String Processing in Python: Integer to String

In this video, we will be solving the following problem:

You are given some integer as input, (i.e. ... -3, -2, -1, 0, 1, 2, 3 ...)
Convert the integer you are given to a string. Do not make use
of the built-in "str" function.
Examples:
Input: 123
Output: "123"
Input: -123
Output: "-123"

This video is part of a series on string processing and, specifically, on how these problems tend to show up in the context of a technical interview:

This video is also part of an "Algorithm" series. For more algorithm tutorials:

The software written in this video is available at:

Do you like the development environment I'm using in this video? It's a customized version of vim that's enhanced for Python development. If you want to see how I set up my vim, I have a series on this here:

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[arungiri]

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[mateuszsmendowski]

So much useful knowledge here. Again, chapeux bas!

[GiorgosPerakis]

Exceptional video! I would never have thought the chr() and ord() functions and how the could be used.

But in respect to the "appending to a list and then reverse" issue wouldn't be simpler to do something like the following?


def int_to_str(input_int: int) -> str:
"""
You are given some integer as input, (i.e ... -3, -2, -1, 0, 1, 2, 3, ...)

Convert the integer you are given to a string. Do not make use of the built-in
"str" function.

Examples:
Input: 123
Output: "123"

Input: -123
Output: "-123"


:param input_int: int
:return: str
"""

is_negative = False
if input_int < 0:
is_negative = True
input_int *= -1

output_str = ''

while input_int > 0:

last_digit = input_int % 10

last_digit_str = chr((ord('0')) + last_digit)

# since the order of the extraction is the opposite of the number that we want to show
# we concatenate the string by putting the extracted digit_str to the beginning

output_str = last_digit_str + output_str

input_int //= 10

if is_negative:
output_str = '-' + output_str

return output_str

[sostomc]

Thank you for this, I'm looking for some direction here; Write a function that receives an integer and returns it in words:- Given 123 should return 'one hundred and twenty three'. How would you approach this?

[johnmwansa]

brother help us the video how to change this number 76896 to replac 2 to remove 8 to be come like this 76296 using python.