Trying to rewrite a C# Script into Python, not working

Question

I'm trying to convert a C# script into Python. Here's what the C# Program looks like.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Encoder
{
    public static string encodeLength(int value, int length)
    {
        string stack = "";
        for (int x = 1; x <= length; x++)
        {
            int offset = 6 * (length - x);
            byte val = (byte)(64 + (value >> offset & 0x3f));
            stack += (char)val;
        }
        return stack;
    }
    public static string encodeLength(string Val)
    {
        int value = Val.Length;
        int length = 2;
        string stack = "";
        for (int x = 1; x <= length; x++)
        {
            int offset = 6 * (length - x);
            byte val = (byte)(64 + (value >> offset & 0x3f));
            stack += (char)val;
        }
        return stack;
    }
    public static string encodeLength(int value)
    {
        int length = 2;
        string stack = "";
        for (int x = 1; x <= length; x++)
        {
            int offset = 6 * (length - x);
            byte val = (byte)(64 + (value >> offset & 0x3f));
            stack += (char)val;
        }
        return stack;
    }
}

This is the stuff that I get returned when I call Encoder.encodeLength(55) + Encoder.encodeLength("Testing.".Length) + "Testing. in C#.

@w@HTesting.

Here's what I've written in Python so far.

def encodeLength(*args):
    if len(args) == 2 and isinstance(args[0] and args[1], int):
        i = 1
        stack = str()
        while (i <= length):
            offset = 6 * (length - i)
            x = 64 + (value >> offset & 0x3f)
            stack += str(x)
            i +=1
        return stack

    elif len(args) == 1 and isinstance(args[0], str):
        i = 1
        value = args[0]
        length = 2
        stack = str()
        while (i <= length):
            offset = 6 * (length - i)
            x = 64 + (value >> offset & 0x3f)
            stack += str(x)
            i += 1
        return stack

    elif len(args) == 1 and isinstance(args[0], int):
        i = 1
        length = 2
        stack = str()
        while (i <= length):
            offset = 6 * (length - i)
            x = 64 + (args[0] >> offset & 0x3f)
            stack += str(x)
            i +=1
        return stack

This is my response in Python when I call encodeLength(55) + encodeLength(len("Testing.")) + "Testing.".

641196472Testing.

Does anyone know why this isn't returning the output generated by C#?

Also, in the C# example your second struing is "Testing" in the python example, your string is "Testing." you have an extra character. — WombatPM
– WombatPM, Commented Aug 11, 2014 at 18:50

hlt · Accepted Answer · 2014-08-11 17:49:29Z

4

In Python, str(x) does not convert a char code (ASCII value) into the corresponding char. Use chr(x) to achieve this. str(x) converts objects into strings, meaning that the ASCII code 64 is turned into the string "64", rather than into "@", which is what chr(x) returns.

answered Aug 11, 2014 at 17:49

hlt

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