类型错误：“int”类型的对象没有 len() *减法*

Question

I'm trying to figure out if there's a way to make a small calculation by subtracting a variables number from 4

number_1_raw = random.randrange(1, 1000)
number_1_len = len(number_1_raw)
number_of_zeros = 4 - number_1_len
print("0" * number_of_zeros + number_1_raw)

I wanted the script to give me an answer that ranged from 1-3, however the code isn't executing properly.

The desired output would be something like this: 0617 or 0071 or 0008, etc.

Please help with this issue, thanks!

Answer 1

You cant call len on an integer.

The len() function returns the number of items in an object. When the object is a string, the len() function returns the number of characters in the string.

so what you can do is

number_1_len = len(str(number_1_raw))

str changes int type to string type.

Answer 2

This line number_1_len = len(number_1_raw) is problem. You are getting an integer value as number_1_len, and it has length of one. This number_1_len is actually the number of zeros that you want

Answer 3

I think you need:

import random

number_1_raw = random.randrange(1, 1000)
number_1_len = len(str(number_1_raw))
number_of_zeros = 4 - number_1_len
print(number_of_zeros)
result = "0" * number_of_zeros

print(result+str(number_1_raw))

Output

1            # number of zeros
0801

What's wrong with your code

You are trying to find length of an integer number_1_raw which is giving you the error as you need iterables or string to find a length of that object. First convert it into string and then use len on it.

Furthermore, in print statement you need to convert number_1_raw into string so that it can be appended. You can not perform + operation on str and int .

Answer 4

Fist all I need to understands better what are happening...

Fist

number_1_raw = random.randrange(1, 1000)

The random.randrange returns a number, probably int.

Second

number_1_len = len(number_1_raw)

Has a problem, because number_1_raw is an int and len is a function that count the number of elements from an array, an object... but number_1_len isn't... that's an int and len can't count an int element...

Is important you show all which error you're getting... and explain better what you're trying to do...

Answer 5

I added the str() in a specific line so that your code runs without any error

import random
number_1_raw = str(random.randrange(1, 1000)) #I added the str() in this line
number_1_len = len(number_1_raw)
number_of_zeros = 4 - number_1_len
print("0" * number_of_zeros + number_1_raw)

it is completely your code except that modified line bro. You had coded well bro but a small datatype mistake only you can rectify them as you learn. i hope this is useful :)