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Python - Homework - Convert any database to any database

I am trying to make a program to convert a number into any base on another base of user choice. The code that I still have is as follows:

innitvar = float(raw_input("Please enter a number: "))
basevar = int(raw_input("Please enter the base that your number is in: "))
convertvar = int(raw_input("Please enter the base that you would like to convert to: "))

This is the data that I receive from the user. The initial number, its initial base and the base to which the user wants to convert. As far as I understand, I need to convert to base 10, and then to the desired base specified by the user.

Here I press a brick wall: I need to multiply the leftmost digit in the initial number by its original base, and then add the next digit to the right, and then repeat until I type the rightmost digit. I understand how to do this on paper, but I have no idea how to put it in Python code. I’m not sure how to multiply the first number, and then add the following, and I don’t understand how to tell the program to stop this operation.

I do not ask for the program to be written for me, but I would like it to be pointed in the right direction.

Thank you for your time!

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6 answers

This should be the first half of the answer to your problem. Can you figure out how to convert to base?

# Create a symbol-to-value table.
SY2VA = {'0': 0,
         '1': 1,
         '2': 2,
         '3': 3,
         '4': 4,
         '5': 5,
         '6': 6,
         '7': 7,
         '8': 8,
         '9': 9,
         'A': 10,
         'B': 11,
         'C': 12,
         'D': 13,
         'E': 14,
         'F': 15,
         'G': 16,
         'H': 17,
         'I': 18,
         'J': 19,
         'K': 20,
         'L': 21,
         'M': 22,
         'N': 23,
         'O': 24,
         'P': 25,
         'Q': 26,
         'R': 27,
         'S': 28,
         'T': 29,
         'U': 30,
         'V': 31,
         'W': 32,
         'X': 33,
         'Y': 34,
         'Z': 35,
         'a': 36,
         'b': 37,
         'c': 38,
         'd': 39,
         'e': 40,
         'f': 41,
         'g': 42,
         'h': 43,
         'i': 44,
         'j': 45,
         'k': 46,
         'l': 47,
         'm': 48,
         'n': 49,
         'o': 50,
         'p': 51,
         'q': 52,
         'r': 53,
         's': 54,
         't': 55,
         'u': 56,
         'v': 57,
         'w': 58,
         'x': 59,
         'y': 60,
         'z': 61,
         '!': 62,
         '"': 63,
         '#': 64,
         '$': 65,
         '%': 66,
         '&': 67,
         "'": 68,
         '(': 69,
         ')': 70,
         '*': 71,
         '+': 72,
         ',': 73,
         '-': 74,
         '.': 75,
         '/': 76,
         ':': 77,
         ';': 78,
         '<': 79,
         '=': 80,
         '>': 81,
         '?': 82,
         '@': 83,
         '[': 84,
         '\\': 85,
         ']': 86,
         '^': 87,
         '_': 88,
         '`': 89,
         '{': 90,
         '|': 91,
         '}': 92,
         '~': 93}

# Take a string and base to convert to.
# Allocate space to store your number.
# For each character in your string:
#     Ensure character is in your table.
#     Find the value of your character.
#     Ensure value is within your base.
#     Self-multiply your number with the base.
#     Self-add your number with the digit value.
# Return the number.

def str2int(string, base):
    integer = 0
    for character in string:
        assert character in SY2VA, 'Found unknown character!'
        value = SY2VA[character]
        assert value < base, 'Found digit outside base!'
        integer *= base
        integer += value
    return integer

. , .

# Create a value-to-symbol table.
VA2SY = dict(map(reversed, SY2VA.items()))

# Take a integer and base to convert to.
# Create an array to store the digits in.
# While the integer is not zero:
#     Divide the integer by the base to:
#         (1) Find the "last" digit in your number (value).
#         (2) Store remaining number not "chopped" (integer).
#     Save the digit in your storage array.
# Return your joined digits after putting them in the right order.

def int2str(integer, base):
    array = []
    while integer:
        integer, value = divmod(integer, base)
        array.append(VA2SY[value])
    return ''.join(reversed(array))

, . , , !

innitvar = raw_input("Please enter a number: ")
basevar = int(raw_input("Please enter the base that your number is in: "))
convertvar = int(raw_input("Please enter the base that you would like to convert to: "))

