Python: eval() function
eval() function
The eval() function is used to evaluate the specified expression. If the expression is a correct Python statement, it will be executed.
Version:
(Python 3)
Syntax:
eval(expression, globals=None, locals=None)
Parameter:
Name | Description | Required / Optional |
---|---|---|
expression | A string as parsed that will evaluated as a Python expression. | Required |
globals | A dictionary | Optional |
locals | A mapping object. | Optional |
Example: Python eval() function
x = 5
print(eval('x+1'))
print(eval('x'))
Output:
6 5
Example: Passing empty dictionary as globals parameter
from math import *
print(eval('dir()', {}))
#Following code will raise an exception
print(eval('sqrt(36)', {}))
Output:
['__builtins__'] Traceback (most recent call last): File "/tmp/sessions/5cb89b87138fc37f/main.py", line 5, in print(eval('sqrt(36)', {})) File "", line 1, in NameError: name 'sqrt' is not defined
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