Python使用非必需字符填充字符串

Question

In this Python code, I have the following problem. When the result is displayed, I get a bunch of zeros in the result (see below) - otherwise, the result is correct (the ending numbers of the string). Can anyone spot the error?

def menu():
    binNumber = ''
    decNumber = float(input("Enter a positive number: "))
    decNumber, binNumber = decimalToBinary(decNumber, binNumber)

    printResult(binNumber)

def decimalToBinary(dec, bin):
    while dec != 0:
        remain = dec % 2
        dec = dec / 2
        if remain > 0.5:
            bin += '1'
        else:
            bin += '0'
    return dec, bin

def printResult(binNumber):
    print("The binary notation is:", binNumber[::-1]) # the last part is to reverse the string

menu()

This is the result if I type "2"

The binary notation is:

Answer 1

Change

decNumber = float(input("Enter a positive number: "))

to

decNumber = int(input("Enter a positive number: "))

And use integer division. Instead of

dec = dec / 2

use

dec = dec // 2

with these changes, I get the following output

The binary notation is: 10

Answer 2

@Ragnar, before everything I should mention that your code is wrong. I tried to convert 12 and 41 with this code and it failed. To get a complete help, I suggest you to see this question .