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Python math.log10() Method

The Python math.log10() method is used to retrieve the logarithm of the given number with base 10.

According to the mathematical definition, a logarithmic function of a number produces a result which is raised by its base to achieve the said number. However, in usual logarithms, the base can be any value, but for this method we only take the base value as 10.

In other words, this method provides us the logarithm of any value for a base 10. It follows the formula given below −

log10a = result

Following is the syntax of Python math.log10() method −

math.log10(x)

Note − This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.

• x − This is a numeric expression.

This method returns base-10 logarithm of x for x > 0.

The following example shows the usage of the Python math.log10() method. Here we are passing positive numbers as an argument to the log10() method.

# importing the math module
import math   
print ("math.log10(100.12) : ", math.log10(100.12))
print ("math.log10(100.72) : ", math.log10(100.72))
print ("math.log10(math.pi) : ", math.log10(math.pi))

When we run above program, it produces following result −

math.log10(100.12) :  2.00052084094
math.log10(100.72) :  2.0031157171
math.log10(math.pi) :  0.497149872694

In the below code, we are creating a tuple of numbers and a list of numbers. Then, in the log10 method, we are trying to find the log of the value at index 3 in the tuple and at index 2 in the list.

import math
# Creating a tuple
Tuple = (7, 83, -34, 26, -84)
# Crating a list
List = [8, -35, 56.34, 2, -46] 
print('The log10() value of Tuple Item is:', math.log10(Tuple[3]))
print('The log10() value of List Item is:', math.log10(List[2]))

Output of the above code is as follows −

The log10() value of Tuple Item is: 1.414973347970818
The log10() value of List Item is: 1.7508168426497546

If we pass a string as an argument to this method, it returns a TypeError.

In the following example we are retrieving the log10 value of multiple values passed as an argument to the log10() method. Also we are trying to retrieve the log10 value of a string.

import math
num = 34 + 5837 - 334
num2 = 'TutorialsPoint'
res = math.log10(num)
print('The log10() value of multiple numbers is:', res)
print('The log10() value of a string is:', math.log(num2))

We get the output as shown below while executing the above code −

The log10() value of multiple numbers is: 3.7432745235119333
Traceback (most recent call last):
  File "C:\Users\Lenovo\Desktop\untitled.py", line 6, in <module>
    print('The log10() value of a string is:', math.log(num2))
TypeError: must be real number, not str

If we pass a zero as an argument to this method, it raises a ValueError.

import math
num = 0.0
res = math.log10(num)
print('The result for num2 is:', res)

While executing the above code we get the following output −

Traceback (most recent call last):
  File "C:\Users\Lenovo\Desktop\untitled.py", line 3, in <module>
    res = math.log10(num)
ValueError: math domain error

When we pass a negative value as an argument to this method, it raises a ValueError

import math
# negative number
num = -76
res = math.log10(num)
print('The result for num2 is:', res)

Following is an output of the above code −

Traceback (most recent call last):
  File "C:\Users\Lenovo\Desktop\untitled.py", line 4, in <module>
    res = math.log10(num)
ValueError: math domain error

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