Converting a string to a tuple in python

问题

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!

回答1:

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.

回答2:

Use ast.literal_eval():

>>> import ast
>>> tc='(107, 189)'
>>> tc_tuple = ast.literal_eval(tc)
>>> tc_tuple
(107, 189)
>>> tc_tuple[0]
107

回答3:

You can use the builtin eval, which evaluates a Python expression:

>>> tc = '(107, 189)'
>>> tc = eval(tc)
>>> tc
(107, 189)
>>> tc[0]
107

来源：https://stackoverflow.com/questions/23173916/converting-a-string-to-a-tuple-in-python