Python script not executing properly | Code Society | Page 1

leaden yew Nov 14, 2022, 4:14 AM

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Hello, im new to coding and have little knowledge and wondering if anyone can help me with this code im working on. I tried to run it but nothing is happening. Thanks!!

bold coral Nov 14, 2022, 4:23 AM

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It's because you're not calling the main properly. The call (main()) should be outside the function. In other words, you simply need to un-indent it.

def main():
  ...

main()

leaden yew Nov 14, 2022, 4:35 AM

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bold coral It's because you're not calling the main properly. The call (`main()`) should be...

Like this? Because its still not working

bold coral Nov 14, 2022, 4:36 AM

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Kinda. You also need to un-indent the whole main function. Right now, your main function is inside your decimalToRep. It's going to cause some issue and will make it impossible to call your main function.

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It should look like this

def decimalToRep(num, base):
  ...

def main():
  ...

main()

PS. In the future, please send your code like shown bellow instead.
```python
your code here
```

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You should fix your indentation in general. A lot of your code is badly indented and will not work properly or make your code crash.

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It's important to understand that in Python code is structured through indentation. Thus, all statements that have the same indentation are considered to be in the same block (group of statements). It also means that if you want to add statements in a function, a while, a if-else, etc, they need to be in the same block to work properly. The last important thing to know about those block is that anything created in a block is only accessible to this block or it's children (block or statement inside it).

Ex.

while condition:
  statement 1
  statement 2
statement 3

In the example above, statement 1 and 2 are both in the while block and will thus both be executed when the while is executed. The statement 3 is outside the while block and will only be executed once the while is finished.

while loop_condition:
  statement 1
      
  if condition:
    statement 2

statement 3

In this example, all is the same as the previous example except that statement 2 is in an additional block and will be executed only if the condition of the if is met during looping.

https://docs.python.org/3/reference/executionmodel.html

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This is a more complete and well written explanation https://python-course.eu/python-tutorial/structuring-indentation.php

leaden yew Nov 14, 2022, 4:54 AM

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Like this?

leaden yew Nov 14, 2022, 4:54 AM

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bold coral Kinda. You also need to un-indent the whole main function. Right now, your `main...

Like this? Its still not working

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Its still not working

bold coral Nov 14, 2022, 4:54 AM

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It says that there's an indentation issue?

leaden yew Nov 14, 2022, 4:55 AM

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Nope

bold coral Nov 14, 2022, 4:55 AM

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What does it says?

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And please send your code like shown bellow instead.
```python
your code here
```

leaden yew Nov 14, 2022, 4:55 AM

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It doesnt have an error, its just blank

bold coral Nov 14, 2022, 4:55 AM

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Show me

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And if you send your code like I asked I can fix it for you

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You have a lot of error that will flare up in any cases. You need to adjust your decimalToRep function.

leaden yew Nov 14, 2022, 4:57 AM

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‘’Python’’

bold coral Nov 14, 2022, 4:57 AM

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Have you read my explanation of how code-blocks work in Python?

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And again, if you could send your while code like shown bellow I could try to fix it for you
```python
your code here
```

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;compile

def greet(name):
  print(f"Hello {name}")

def main():
  greet("plntbasedmami")

main()

stable vineBOT Nov 14, 2022, 5:02 AM

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Program Output

Hello plntbasedmami

bold coral Nov 14, 2022, 5:05 AM

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Python script not executing properly

leaden yew Nov 14, 2022, 5:10 AM

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bold coral Have you read my explanation of how code-blocks work in Python?

