Difference between revisions of "CSC111 Lab 5 2015"
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</source> | </source> | ||
<br /> | <br /> | ||
+ | =Splitting Long Strings= | ||
+ | <br /> | ||
+ | <tanbox> | ||
+ | In this section you will see how to take text represented as a multi-line string, and process it various ways. | ||
+ | </tanbox> | ||
+ | <br /> | ||
+ | * Long strings that span several lines can be created by enclosing them in triple quotes; either triple single-quotes ('''), or triple double-quotes ("""). | ||
+ | * Copy/paste the program below in a new program. You may call it '''lab5.py''' | ||
+ | <br /> | ||
+ | ::<source lang="python"> | ||
+ | # lab5.py | ||
+ | |||
+ | text = """Chocolate | ||
+ | Chocolate is the first luxury. | ||
+ | It has so many things wrapped up in it: | ||
+ | Deliciusness in the moment, | ||
+ | childhood memories, | ||
+ | and that grin-inducing | ||
+ | feeling of getting a reward for being good. | ||
+ | --Mariska Hargitay""" | ||
+ | |||
+ | def main(): | ||
+ | # split the long string into individual lines | ||
+ | lines = text.split( "\n" ) | ||
+ | |||
+ | # print each line | ||
+ | for line in lines: | ||
+ | print( line ) | ||
+ | |||
+ | main() | ||
+ | </source> | ||
+ | <br /> | ||
+ | * Run the program. Verify that it outputs the entirety of the text. | ||
+ | * Just to make sure we understand what the variable '''lines''' contain, make your program print it, with a simple <tt>print( lines )</tt> statement. | ||
+ | * Observe that it's just a Python '''list'''. | ||
+ | |||
+ | === | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
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Revision as of 23:58, 22 February 2015
--D. Thiebaut (talk) 12:17, 22 February 2015 (EST)
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Preparation
- Copy paste the program below in a new Idle window, and call it lab5Companion.py. Save it to your working directory, where you normally save your lab programs.
- Run the program. It should create 3 text files in your folder. You will be using them in this lab. The files are called:
- chocoQuotes.txt
- hargitay.txt
- joanneHarris.txt
# lab5Companion.py # D. Thiebaut # This program will create several files in the directory # where you will run it. # The files are retrieved from a Web server, stored temporarily # in a string, and stored in a local file on your disk. # The 3 files are very, very short. # Their names are: # - chocoQuotes.txt # - hargitay.txt # - joanneHarris.txt import urllib.request # the lib that handles the url stuff # main program def main(): # list of files to retrieve fileNames = [ "chocoQuotes.txt", "hargitay.txt", "joanneHarris.txt" ] # get each file, one at a time for fileName in fileNames: # url where the files are located url = "http://cs.smith.edu/~dthiebaut/111/files/" + fileName # fetch the file and put its contents in the # strign text. response = urllib.request.urlopen( url ) text = response.read().decode( 'UTF-8' ) # write text to file, in the same directory as this program. file = open( fileName, "w" ) file.write( text + "\n" ) file.close() # give feedback to user. print( "File {0:1} created in your folder".format( fileName ) ) main()
Splitting Long Strings
In this section you will see how to take text represented as a multi-line string, and process it various ways.
- Long strings that span several lines can be created by enclosing them in triple quotes; either triple single-quotes (), or triple double-quotes (""").
- Copy/paste the program below in a new program. You may call it lab5.py
# lab5.py text = """Chocolate Chocolate is the first luxury. It has so many things wrapped up in it: Deliciusness in the moment, childhood memories, and that grin-inducing feeling of getting a reward for being good. --Mariska Hargitay""" def main(): # split the long string into individual lines lines = text.split( "\n" ) # print each line for line in lines: print( line ) main()
- Run the program. Verify that it outputs the entirety of the text.
- Just to make sure we understand what the variable lines contain, make your program print it, with a simple print( lines ) statement.
- Observe that it's just a Python list.
=
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