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* flake8 --max-line-length=88
* fixup! Format Python code with psf/black push
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
""" Convert Base 10 (Decimal) Values to Hexadecimal Representations """
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# set decimal value for each hexadecimal digit
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values = {
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0: "0",
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1: "1",
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2: "2",
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3: "3",
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4: "4",
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5: "5",
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6: "6",
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7: "7",
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8: "8",
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9: "9",
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10: "a",
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11: "b",
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12: "c",
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13: "d",
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14: "e",
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15: "f",
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}
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def decimal_to_hexadecimal(decimal):
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"""
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take integer decimal value, return hexadecimal representation as str beginning
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with 0x
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>>> decimal_to_hexadecimal(5)
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'0x5'
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>>> decimal_to_hexadecimal(15)
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'0xf'
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>>> decimal_to_hexadecimal(37)
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'0x25'
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>>> decimal_to_hexadecimal(255)
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'0xff'
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>>> decimal_to_hexadecimal(4096)
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'0x1000'
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>>> decimal_to_hexadecimal(999098)
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'0xf3eba'
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>>> # negatives work too
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>>> decimal_to_hexadecimal(-256)
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'-0x100'
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>>> # floats are acceptable if equivalent to an int
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>>> decimal_to_hexadecimal(17.0)
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'0x11'
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>>> # other floats will error
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>>> decimal_to_hexadecimal(16.16) # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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AssertionError
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>>> # strings will error as well
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>>> decimal_to_hexadecimal('0xfffff') # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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AssertionError
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>>> # results are the same when compared to Python's default hex function
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>>> decimal_to_hexadecimal(-256) == hex(-256)
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True
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"""
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assert type(decimal) in (int, float) and decimal == int(decimal)
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hexadecimal = ""
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negative = False
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if decimal < 0:
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negative = True
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decimal *= -1
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while decimal > 0:
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decimal, remainder = divmod(decimal, 16)
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hexadecimal = values[remainder] + hexadecimal
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hexadecimal = "0x" + hexadecimal
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if negative:
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hexadecimal = "-" + hexadecimal
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return hexadecimal
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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