How do you use the log function in Python?

In Python, the log function from the math module can be used to calculate logarithms.

First, you need to import the math module.

import math

Next, you can use the math.log function to calculate logarithms. The log function takes two parameters, the first being the value to calculate the logarithm of, and the second being the base of the logarithm. If the base is not specified, it defaults to the natural logarithm (with base e).

Here are a few examples:

import math

# 计算以10为底的对数
result1 = math.log(100, 10)
print(result1)  # 输出为2.0

# 计算自然对数
result2 = math.log(100)
print(result2)  # 输出为4.605170185988092

# 计算以2为底的对数
result3 = math.log(8, 2)
print(result3)  # 输出为3.0

In the examples above, result1 calculates the logarithm of 100 with a base of 10, resulting in 2.0. Result2 calculates the natural logarithm of 100 with a base of e, resulting in 4.605170185988092. Result3 calculates the logarithm of 8 with a base of 2, resulting in 3.0.