python_evaluation.py

# 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")
# 14
# >>> x = 2
# >>> eval("x + 3")
# 5
# 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"))
# <type 'builtin_function_or_method'>

# Without eval()

# >>> type("len")
# <type 'str'>
# Task 
# 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).

# NOTE: Python2 users, please import from __future__ import print_function.

# Constraint 
# Input string is less than 100 characters.

# Sample Input

# print(2 + 3)
# Sample Output
# 5

# Problem's link: https://www.hackerrank.com/challenges/python-eval #

from __future__ import print_function

expression = raw_input().strip()
eval(expression)