# Create a symbol-to-value table.
SY2VA = {'0': 0,
         '1': 1,
         '2': 2,
         '3': 3,
         '4': 4,
         '5': 5,
         '6': 6,
         '7': 7,
         '8': 8,
         '9': 9,
         'A': 10,
         'B': 11,
         'C': 12,
         'D': 13,
         'E': 14,
         'F': 15,
         'G': 16,
         'H': 17,
         'I': 18,
         'J': 19,
         'K': 20,
         'L': 21,
         'M': 22,
         'N': 23,
         'O': 24,
         'P': 25,
         'Q': 26,
         'R': 27,
         'S': 28,
         'T': 29,
         'U': 30,
         'V': 31,
         'W': 32,
         'X': 33,
         'Y': 34,
         'Z': 35,
         'a': 36,
         'b': 37,
         'c': 38,
         'd': 39,
         'e': 40,
         'f': 41,
         'g': 42,
         'h': 43,
         'i': 44,
         'j': 45,
         'k': 46,
         'l': 47,
         'm': 48,
         'n': 49,
         'o': 50,
         'p': 51,
         'q': 52,
         'r': 53,
         's': 54,
         't': 55,
         'u': 56,
         'v': 57,
         'w': 58,
         'x': 59,
         'y': 60,
         'z': 61,
         '!': 62,
         '"': 63,
         '#': 64,
         '$': 65,
         '%': 66,
         '&': 67,
         "'": 68,
         '(': 69,
         ')': 70,
         '*': 71,
         '+': 72,
         ',': 73,
         '-': 74,
         '.': 75,
         '/': 76,
         ':': 77,
         ';': 78,
         '<': 79,
         '=': 80,
         '>': 81,
         '?': 82,
         '@': 83,
         '[': 84,
         '\\': 85,
         ']': 86,
         '^': 87,
         '_': 88,
         '`': 89,
         '{': 90,
         '|': 91,
         '}': 92,
         '~': 93}

# Take a string and base to convert to.
# Allocate space to store your number.
# For each character in your string:
#     Ensure character is in your table.
#     Find the value of your character.
#     Ensure value is within your base.
#     Self-multiply your number with the base.
#     Self-add your number with the digit value.
# Return the number.

integer = 0
for character in innitvar:
    assert character in SY2VA, 'Found unknown character!'
    value = SY2VA[character]
    assert value < basevar, 'Found digit outside base!'
    integer *= basevar
    integer += value

# Create a value-to-symbol table.
VA2SY = dict(map(reversed, SY2VA.items()))

# Take a integer and base to convert to.
# Create an array to store the digits in.
# While the integer is not zero:
#     Divide the integer by the base to:
#         (1) Find the "last" digit in your number (value).
#         (2) Store remaining number not "chopped" (integer).
#     Save the digit in your storage array.
# Return your joined digits after putting them in the right order.

array = []
while integer:
    integer, value = divmod(integer, convertvar)
    array.append(VA2SY[value])
answer = ''.join(reversed(array))

# Display the results of the calculations.
print answer
+7

, , , .

, . .

1: divmod(), . 10, .

2: n > 0: divmod(), . quotient n, , , , .

3. . reverse, , . , insert(0,digit).

. . .

for .

, "multiple and add". total = total * new_base + next_digit - , .

+5

, , . , , .

: . . . , 12, 1AB3. , "1" 12 ^ 3 , "A" 12 ^ 2 , "B" 12 ^ 1 "3" 12 ^ 0 () . 10, .

, 1 * 12 ^ 3 + 10 * 12 ^ 2 + 11 * 12 ^ 1 + 3 * 12 ^ 0. - : 3,2,1,0. LENGTH 1AB3. , , for. , . , .

, "A" "C" ? Noctis Skytower!

, - , . - , Noctis Skytower, - , , .

+2

. Scheme ( , Scheme , Python: -P), string->number number->string, , , .

. 10, .

, - .

:

assert str2num('1234', 10) == 1234
assert str2num('1234', 16) == 0x1234
assert num2str(1234, 10) == '1234'
assert num2str(1234, 16) == '4d2'
assert num2str(0x1234, 16) == '1234'
0

int() 2 36. , , , index(), .

0

, , , . , , . Quora, .

() - b1 b2 - b1 → → b2.

b1 b1,

4- abcd = d * (b1 ^ 0) +c * (b1 ^ 1) +b * (b1 ^ 2) +a * (b1 ^ 3)

, 123 ( ) = 3 * (10 ^ 0) +2 * (10 ^ 1) +1 * (10 ^ 2)

, , [digit*(base^power)] ( 0 [NumOfDigits-1]) . string , for.

, string int.

- D b2.

D/b2, - . b2, - . , 0.

.,

8 () :

8/2 = 4; 8% 2 = 0

4/2 = 2; 4% 2 = 0

2/2 = 1; 2% 2 = 0

1/2 = 0; 1% 2 = 1

8 () = 1000 (Bin)

. (. : '0' + '0' + '0' + '1' ='0001', 1000 '1000'

Python:

    N=input("Num:")
    B1=int(input("FromBase:"))
    B2=int(input("ToBase:"))
    print("Base[",B1,"]:",N)

    #From Base B1 to Decimal
    DN=0
    for i in range(len(N)):
        DN+= int(N[::-1][i]) * (B1 ** i)
    print("Decimal:",DN)

    #From Decimal to Base B2
    if int(N) == 0:
        BN = 0
    else:
        BN = ""
        while DN > 0:
            BN += str(DN % B2)
            DN = int(DN / B2)
    print("Base[",B2,"]:",int(BN[::-1]))

, 10. 0-9. if-else, .

