decimal_to_any.py

"""Convert a positive Decimal Number to Any Other Representation"""

fromstringimportascii_uppercase

ALPHABET_VALUES= {str(ord(c) -55): cforcinascii_uppercase}


defdecimal_to_any(num: int, base: int) ->str:
"""
 Convert a positive integer to another base as str.
 >>> decimal_to_any(0, 2)
 '0'
 >>> decimal_to_any(5, 4)
 '11'
 >>> decimal_to_any(20, 3)
 '202'
 >>> decimal_to_any(58, 16)
 '3A'
 >>> decimal_to_any(243, 17)
 'E5'
 >>> decimal_to_any(34923, 36)
 'QY3'
 >>> decimal_to_any(10, 11)
 'A'
 >>> decimal_to_any(16, 16)
 '10'
 >>> decimal_to_any(36, 36)
 '10'
 >>> # negatives will error
 >>> decimal_to_any(-45, 8) # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 ValueError: parameter must be positive int
 >>> # floats will error
 >>> decimal_to_any(34.4, 6) # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 TypeError: int() can't convert non-string with explicit base
 >>> # a float base will error
 >>> decimal_to_any(5, 2.5) # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 TypeError: 'float' object cannot be interpreted as an integer
 >>> # a str base will error
 >>> decimal_to_any(10, '16') # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 TypeError: 'str' object cannot be interpreted as an integer
 >>> # a base less than 2 will error
 >>> decimal_to_any(7, 0) # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 ValueError: base must be >= 2
 >>> # a base greater than 36 will error
 >>> decimal_to_any(34, 37) # doctest: +ELLIPSIS
 Traceback (most recent call last):
 ...
 ValueError: base must be <= 36
 """
ifisinstance(num, float):
raiseTypeError("int() can't convert non-string with explicit base")
ifnum<0:
raiseValueError("parameter must be positive int")
ifisinstance(base, str):
raiseTypeError("'str' object cannot be interpreted as an integer")
ifisinstance(base, float):
raiseTypeError("'float' object cannot be interpreted as an integer")
ifbasein (0, 1):
raiseValueError("base must be >= 2")
ifbase>36:
raiseValueError("base must be <= 36")
new_value=""
mod=0
div=0
whilediv!=1:
div, mod=divmod(num, base)
ifbase>=11and9<mod<36:
actual_value=ALPHABET_VALUES[str(mod)]
else:
actual_value=str(mod)
new_value+=actual_value
div=num//base
num=div
ifdiv==0:
returnstr(new_value[::-1])
elifdiv==1:
new_value+=str(div)
returnstr(new_value[::-1])

returnnew_value[::-1]


if__name__=="__main__":
importdoctest

doctest.testmod()

forbaseinrange(2, 37):
fornuminrange(1000):
assertint(decimal_to_any(num, base), base) ==num, (
num,
base,
decimal_to_any(num, base),
int(decimal_to_any(num, base), base),
 )