I need help finding the natural log of user generated input

Question

how do I use python to find the natural log of a user's input?

import math

def log_e(power_of_e):
    math.log = power_of_e
    exponent = math.log
    return exponent

my_number = float(input('Enter a number and I will give you it\'s natural logarithm:'))
print (log_e(my_number))

Your function never actually calls `math.log()`. Instead it simply returns the value you passed in, clobbering the `math.log()` function in the process. You should look at some basic tutorials on how to call functions. — kindall, Mar 03 '18 at 00:33
I removed your tag as `[logging]` does not mean using logarithm at all. the `[e]` means also something different if you hover mouse over the tag it will show hint where is described what the tag stands for .... — Spektre, Mar 03 '18 at 08:09

score 0 · Answer 1 · edited Mar 03 '18 at 00:36

0

import math

def log_e(power_of_e):
    exponent=math.log(power_of_e)
    return exponent

my_number=float(input('Enter a number and I will give you it\'s natural logarithm:'))
print (format(log_e(my_number),'.3f'))

edited Mar 03 '18 at 00:36

kindall

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answered Mar 03 '18 at 00:29

Michael Chapman

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score 0 · Answer 2 · answered Mar 03 '18 at 00:37

0

math.log takes an optional second argument which is the base to use. math.e is the constant e. Put them together and you get:

import math

def log_e(number):
    return math.log(number, math.e)

answered Mar 03 '18 at 00:37

kindall

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I need help finding the natural log of user generated input

2 Answers2