Python log

The Python math log function calculates the logarithmic value of a given number with base E. The syntax of the math log Function in Python is

math.log(number, base);

The base argument is an optional one. If you omit this, Python log function considers default E as a logarithm base. However, you can change using this parameter.

Number: A valid numerical expression.

• If the number argument is a positive number, the log function returns the output.
• If the number is Negative or Zero, log function returns ValueError.
• And if it is not a number, log function returns TypeError.

Python log Function Example

The Python log Function calculates the logarithmic value of the given number with base E.  Here, we used the log function to find the logarithmic value of different data types.

# Python LOG Function

import math

Tup = (1, 2, 3, -4 , 5) # Tuple Declaration
Lis = [-1, 2, -3.5, -4 , 5] # List Declaration

print('Logarithm value of Positive Number = %.2f' %math.log(1))
print('Logarithm value of Positive Decimal = %.2f' %math.log(2.5))

print('Logarithm value of Tuple Item = %.2f' %math.log(Tup[2]))
print('Logarithm value of List Item = %.2f' %math.log(Lis[4]))

print('Logarithm value of Multiple Number = %.2f' %math.log(2 + 7 - 5))
print('Logarithm value of String Number = ', math.log('Hello'))

1. Within the first two statements, we used the math log Function directly on Positive integer and Decimal values.
2. Next two statements, We used the math log Function on Python Tuple and Python List items. If you observe the above Python screenshot, this Math function is working perfectly on them.
3. We tried math log Function directly on multiple values
4. We tried Python logarithmic Function on the String value, and it returns TypeError: a float is required
5. Next, We tried log Function on Negative value and it is returning ValueError: math domain error
6. Last, We tried log Function on Zero value. As we said before, this is returning ValueError: math domain error