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Full Discussion: 2 lines of python
Top Forums Shell Programming and Scripting 2 lines of python Post 303002424 by durden_tyler on Thursday 24th of August 2017 02:14:16 AM
Old 08-24-2017
Quote:
Originally Posted by 1Brajesh
...
Please can you tell me what the last two lines in the python code below are doing?
Code:
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)
print 'data has %d characters, %d unique.' % (data_size, vocab_size)
char_to_ix = { ch:i for i,ch in enumerate(chars) }
ix_to_char = { i:ch for i,ch in enumerate(chars) }

This line:
Code:
char_to_ix = { ch:i for i,ch in enumerate(chars) }

creates a Dictionary called "char_to_ix" that has for its keys, each character from the list "chars". The corresponding values are numbers from 0 to len(chars)-1.

This line:

Code:
ix_to_char = { i:ch for i,ch in enumerate(chars) }

creates a Dictionary called "ix_to_char" that has the reverse key/value pairs as those of "char_to_ix". So each key of "ix_to_char" is a number from 0 to len(chars)-1 and its value is a character from the list "chars".
This User Gave Thanks to durden_tyler For This Post:
1Brajesh
 

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LEARN ABOUT REDHAT

qtextdecoder

QTextDecoder(3qt)														 QTextDecoder(3qt)

NAME

       QTextDecoder - State-based decoder

SYNOPSIS

       All the functions in this class are reentrant when Qt is built with thread support.</p>

       #include <qtextcodec.h>

   Public Members
       virtual ~QTextDecoder ()
       virtual QString toUnicode ( const char * chars, int len ) = 0

DESCRIPTION

       The QTextDecoder class provides a state-based decoder.

       The decoder converts a text format into Unicode, remembering any state that is required between calls.

       See also QTextCodec::makeEncoder() and Internationalization with Qt.

MEMBER FUNCTION DOCUMENTATION

QTextDecoder::~QTextDecoder () [virtual]
       Destroys the decoder.

QString QTextDecoder::toUnicode ( const char * chars, int len ) [pure virtual]
       Converts the first len bytes in chars to Unicode, returning the result.

       If not all characters are used (e.g. if only part of a multi-byte encoding is at the end of the characters), the decoder remembers enough
       state to continue with the next call to this function.

SEE ALSO

       http://doc.trolltech.com/qtextdecoder.html http://www.trolltech.com/faq/tech.html

COPYRIGHT

       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included in the distribution for a complete license
       statement.

AUTHOR

       Generated automatically from the source code.

BUGS

       If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html.  Good bug reports help us to help you.
       Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially
       supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.  Please include the name of the manual page
       (qtextdecoder.3qt) and the Qt version (3.1.1).

Trolltech AS							  9 December 2002						 QTextDecoder(3qt)
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