How do i check the length of a number in python 3?

Question

What I want to do is determine the length of a number in python, for example I had a user input:

num = input("Enter a number: ")
print(num)

and the output was 1943, how will I get python to return the length of that, which is 4 in this example?

As well as that, how do I save it to a string? I tried this:

t = len(byte)

It just returns this:

Traceback (most recent call last):
File "bytes.py", line 10, in <module>
start()
File "bytes.py", line 5, in start
t = len(bytes)
TypeError: object of type 'type' has no len()

If the question has been answered then accept that answer by clicking the tick mark next to it. — Chris Seymour, Apr 12 '14 at 10:49

score 3 · Answer 1 · edited Jun 20 '20 at 09:12

3

You can simply check its length as string:

print(len(str(num)))

Examples:

>>> num = 123123
>>> print(len(str(num)))
6

>>> num = 10293847586
>>> print(len(str(num)))
11

edited Jun 20 '20 at 09:12

Community

1
1

answered Apr 12 '14 at 10:26

sshashank124

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@sshashank lol the funny thing is, it was a string in the first place. – anon582847382 Apr 12 '14 at 10:31
1

this isn't a cast but you create a new string object. – vikingosegundo Apr 12 '14 at 10:39
@vikingosegundo, Thank you! I have changed the wording of the first line. – sshashank124 Apr 12 '14 at 10:40

score 1 · Answer 2 · answered Apr 12 '14 at 10:44

1

print(len(num))

You already have a string. Just call len on it to get the length.

Your code failed because you typed len(bytes). Particularly, take note of that final s. bytes is the type Python uses to represent sequences of bytes; it's not the variable you used to store your input.

answered Apr 12 '14 at 10:44

user2357112

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Looked and found how: digits = int(math.log10(num))+1 – Okx Apr 12 '14 at 10:46

How do i check the length of a number in python 3?

2 Answers2

Examples: