Page 39 - Programming With Python 3

An Introduction to STEM Programming with Python — 2019-09-03a Page 26
Chapter 2 — Numbering Systems

Power of 16
Decimal
Free Decimal Power of 16 1,048,576
4
0
16
16
1
65,536
1
5
16
16
16
256
16,777,216
16
16 2 3 4,096 16 6 7 268,435,456
16
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Table 3: Powers of 16
Hexadecimal in Python
Edition
In Python, you may directly include base 16 integers exactly the same as you would a decimal number.
You just need to add a "0x" to the front of the number so that Python knows it is not a string or a
decimal number. You will use the symbols 0-9 for 0-9 and a-f for 10-15. The "0x" prefix is not case-
sensitive and the letters a-f may also be in upper and lower case. In the example below, you see the
difference adding the "0x" prefix does. Print will always out a number as a decimal.
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1| print(0X42, 0Xff, 0xfffa, 0XABBACAB)

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66 255 65530 180071595

Python will convert a decimal number into a hexadecimal string, using the hex() function. You will
Free
be able to print it out, but the result is no longer a number and can not be directly used in mathematics.

hex(expression) Function
The hex function will return a string of hexadecimal digits prefixed with '0x'
representing the number passed.
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https://docs.python.org/3.7/library/functions.html#hex
http://bit.ly/2EMo6dJ

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1| print(hex(42))

0x2a

Copyright 2019 — James M. Reneau Ph.D. — http://www.syw2l.org — This work is licensed
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