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Underlining in Perl and Python - the x and * operator in use

Perl's x operator - yes, that is the letter x - is used to replicate the string on the left the number of times given to the right. "What use is THAT" I have been asked in the past, by delegates feeling that it's a solution looking for a problem. Well - as an example, it's a great way to output just enough "-" characters - or anything else in a fixed with font - to underline a title.


print "Your name? " ;
chop ($name = <STDIN>);
 
print $name,"\n";
print "-" x length($name),"\n";


And here I am testing that ...

Dorothy:qc2 grahamellis$ perl titlit
Your name? Graham
Graham
------
Dorothy:qc2 grahamellis$ perl titlit
Your name? Graham Ellis
Graham Ellis
------------
Dorothy:qc2 grahamellis$


In Python, the * operator on a string object will achieve the same goal:

line = raw_input("your name ")
print line
print "-" * len(line)


And running that ...

Dorothy:qc2 grahamellis$ python pytit
your name Python Trainer
Python Trainer
--------------
Dorothy:qc2 grahamellis$ python pytit
your name Perl Trainer
Perl Trainer
------------
Dorothy:qc2 grahamellis$





(written 2008-04-12)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P205 - Perl - Initial String Handling
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  [3411] Single and double quotes strings in Perl - what is the difference? - (2011-08-30)
  [3005] Lots of ways of doing it in Perl - printing out answers - (2010-10-19)
  [2963] Removing the new line with chop or chomp in Perl - what is the difference? - (2010-09-21)
  [2832] Are you learning Perl? Some more examples for you! - (2010-06-27)
  [2816] Intelligent Matching in Perl - (2010-06-18)
  [2798] Perl - skip the classics and use regular expressions - (2010-06-08)
  [1860] Seven new intermediate Perl examples - (2008-10-30)
  [1849] String matching in Perl with Regular Expressions - (2008-10-20)
  [1195] Regular Express Primer - (2007-05-20)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [324] The backtick operator in Python and Perl - (2005-05-25)
  [254] x operator in Perl - (2005-03-22)
  [31] Here documents - (2004-08-28)

Y108 - Python - String Handling
  [4213] Formatting options in Python - (2013-11-16)
  [4152] Why are bus fares so high? - (2013-08-18)
  [4027] Collections in Python - list tuple dict and string. - (2013-03-04)
  [3886] Formatting output - why we need to, and first Python example - (2012-10-09)
  [3796] Backquote, backtic, str and repr in Python - conversion object to string - (2012-07-05)
  [3469] Teaching dilemma - old tricks and techniques, or recent enhancements? - (2011-10-08)
  [3468] Python string formatting - the move from % to str.format - (2011-10-08)
  [3349] Formatting output in Python through str.format - (2011-07-07)
  [3218] Matching a license plate or product code - Regular Expressions - (2011-03-28)
  [3090] Matching to a string - what if it matches in many possible ways? - (2010-12-17)
  [2814] Python - splitting and joining strings - (2010-06-16)
  [2780] Formatted Printing in Python - (2010-05-25)
  [2765] Running operating system commands from your Python program - (2010-05-14)
  [2721] Regular Expressions in Python - (2010-04-14)
  [2692] Flexible search and replace in Python - (2010-03-25)
  [2406] Pound Sign in Python Program - (2009-09-15)
  [2284] Strings as collections in Python - (2009-07-12)
  [1876] Python Regular Expressions - (2008-11-08)
  [1517] Python - formatting objects - (2008-01-24)
  [1110] Python - two different splits - (2007-03-15)
  [954] Splitting Pythons in Bradford - (2006-11-29)
  [943] Matching within multiline strings, and ignoring case in regular expressions - (2006-11-25)
  [903] Pieces of Python - (2006-10-23)
  [773] Breaking bread - (2006-06-22)
  [560] The fencepost problem - (2006-01-10)
  [496] Python printf - (2005-11-15)
  [463] Splitting the difference - (2005-10-13)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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