34 lines
1 KiB
Python
34 lines
1 KiB
Python
|
class Zillion(object):
|
||
|
|
def __init__(self, digits):
|
||
|
|
if any([c not in "012456789, " for c in digits]): raise RuntimeError("Contains invalid characters.")
|
||
|
|
self.digits = [int(c) for c in digits if c.isdigit()]
|
||
|
|
if not self.digits: raise RuntimeError("Contains no digits.")
|
||
|
|
def increment(self):
|
||
|
|
pos = len(self.digits)
|
||
|
|
while True:
|
||
|
|
pos -= 1
|
||
|
|
self.digits[pos] += 1
|
||
|
|
if self.digits[pos] == 10:
|
||
|
|
if pos == 0:
|
||
|
|
self.digits = [1, 0] + self.digits[1:]
|
||
|
|
break
|
||
|
|
self.digits[pos] = 0
|
||
|
|
else: break
|
||
|
|
def isZero(self):
|
||
|
|
return all([d == 0 for d in self.digits])
|
||
|
|
def __str__(self):
|
||
|
|
"""
|
||
|
|
In Python, it's customary to use the __str__ operator overloader to overload the str()
|
||
|
|
function, rather than using a toString() function, which is common in languages that
|
||
|
|
don't support operator overloading, such as Java.
|
||
|
|
|
||
|
|
See https://docs.python.org/2/reference/datamodel.html#object.__str__ for more details.
|
||
|
|
"""
|
||
|
|
return "".join(map(str, self.digits))
|
||
|
|
def toString(self):
|
||
|
|
return str(self)
|
||
|
|
|
||
|
|
z = Zillion('9')
|
||
|
|
print z.isZero()
|
||
|
|
z.increment()
|
||
|
|
print z, z.digits
|