a string b = '(1,2,3,4)' to b = (1,2,3,4)
py> tuple(int(s) for s in '(1,2,3,4)'[1:-1].split(','))
(1, 2, 3, 4)
Or if you're feeling daring:
py> eval('(1,2,3,4)', dict(__builtins__=None))
(1, 2, 3, 4)
Python makes no guarantees about the security of this second one though.
STeVe bc*****@gmail.com wrote: Pass it to eval:
eval('(1, 2, 3, 4, 5)')
(1, 2, 3, 4, 5)
Just be sure you know where your strings come from. You wouldn't want
someone to pass you
"""__import__('os').system('rm -rf /')"""
and then send that to eval. =)
STeVe
Steven Bethard wrote: Just be sure you know where your strings come from. You wouldn't want someone to pass you """__import__('os').system('rm -rf /')""" and then send that to eval. =)
Why not, Steven? I just tried it and my compu
On Tue, 31 May 2005 13:14:09 -0700, querypk wrote: how do I convert b is a string b = '(1,2,3,4)' to b = (1,2,3,4)
You can do:
def str2tuple(s):
"""Convert tuple-like strings to real tuples.
eg '(1,2,3,4)' -> (1, 2, 3, 4)
"""
if s[0] + s[-1] != "()":
raise ValueError("Badly formatted string (missing brackets).")
items = s[1:-1] # removes the leading and trailing brackets
items = items.split(',')
L = [int(x.strip()) for x in items] # clean up spaces, convert to ints
return tuple(L)
For real production code, you will probably want better error checking.
--
Steven. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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