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int to base solution in Clear category for Friendly Number by ogoro
from itertools import zip_longest
def int_to_base(number, base):
digits = []
digit_width = len(str(base - 1))
while number:
number, digit = divmod(number, base)
digits.append(f'{digit:0{digit_width}}')
return digits[::-1] or ['0']
def power_form(digits, decimals, powers, base):
print('Digits:', digits)
print('Powers:', powers)
power_tuples = list(zip_longest(powers, reversed(digits)))[::-1]
print('Power tuples:', power_tuples)
whole_part = ''
fractional_part = ''
is_whole_part = True
selected_power = None
for power, digit in power_tuples:
print(' Power tuple:', (power, digit))
if digit is None:
continue
if is_whole_part:
whole_part += digit
if not is_whole_part:
fractional_part += digit.lstrip('0')
if power is not None and selected_power is None:
selected_power = power
is_whole_part = False
if decimals == 0:
fractional_part = ''
if base <= 10:
whole_part = str(int(whole_part or '0', base))
fractional_part = str(int(fractional_part or '0', base))
print('Selected power:', selected_power)
print('Whole part:', whole_part)
print('Fractional part:', fractional_part)
number = float(whole_part + '.' + fractional_part)
print('Float:', number)
print('Decimals:', decimals)
power_number = f'{number:.{decimals}f}' + selected_power
print('Power number:', power_number)
return power_number
def friendly_number(number, base=1000, decimals=0, suffix='',
powers=('', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')):
print('Initial number:', f'{number:,}')
print('Base:', base)
is_negative = number < 0
if is_negative:
unsigned_number = -number
else:
unsigned_number = number
print('Unsigned number:', unsigned_number)
digits = int_to_base(unsigned_number, base)
print('Digits:', digits)
print('Based:', ''.join(map(str, digits)))
powered_number = power_form(digits, decimals, powers, base)
signed_number = '-' * is_negative + powered_number
final_number = signed_number + suffix
print('Sign and suffix:', final_number)
print()
return final_number
if __name__ == '__main__':
assert friendly_number(102) == '102', '102'
assert friendly_number(10240) == '10k', '10k'
assert friendly_number(12341234, decimals=1) == '12.3M', '12.3M'
assert friendly_number(12461, decimals=1) == '12.5k', '12.5k'
assert friendly_number(1024000000, base=1024, suffix='iB') == '976MiB', '976MiB'
assert friendly_number(-150, base=100, powers=["", "d", "D"]) == '-1d'
assert friendly_number(255000000000, powers=["", "k", "M"]) == '255000M'
assert friendly_number(10 ** 32) == '100000000Y'
assert friendly_number(-155, base=100, decimals=1, powers=["", "d", "D"]) == '-1.6d'
assert friendly_number(0, decimals=3, suffix="th")
assert friendly_number(4294967297, base=2,
powers=["p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7", "p8", "p9", "p10", "p11", "p12",
"p13",
"p14", "p15", "p16", "p17", "p18", "p19", "p20", "p21", "p22", "p23", "p24", "p25",
"p26",
"p27", "p28", "p29", "p30", "p31"]) == '2p31'
assert friendly_number(4000000001, base=1024, decimals=1) == '3.7G'
Jan. 27, 2021
