(Part 5) The Python Language
The Python Language (Part 5)
Copyright ? 2021 by Robert M. Dondero, Ph.D.
Princeton University
1
Objectives
? We will cover:
? A subset of Python... ? That is appropriate for COS 333... ? Through example programs
2 Objectives Continued from Part 4 [see slide]
Agenda
? Prelim: character and string encodings ? Files ? The "with" statement ? Arrays ? Associative arrays ? Iterable classes ? Variadic functions/methods
3
Character Encodings
Examples:
Encoding
ASCII Latin-1 UCS-2 UCS-4 UTF-8 UTF-16
Fixed/Variable Width Fixed Fixed Fixed Fixed Variable Variable
Bytes
1 (7 bits) 1 2 4 1, 2, 3, or 4 2 or 4
4
Character Encodings
As you know, any modern computer deals with all data as bytes 1 byte = 8 bits
To deal with characters, any computer must use a character encoding A character encoding maps each character to the byte(s) which represent it
There are many character encodings
[see slide]
ASCII is a fixed-width encoding in which each character is mapped to 1 byte ...
Character Encodings
Character ASCII Latin-1 UCS-2 UCS-4 UTF-8 UTF-16
space
20
20
0020 00000020 20
0020
!
21
21
0021 00000021 21
0021
0
30
30
0030 00000030 30
0030
A
41
41
0041 00000041 41
0041
a
61
61
0061 00000061 61
0061
a with grave
Greek small pi
Double prime
Aegean number 2000
e0
00e0 000000e0 e0
00e0
03c0 000003c0 cf80
03c0
2033 00002033 e280b3 2033
00010123 f09084a3 d800dd23
5
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