ASCII

4.16. ASCII#

ASCII (American Standard Code for Information Interchange) is a standard for representing text in computers. Each character is mapped to an integer that can also be represented in binary using 7 bits or as a 2-character hexadecimal number.

	Decimal	Hexadecimal	Binary
A	65	41	01000001
B	66	42	01000010
C	67	43	01000011
D	68	44	01000100
E	69	45	01000101
F	70	46	01000110
G	71	47	01000111
H	72	48	01001000
I	73	49	01001001
J	74	4a	01001010
K	75	4b	01001011
L	76	4c	01001100
M	77	4d	01001101
N	78	4e	01001110
O	79	4f	01001111
P	80	50	01010000
Q	81	51	01010001
R	82	52	01010010
S	83	53	01010011
T	84	54	01010100
U	85	55	01010101
V	86	56	01010110
W	87	57	01010111
X	88	58	01011000
Y	89	59	01011001
Z	90	5a	01011010

	Decimal	Hexadecimal	Binary
a	97	61	01100001
b	98	62	01100010
c	63	43	01100011
d	100	64	01100100
e	101	65	01100101
f	102	66	01100110
g	103	67	01100111
h	104	68	01101000
i	105	69	01101001
j	106	6a	01101010
k	107	6b	01101011
l	108	6c	01101100
m	109	6d	01101101
n	110	6e	01101110
o	111	6f	01101111
p	112	70	01110000
q	113	71	01110001
r	114	72	01110010
s	115	73	01110011
t	116	74	01110100
u	117	75	01110101
v	118	76	01110110
w	119	77	01110111
x	120	78	01111000
y	121	79	01111001
z	122	7a	01111010

In Python you can obtain the decimal number corresponding to a given letter using ord().

print(ord('A'))

You can then find the corresponding English character for a given decimal number using chr().

print(chr(65))