自动将字符串转换为正确的数字类型

Question

I was wondering if there's an elegant and easy way to convert a string (that I know can be converted to a number) to the corresponding numerical type. For example, if my string represents an integer, I want the value converted to int ; same for long , float , and so on.

Answer 1

You could use ast.literal_eval .

import ast

examples = ["1", "1.5", "999999999999999999999999999999999999999999", "23+42j"]
for item in examples:
    result = ast.literal_eval(item)
    print result
    print type(result)

Result:

1
<type 'int'>
1.5
<type 'float'>
999999999999999999999999999999999999999999
<type 'long'>
(23+42j)
<type 'complex'>