Okay, I have this string
tc='(107, 189)'
and I need it to be a tuple, so I can call each number one at a time.
print(tc[0]) #needs to output 107
Thank you in advance!
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3 Answers
All you need is ast.literal_eval:
>>> from ast import literal_eval
>>> tc = '(107, 189)'
>>> tc = literal_eval(tc)
>>> tc
(107, 189)
>>> type(tc)
<class 'tuple'>
>>> tc[0]
107
>>> type(tc[0])
<class 'int'>
>>>
From the docs:
ast.literal_eval(node_or_string)Safely evaluate an expression node or a Unicode or Latin-1 encoded string containing a Python expression. The string or node provided may only consist of the following Python literal structures: strings, numbers, tuples, lists, dicts, booleans, and None.
Comments
Use ast.literal_eval():
>>> import ast
>>> tc='(107, 189)'
>>> tc_tuple = ast.literal_eval(tc)
>>> tc_tuple
(107, 189)
>>> tc_tuple[0]
107
Comments
You can use the builtin eval, which evaluates a Python expression:
>>> tc = '(107, 189)'
>>> tc = eval(tc)
>>> tc
(107, 189)
>>> tc[0]
107
3 Comments
rboy
Well, this builtin function exists for a reason, and I think if the OP problem is specific for that kind of expressions, it gets the job done flawlessly and requires no imports.
SethMMorton
I'm always confused about why people are against imports. I don't think I've ever written a python script that did not require me to import at least
sys or os.rboy
Usually imports are not bad.. but if I can solve a specific problem using the builtins, I'd prefer that. But anyway, note that import (including when importing only few items from the module), actually evaluates the entire module, and maybe, in some rare cases, you may want to avoid that (though, usually it doesn't really matter, and you won't feel any difference).