When iterating over a string, I am getting a character in my result that was never given

Question

Recently I have been working on making a Python program that iterates over a string. I'm making an ESOLANG with this, but I've run into a big issue. This question is quite long, and I apologize for this. Here is the basic syntax, which you'll need to know to answer this.

• Current Value is a single character stored as ascii numbers.
• e sets the current value to the next character, so eA sets current value to A and eB sets it to B.
• p prints the current value, so eFpeopp prints Foo.
• v sets a variable. Running eAvB will set the variable B to A.
• g gets the value for a variable. The interpolator comes with a default variable (?) which returns the version. So evpg?p will print v2. Use gc to get the variable with the same name as the current value.
• ( starts a loop and ) ends a loop. You can specify the amount of times the loop will run with (n) with n as the number from 0-9. You can use a bigger number with c which will use the current value (ascii number)
• + and - increase and decrease the current value.
• f generates a factorial. The variable 0 will be set to the length of the output, so 5 will make 0 to 3 because the factorial of 5 is 120 which is 3 digits. Then variables 1-3 will have the results because there are three letters. So this program sets current value to 5 and prints the factorial of it. +++++fg1pg2pg3p. In this example, the length (3) is hard coded, so another number wont work. Another flaw is that input is only 1 number. This can be fixed with loops. There are some other characters, but they are not related to this. If you are interested, you can use this Discord bot. Now, my problem. I am trying to get the factorial working, but I can't get it to work. This is my code (yes it is very long):

from math import factorial
def parse(code, currentValue=0, varis={"?":"2"}, getCurrent=False):
    # Copyright (c) UCYT5040
    # minlang - A minimal language
    output = ""
    outputNext = False
    getNext = False
    setNext = False
    valNext = False
    appendNext = False
    getLoopAmount = False
    inLoop = False
    loopCode = ""
    runMoreTimes = 0
    openLoops = 0
    for i in code:
        if valNext:
            currentValue = ord(i)
            valNext = False
            continue
        if appendNext:
            currentValue += ord(i)
            appendNext = False
            continue
        if getNext:
            if i == "c":
                currentValue = ord(varis[chr(currentValue)])
            else:
                currentValue = ord(varis[i])
            getNext = False
            continue
        if outputNext:
            output += chr(i)
            outputNext = False
            continue
        if setNext:
            varis[i] = chr(currentValue)
            setNext = False
            continue
        dontDoThis = False
        if inLoop:
            if i == "(": openLoops+=1
            if i == ")" and openLoops != 0:
                openLoops -= 1
            if openLoops == 0:
                inLoop = False
                dontDoThis = True
            if not dontDoThis:
                loopCode += i
                continue
        if getLoopAmount:
            if i == "c": runMoreTimes = currentValue
            else: runMoreTimes = int(i)
            getLoopAmount = False
            inLoop = True
        while runMoreTimes > 0:
            if not inLoop:
                runMoreTimes -= 1
                output += parse(loopCode, currentValue, varis)
                currentValue = parse(loopCode, currentValue, varis, getCurrent=True)
            else: break
        if runMoreTimes == 0 and not inLoop:
            loopCode = ""

        if i == "e": # Sets the current value to the next character
            valNext = True
        if i == "a": # Adds the next character to the current value
            appendNext = True
        if i == "p": # Print current value
            output += chr(currentValue)
        if i == "g": # Get the value of a variable
            getNext = True
        if i == "v": # Set a variable
            setNext = True
        if i == "(":
            getLoopAmount = True
            openLoops += 1
        if i == "-":
            currentValue -= 1
        if i == "+":
            currentValue += 1
        if i == "i":
            currentValue = ord(input("Enter only 1 character of input: "))
        if i == "?":
            if varis["%"] == varis["!"]:
                output += chr(currentValue)
        if i == "&":
            if not varis["%"] == varis["!"]:
                break
        if i == "f":
            fact = str(factorial(currentValue))
            varis["0"] = str(len(fact))
            for ii in range(len(fact)):
                f = fact[ii]
                print(type(f),f,"fact")
                varis[str(ii+1)] = f
            print(varis["0"])
    if getCurrent:
        return currentValue
    return output
print(parse(input("Enter code to run: ")))

Here are a few of my attempts to get it working.

UCYT5040: min run +++++fg1pg2pg3p 
BOT > Minlang Runner: 120

This was successful, but the following are not.

UCYT5040: min run va++++f g0(cga+vagcp)
Command raised an exception: KeyError: '\x01'
Expanation: Set var a to 0. Get the factorial of 4. Get the value of 0, and run a loop of its length. Edit var a to get each digit. Get the value of the 1st digit (var 1). --ERROR: Trying to get var \x01 rather than 1.--

Why is \x01 passed?

Answer 1

I think you need to replace chr() and ord() with the simple str() and int() in the getNext function's if branch, i.e.,

currentValue = ord(varis[chr(currentValue)])

Why: using currentValue = 1 and assuming factorial has been calculated

chr(1) = '\x01' so when you try to access varis['\x01'] the key doesn't exist in the dictionary [since inside the factorial you store it using str(ii+1)... not chr()

Instead, str(1) = '1', so you will access varis['1'], which will result in '2' and int('2') = 2.