Constants in Prolog

Go supports constants of character, string, boolean, and numeric values.

# Constants: Declare a constant value in Python

S = "constant"
print(S)

A const statement can appear anywhere a var statement can.

N = 500000000

Constant expressions perform arithmetic with arbitrary precision.

D = 3e20 / N
print(D)

A numeric constant has no type until it’s given one, such as by an explicit conversion.

print(int(D))

A number can be given a type by using it in a context that requires one, such as a variable assignment or function call. For example, here math.sin expects a float.

import math
print(math.sin(N))

To run the program, put the code in a file, say constants.py, and use python to execute it.

$ python constants.py
constant
6e+11
600000000000
-0.28470407323754404

Next example: For.

In this Python translation, we use constants and arithmetic expressions similarly to how they are handled in the original code, ensuring the Pythonic way of dealing with them.