N=input("Num:")
B1=int(input("FromBase:"))
B2=int(input("ToBase:"))
print("Base[",B1,"]:",N)

#From Base B1 to Decimal
DN=0
for i in range(len(N)):
    if N[::-1][i] == '0':
        DN += 0 * (B1 ** i)
    elif N[::-1][i] == '1':
        DN += 1 * (B1 ** i)
    elif N[::-1][i] == '2':
        DN += 2 * (B1 ** i)
    '''    :
           :       '''
    elif N[::-1][i] == 'A':
        DN += 10 * (B1 ** i)
    '''    :
           :  (fill it) ....
           :       '''
print("Decimal:",DN)

#From Decimal to Base B2
if int(N) == 0:
    BN = 0
else:
    BN = ""
    while DN > 0:
        R = DN % B2
        if R==0:
            BN += '0'
        elif R==1:
            BN += '1'
        elif R==2:
            BN += '2'
        '''     :
                :
                :       '''
        elif R==10:
            BN += 'A'
        '''     :
                :
                :       '''
        DN = int(DN / B2)
print("Base[",B2,"]:",int(BN[::-1]))

if-else, / . :

Dig={0: '0', 1: '1', 2: '2', 3: '3', 4: '4', 5: '5', 6: '6', 7: '7', 8: '8', 9: '9', 10: 'A', 11: 'B', 12: 'C', 13: 'D', 14: 'E', 15: 'F', 16: 'G', 17: 'H', 18: 'I', 19: 'J'}

N=input("Num:")
B1=int(input("FromBase:"))
B2=int(input("ToBase:"))
print("Base[",B1,"]:",N)

#From Base B1 to Decimal
DN=0
for i in range(len(N)):
    for fv in Dig:
        if Dig[fv]== N[::-1][i]:    # FaceValue of the Digit
            DN+= fv * (B1 ** i)
print("Decimal:",DN)

#From Decimal to Base B2
if N == '0':
    BN = 0
else:
    BN = ""
    while DN > 0:
        BN += Dig[DN % B2]          # Digit for the Value
        DN = int(DN / B2)
print("Base[",B2,"]:",BN[::-1])

🠅There🠅 . .

, , , @Noctis Skytower.

, , , . range(), if-else for, ( , , ). , , , range(a,b), , , range(x,y), Unicode .

Val = {range(10):range(48, 58), range(10,36): range(65, 91)}

N=input("Num:")
B1=int(input("FromBase:"))
B2=int(input("ToBase:"))
print("Base[",B1,"]:",N)

#From Base B1 to Decimal
DN = 0
for i in range(len(N)):
    for j in Val:
        if ord(N[i]) in Val[j]:
            FV=j[ord(N[i])-Val[j][0]]       # FaceValue of the Digit
    if FV>= B1:                             # Digits aren't >=Base, right?
        print("Base Error..")
        exit()
    else:
        DN += FV * (B1 ** (len(N) - 1 - i))
print("Decimal:",DN)

#From Decimal to Base B2
if int(DN) == 0:
    BN = '0'
else:
    BN = ""
    while DN > 0:
        R = DN % B2
        for i in Val:
            if R in i:
                BN+=chr(Val[i][R-i[0]])     #Finding the Digit for the Value
        DN = int(DN / B2)
print("Base[", B2, "]:", BN[::-1])

:

Val = {range(10):range(48, 58), range(10,36): range(65, 91)}

def B2D(N,B1):
    '''From Base B1 to Decimal'''
    DN = 0
    for i in range(len(N)):
        for j in Val:
            if ord(N[i]) in Val[j]:
                FV=j[ord(N[i])-Val[j][0]]       # FaceValue of the Digit
        if FV>= B1:                             # Digits aren't >=Base, right?
            print("Base Error..")
            exit()
        else:
            DN += FV * (B1 ** (len(N) - 1 - i))
    return DN

def D2B(DN,B2):
    '''From Decimal to Base B2'''
    if int(DN) == 0:
        BN = '0'
    else:
        BN = ""
        while DN > 0:
            R = DN % B2
            for i in Val:
                if R in i:
                    BN+=chr(Val[i][R-i[0]])     #Finding the Digit for the Value
            DN = int(DN / B2)
    return BN[::-1]

def B2B(N,B1,B2):
    return D2B(B2D(N,B1),B2)

N=input("Num:")
B1=int(input("FromBase:"))
B2=int(input("ToBase:"))
print("Base[",B1,"]:",N)
print("Decimal:",B2D(N,B1))
print("Base[",B2,"]:",B2B(N,B1,B2))

Now, if you can expand the dictionary, you can probably convert from any database to any database. 😎

Here are some shortcuts I found on other Qaru QA and other websites:

To convert numbers from any base between 2 & 36 to decimal: int(‘NumberString,Base)

>>> int('1000',2)
8
>>> int('100',12)
144
>>> int('AA',17)
180
>>> int('Z',36)
35
>>> int('Z',37)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: int() base must be >= 2 and <= 36, or 0

To convert decimal to binary, octal, and hexadecimal:

>>> bin(8)
'0b1000'
>>> oct(8)
'0o10'
>>> hex(8)
'0x8'

Hope this TL;DRhelped someone. If someone can point out any errors, edit this or provide shorter methods, I will be grateful.

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Source: https://habr.com/ru/post/1770428/

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