added automated doctest to decimal_to_hexadecimal.py in conversions (#1071)

* added automated doctest to decimal_to_hexadecimal.py in conversions

* improved error handling and added more test cases in decimal_to_hexadecimal.py

* implemented 0x notation and simplified AssertionError

* fixed negative notation and added comparison test against Python hex function
This commit is contained in:
Jasper 2019-07-26 12:28:32 -04:00 committed by Christian Clauss
parent 46bc6738d7
commit 3b63857b65

View File

@ -21,23 +21,54 @@ values = {
}
def decimal_to_hexadecimal(decimal):
""" take decimal value, return hexadecimal representation as str """
"""
take integer decimal value, return hexadecimal representation as str beginning with 0x
>>> decimal_to_hexadecimal(5)
'0x5'
>>> decimal_to_hexadecimal(15)
'0xf'
>>> decimal_to_hexadecimal(37)
'0x25'
>>> decimal_to_hexadecimal(255)
'0xff'
>>> decimal_to_hexadecimal(4096)
'0x1000'
>>> decimal_to_hexadecimal(999098)
'0xf3eba'
>>> # negatives work too
>>> decimal_to_hexadecimal(-256)
'-0x100'
>>> # floats are acceptable if equivalent to an int
>>> decimal_to_hexadecimal(17.0)
'0x11'
>>> # other floats will error
>>> decimal_to_hexadecimal(16.16) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
AssertionError
>>> # strings will error as well
>>> decimal_to_hexadecimal('0xfffff') # doctest: +ELLIPSIS
Traceback (most recent call last):
...
AssertionError
>>> # results are the same when compared to Python's default hex function
>>> decimal_to_hexadecimal(-256) == hex(-256)
True
"""
assert type(decimal) in (int, float) and decimal == int(decimal)
hexadecimal = ''
negative = False
if decimal < 0:
negative = True
decimal *= -1
while decimal > 0:
remainder = decimal % 16
decimal -= remainder
decimal, remainder = divmod(decimal, 16)
hexadecimal = values[remainder] + hexadecimal
decimal /= 16
hexadecimal = '0x' + hexadecimal
if negative:
hexadecimal = '-' + hexadecimal
return hexadecimal
def main():
""" print test cases """
print("5 in hexadecimal is", decimal_to_hexadecimal(5))
print("15 in hexadecimal is", decimal_to_hexadecimal(15))
print("37 in hexadecimal is", decimal_to_hexadecimal(37))
print("255 in hexadecimal is", decimal_to_hexadecimal(255))
print("4096 in hexadecimal is", decimal_to_hexadecimal(4096))
print("999098 in hexadecimal is", decimal_to_hexadecimal(999098))
if __name__ == '__main__':
main()
import doctest
doctest.testmod()