Wait how would I do my code like how you did it?

bold coral Nov 14, 2022, 5:11 AM

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leaden yew Wait how would I do my code like how you did it?

```python
your code here
```

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You send this in the chat

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Of course, you need to change "your code here" by your actual code

leaden yew Nov 14, 2022, 5:17 AM

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‘’’python def decimalToRep (num, base) :
result
while (num>0):
rem = num % base
if rem in range(10) :
result += str(rem)
else:
result += chr(65+(rem%10))
num
num //
das
result = result[::-1]
if(result
return '91
return result
def
main() :
""'"Tests the function.""
print (decimalToRep(10,10))
print (decimalToRep(10
81 )
print (decimalToRep(10,2)
print (decimalToRep(10,16))
main)’’’

leaden yew Nov 14, 2022, 5:17 AM

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bold coral Of course, you need to change "your code here" by your actual code

I dont think that worked lol

bold coral Nov 14, 2022, 5:18 AM

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Yea you got the wrong characters at the beginning and end and it needs to be on their own lines

#

```python
def decimalToRep (num, base) :
result
while (num>0):
rem = num % base
if rem in range(10) :
result += str(rem)
else:
result += chr(65+(rem%10))
num
num //
das
result = result[::-1]
if(result
return '91
return result
def
main() :
""'"Tests the function.""
print (decimalToRep(10,10))
print (decimalToRep(10
81 )
print (decimalToRep(10,2)
print (decimalToRep(10,16))
main)
```

#

def decimalToRep (num, base) :
result
while (num>0):
rem = num % base
if rem in range(10) :
result += str(rem)
else:
result += chr(65+(rem%10))
num
num //
das
result = result[::-1]
if(result
return '91
return result
def
main() :
""'"Tests the function.""
print (decimalToRep(10,10))
print (decimalToRep(10
81 )
print (decimalToRep(10,2)
print (decimalToRep(10,16))
main)

#

Anyway, let's indent this properly

#

;compile

def decimalToRep(num, base):
    result = ""

    while num > 0:
        rem = num % base
        if rem in range(10):
            result += str(rem)
        else:
            result += chr(65 + (rem % 10))
            num = num // base
            result = result[::-1]

        if result == "":
          return result


def main():
    """Tests the function."""
    print(decimalToRep(10, 10))
    print(decimalToRep(10, 81))
    print(decimalToRep(10, 2))
    print(decimalToRep(10, 16))

main()

stable vineBOT Nov 14, 2022, 5:21 AM

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Compiler Output

Killed - processing time exceeded

bold coral Nov 14, 2022, 5:22 AM

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Now all you got to do is fix your function (btw, it says Killed - processing time exceeded because your loop never ends)

leaden yew Nov 14, 2022, 5:25 AM

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‘ ‘ ‘python
def decimalToRep (num, base) :
result
while (num>0):
rem = num % base
if rem in range(10) :
result += str(rem)
else: result += chr(65+(rem%10))
num=num // base
result = result[::-1]
if (result == “”):
return '0’
return result
def main() :
""'"Tests the function.""”
print (decimalToRep(10,10))
print (decimalToRep(10,8))
print (decimalToRep(10,2))
print (decimalToRep(10,16))
main()

bold coral Nov 14, 2022, 5:26 AM

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’’’ are the wrong characters. It needs to be ```

bold coral Nov 14, 2022, 5:26 AM

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bold coral \`\`\`python def decimalToRep (num, base) : result while (num>0): rem = num % ba...

They also need to be on their own line. Look at this message

leaden yew Nov 14, 2022, 5:43 AM

#

‘ ‘ ‘python
def decimalToRep (num, base) :
result
while (num>0):
rem = num % base
if rem in range(10) :
result += str(rem)
else: result += chr(65+(rem%10))
num=num // base
result = result[::-1]
if (result == “”):
return '0’
return result
def main() :
""'"Tests the function.""”
print (decimalToRep(10,10))
print (decimalToRep(10,8))
print (decimalToRep(10,2))
print (decimalToRep(10,16))
main() ' ' '

leaden yew Nov 14, 2022, 5:44 AM

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bold coral Now all you got to do is fix your function (btw, it says `Killed - processing ti...

How do i get the loop to end?

leaden yew Nov 14, 2022, 6:15 AM

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@bold coralWould i use break?

foggy wind Nov 14, 2022, 7:07 AM

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num = num // base ?

not num = num / base ?

isn't // a comment ?

