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What is uu.decode in Python?

Adnan Abbas

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

File transfers often involve encoding and decoding the file contents because of security (encryption), compression, and OS compatibility.

For this purpose, the uu module helps us to encode and decode files in uuencode format. It is used to convert binary data to plain text.

A uu encoder takes groups of three bytes (24 bits) and converts each group to a sequence of four printable characters.

The decode function decodes the uuencoded input file into a decoded output file.

Parameters

The decode function has arguments as described below:

decode(in_file, out_file=None, mode=None, quiet=False)

The default values for outfile, and mode are taken from the infile header. If the infile is produced by an incorrect uuencoder, then decode might show a warning.

Setting quiet to True removes this warning.

File decoding

Example

To illustrate the decode function, we will first encode a text file using the encode function. It encodes an input file to an encoded output file and then decodes it.

The following code shows how text files are encoded. As line 5 shows, the encoded file is stored in xyz.

Now, we use xyz as the input file to the decode function in line 9 and store the decoded file in decoded-file. We then read the decoded-file and print it. We can see this here:

Note: You should first enter the text in the field given below, and then run the code to see the file in its encoded format.

import uu
import os,sys
infile = "__ed_input.txt"
uu.encode(infile, 'xyz','encoded-file')
f = open('xyz','r')
print("Encoded file is:")
print(f.read())
uu.decode('xyz','decoded-file')
d = open('decoded-file','r')
print("Decoded file is:")
print(d.read())

Enter the input below to be saved in file __ed_input.txt

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Adnan Abbas
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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