#!/usr/bin/python3
#The log10() method returns base-10 logarithm of x for x > 0.
# import math
# math.log10( x )

import math # This will import math module

a = 2.1
b = math.log10(a)
print(b)
print ("math.log10(100.12) : ", math.log10(100.12))
print ("math.log10(100.72) : ", math.log10(100.72))
print ("math.log10(119) : ", math.log10(119))
print ("math.log10(math.pi) : ", math.log10(math.pi))