Python oneliner similar to eval.vbs:
import sys; from math import *; print eval(sys.argv[1])
Use decimal point to avoid int results from integer values in Python 2.xx e.g. 3/2.0 (I believe Python 3 defaults to float?)
Examples
C:\>eval.py 5/3
1
C:\>eval.py 5/3.0
1.66666666667
C:\>eval.py sqrt(3)
1.73205080757
C:\>eval.py pi
3.14159265359
C:\>eval.py e
2.71828182846