Let’s Learn: eval() in Python

The eval() expression is a very powerful built-in function of Python. It helps in evaluating an expression. The expression can be a Python statement, or a code object.
For example:
>>> eval("9 + 5")
>>> x = 2
>>> eval("x + 3")
Here, eval() can also be used to work with Python keywords or defined functions and variables. These would normally be stored as strings.
For example:
>>> type(eval("len"))

Without eval()

>>> type("len")

You are given an expression in a line. Read that line as a string variable, such as var, and print the result using eval(var).
#Python3 Solution by VK
N = input()
class C:
def m(N):
return eval(N)
if __name__ == "__main__":
j = C()
except IOError as e:
print("I/O error({0}): {1}".format(e.errno, e.strerror))

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