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;compile python

def decimalToRep(num, base):
    result = ""
    i = 0
    while ( (num > 0) and (i < 1000) ):
        rem = num % base
        if rem in range(10):
            if (rem > 0):
               result += str(rem)
        else:
            result += chr(65 + (rem % 10))
            num = num // base
            result = result[::-1]

        i = i + 1
        #print(rem)
        #print(result)
        if result == "":
          return result

def main():
    """Tests the function."""
    print(decimalToRep(10, 10))
    print(decimalToRep(10, 81))
    print(decimalToRep(10, 2))
    print(decimalToRep(10, 16))

main()

stable vineBOT Nov 14, 2022, 7:09 AM

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Program Output

None

None

bold coral Nov 14, 2022, 7:09 AM

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leaden yew <@310386501483757570>Would i use break?

No that's wouldn't be the solution

bold coral Nov 14, 2022, 7:10 AM

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foggy wind `num = num // base` ? not `num = num / base` ? isn't `// a comment ?`

No, // in Python isn't a comment. It's a floor division.

foggy wind Nov 14, 2022, 7:10 AM

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ah ok

bold coral Nov 14, 2022, 7:11 AM

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;compile

print(15 / 2)
print(15 // 2)

stable vineBOT Nov 14, 2022, 7:11 AM

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Program Output

7.5
7

foggy wind Nov 14, 2022, 7:11 AM

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it's appending a bunch of zeros

bold coral Nov 14, 2022, 7:12 AM

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I think it's the fault of the line above it

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I would test it but I'm not on my computer and it's anoying to code on phone. I might check this out tomorrow.

foggy wind Nov 14, 2022, 7:14 AM

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I don't understand what he's trying to do 😄

#

#

ok but he's not using a lookup table 😄

bold coral Nov 14, 2022, 7:14 AM

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I think it's supposed to convert of base 10 to a number of another base?

bold coral Nov 14, 2022, 7:15 AM

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foggy wind ok but he's not using a lookup table 😄

Definitely not

foggy wind Nov 14, 2022, 7:16 AM

#


// Integer JDK7
    /**
     * All possible chars for representing a number as a String
     */
    final static char[] digits = {
        '0' , '1' , '2' , '3' , '4' , '5' ,
        '6' , '7' , '8' , '9' , 'a' , 'b' ,
        'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
        'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
        'o' , 'p' , 'q' , 'r' , 's' , 't' ,
        'u' , 'v' , 'w' , 'x' , 'y' , 'z'
    };

     static int formatUnsignedInt(int val, int shift, char[] buf, int offset, int len) {
        int charPos = len;
        int radix = 1 << shift;
        int mask = radix - 1;
        do {
            buf[offset + --charPos] = Integer.digits[val & mask];
            val >>>= shift;
        } while (val != 0 && charPos > 0);

        return charPos;
    }

#

that's with a lookup table 🙂

#

this one also

#

    public static String toString(int i, int radix) {
        if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX)
            radix = 10;

        /* Use the faster version */
        if (radix == 10) {
            return toString(i);
        }

        char buf[] = new char[33];
        boolean negative = (i < 0);
        int charPos = 32;

        if (!negative) {
            i = -i;
        }

        while (i <= -radix) {
            buf[charPos--] = digits[-(i % radix)];
            i = i / radix;
        }
        buf[charPos] = digits[-i];

        if (negative) {
            buf[--charPos] = '-';
        }

        return new String(buf, charPos, (33 - charPos));
    }

#

digits[] is a look up table

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JDK8 Source:
https://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/Integer.java

leaden yew Nov 14, 2022, 7:19 AM

#

#

Would that be a lookout table that i did?

foggy wind Nov 14, 2022, 7:19 AM

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alpha needs to be a []

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final static char[] alpha = {
        '0' , '1' , '2' , '3' , '4' , '5' ,
        '6' , '7' , '8' , '9' , 'a' , 'b' ,
        'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
        'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
        'o' , 'p' , 'q' , 'r' , 's' , 't' ,
        'u' , 'v' , 'w' , 'x' , 'y' , 'z'
    };

