def isHexagonalNumber(self, n):
"""Determine whether n is hexagonal number.
Return False if 'n' is not hexagonal number,
else return the position of 'n' in the hexagonal number sequence.
Arguments:
n -- input number
"""
delta = math.sqrt(8 * n + 1)
if integer.isInt(delta):
x = (delta + 1) / 4
if integer.isInt(x) and x > 0:
return int(x)
else:
return False
def isTriangleNumber(self, n):
"""Determine whether is triangle number.
Return False if 'n' is not triangle number,
else return the position of
'n' in the triangle number sequence.
Arguments:
n -- input number
"""
delta = math.sqrt(8 * n + 1)
if integer.isInt(delta):
x = (delta / 2) - 0.5
if integer.isInt(x) and x > 0:
return int(x)
else:
return False
def __init__(self, start=2):
"""Arguments:
start -- the number starts from (default 2)
"""
if integer.isInt(start) and start >= 2:
self.gen = start
self.start = start
else:
raise ValueError('Start number must be an integer and not less than 2.')
def numToDigitArray(num):
"""Return an array of int which represent the number by digit.
Arguments:
num -- input number
"""
if integer.isInt(num):
digitArray = []
strArray = str(num)
for s in strArray:
digitArray.append(int(s))
return digitArray
else:
raise ValueError("Number must be integer.")
def reset(self, start=None):
"""Reset generator.
Arguments:
start -- if not set, reset to the start number which initialized with
(default None)
"""
if start is None:
self.gen = self.start
else:
if integer.isInt(start) and start >= 2:
self.gen = start
self.start = start
else:
raise ValueError('Start number must be an integer and not less than 2.')
def numToShortDigitArray(num, digitArray):
"""Parse number into provided digitArray. If the length of digitArray is
smaller than the length of num, then only last fitable digits will be
filled into the array.
Arguments:
num -- input number
digitArray -- digit array that needed to be filled
"""
if integer.isInt(num):
strArray = str(num)
rStrArray = strArray[::-1]
numLength = len(strArray)
digitLength = len(digitArray)
for i in xrange(0, numLength):
if i < digitLength:
digitArray[digitLength - i - 1] = int(rStrArray[i])
else:
raise ValueError("Number must be integer.")