#

maybe capitalized 🤷‍♂️

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but the jdk8 algo is valid for any number negative or positive

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and any radix from 2 to 36

leaden yew Nov 14, 2022, 7:21 AM

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Now my code is saying list index out of range

foggy wind Nov 14, 2022, 7:22 AM

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are you indexed at 0 or 1

#

#

https://stackoverflow.com/questions/2267362/how-to-convert-an-integer-to-a-string-in-any-base

Stack Overflow

How to convert an integer to a string in any base?

Python allows easy creation of an integer from a string of a given base via

int(str, base).
I want to perform the inverse: creation of a string from an integer,
i.e. I want some function int2b...

#

import string
digs = string.digits + string.ascii_letters


def int2base(x, base):
    if x < 0:
        sign = -1
    elif x == 0:
        return digs[0]
    else:
        sign = 1

    x *= sign
    digits = []

    while x:
        digits.append(digs[x % base])
        x = x // base

    if sign < 0:
        digits.append('-')

    digits.reverse()

    return ''.join(digits)

#

where digs are digits then letters 😄

bold coral Nov 14, 2022, 7:24 AM

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foggy wind are you indexed at 0 or 1

I'm guessing they changed alpha to alpha = ["0123456789ABCDEFGHIJKLMNOPQ..."] instead of alpha = ["0", "1", "2", ...] because you said to make it [ ]

foggy wind Nov 14, 2022, 7:24 AM

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from stack overflow, python 3 with // base

#

;compile python

import string
digs = string.digits + string.ascii_letters.upper() + string.ascii_letters

def decimalToRep(x, base):
    if x < 0:
        sign = -1
    elif x == 0:
        return digs[0]
    else:
        sign = 1

    if base < 2:
       base = 2

    x *= sign
    digits = []

    while x:
        digits.append(digs[x % base])
        x = x // base

    if sign < 0:
        digits.append('-')

    digits.reverse()

    return ''.join(digits)

def main():
    """Tests the function."""
    print(decimalToRep(10, 10))
    print(decimalToRep(10, 81))
    print(decimalToRep(10, 2))
    print(decimalToRep(10, 16))
    print(decimalToRep(255, 2))
    print(decimalToRep(255, 16))
    print(decimalToRep(255, 32))
    print(digs)

main()

stable vineBOT Nov 14, 2022, 7:25 AM

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Program Output

10
A
1010
A
11111111
FF
7V
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

foggy wind Nov 14, 2022, 7:25 AM

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the results seems correct for base <= 16

leaden yew Nov 14, 2022, 7:28 AM

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foggy wind the results seems correct for base <= 16

But doesnt that code need a lookout table?

foggy wind Nov 14, 2022, 7:29 AM

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digs is lookup

leaden yew Nov 14, 2022, 7:29 AM

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bold coral I'm guessing they changed alpha to `alpha = ["0123456789ABCDEFGHIJKLMNOPQ..."]` ...

Is the way i did it fine or should i “1”, “2”,

foggy wind Nov 14, 2022, 7:29 AM

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digs is the lookup table on the last line

bold coral Nov 14, 2022, 7:32 AM

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leaden yew Is the way i did it fine or should i “1”, “2”,

The way it was at first was fine although making it a list might be better in this case.

foggy wind Nov 14, 2022, 7:32 AM

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7v is correct for 255 in base 32 in java

#

#

so yeah, this algo works 🙂

leaden yew Nov 14, 2022, 7:33 AM

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bold coral The way it was at first was fine although making it a list might be better in th...

This is the output for the code

foggy wind Nov 14, 2022, 7:35 AM

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oh so you are DECODING (parseInt) not ENCODING (toString)

#

public static int parseInt(String s, int radix)
throws NumberFormatException
    {
        int result = 0;
        boolean negative = false;
        int i = 0;
        int len = s.length();
        int limit = -2147483647; // -0x7fffffff; // Integer.MAX_VALUE;
        int multmin = 0;
        int digit = 0;

        if (len > 0) {
            char firstChar = s.charAt(0);
            if (firstChar < '0') { // Possible leading "+" or "-"
                if (firstChar == '-') {
                    negative = true;
                    limit = -2147483648; //0x80000000; // Integer.MIN_VALUE;
                } else if (firstChar != '+')
                    throw NumberFormatException.forInputString(s);

                if (len == 1) // Cannot have lone "+" or "-"
                    throw NumberFormatException.forInputString(s);
                i++;
            }
            multmin = limit / radix;
            while (i < len) {
                // Accumulating negatively avoids surprises near MAX_VALUE
                digit = Character.digit(s.charAt(i++),radix);
                if (digit < 0) {
                    throw NumberFormatException.forInputString(s);
                }
                if (result < multmin) {
                    throw NumberFormatException.forInputString(s);
                }
                result *= radix;
                if (result < limit + digit) {
                    throw NumberFormatException.forInputString(s);
                }
                result -= digit;
            }
        } else {
            throw NumberFormatException.forInputString(s);
        }
        return negative ? result : -result;
    }

#

test cases

/**
     * parseInt("0", 10) returns 0
     * parseInt("473", 10) returns 473
     * parseInt("+42", 10) returns 42
     * parseInt("-0", 10) returns 0
     * parseInt("-FF", 16) returns -255
     * parseInt("1100110", 2) returns 102
     * parseInt("2147483647", 10) returns 2147483647
     * parseInt("-2147483648", 10) returns -2147483648
     * parseInt("2147483648", 10) throws a NumberFormatException
     * parseInt("99", 8) throws a NumberFormatException
     * parseInt("Kona", 10) throws a NumberFormatException
     * parseInt("Kona", 27) returns 411787
*/

leaden yew Nov 14, 2022, 7:39 AM

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foggy wind test cases ```java /** * parseInt("0", 10) returns 0 * parseInt("473",...

What does this mean?

foggy wind Nov 14, 2022, 7:40 AM

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it's just a comment

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I am showing you the algorithm in Java, because I cannot find python3 😄 equivalent yet

leaden yew Nov 14, 2022, 7:41 AM

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Thanks

foggy wind Nov 14, 2022, 7:42 AM

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but basically you parse each byte into a lookup table and shift multiply by that base

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until you read the entire thing

leaden yew Nov 14, 2022, 7:42 AM

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foggy wind ;compile python ```python import string digs = string.digits + string.ascii_lett...

So this code answers all of my code assignment question?

foggy wind Nov 14, 2022, 7:43 AM

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"10" in base 10
is 1 x 10^1 + 0 x 10^0

#

"10" in base 16
is 1 x 16^1 + 0 x 16^0

#

anyway

#

🙂

leaden yew Nov 14, 2022, 7:47 AM

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foggy wind "10" in base 16 is 1 x 16^1 + 0 x 16^0

I tried the code but its saying invalid syntax on line 2 where it has digs= string.digits+

foggy wind Nov 14, 2022, 7:49 AM

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works in python3

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maybe not in python2

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but that's for encoding, not decoding

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your initial code was more decoding also 🙂

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i gtg

leaden yew Nov 14, 2022, 7:50 AM

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Well im not sure if im supposed to encode or decode

leaden yew Nov 14, 2022, 7:51 AM

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foggy wind your initial code was more decoding also 🙂

Thanks for your help and do you think this code answers the question

foggy wind Nov 14, 2022, 7:51 AM

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try it

leaden yew Nov 14, 2022, 7:52 AM

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Well it gave 10 8 2 and 16

leaden yew Nov 14, 2022, 7:52 AM

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foggy wind try it

As output

foggy wind Nov 14, 2022, 9:31 PM

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I am assuming that decimal to representation in base X
means you have to encode not to decode

#Python script not executing properly