How do I print using format that padded space ?

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June 17th, 2004, 05:47 PM

linh

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How do I print using format that padded space between printed value ?

root:/home/python_code# ./range_and_len.py

I would like to see the column line up straight regardless
of how many characters list[i] has

Code:


=============================
i subscript,   list[i],     len(list[i]),     len(list)

0              cat                3            3
1              window                6            3
2              idiosyncrasy                12            3


#!/usr/bin/python

import re
import os
import os.path
import sys
import string

list = ['cat', 'window', 'idiosyncrasy']

print "====================\n"

print "i subscript,   list[i],     len(list[i]),     len(list)\n"

for i in range(len(list)):
   print i, " "*12, list[i], " "*14, len(list[i]), " "*10, len(list)

Last edited by linh : June 17th, 2004 at 06:00 PM.

June 18th, 2004, 02:41 AM

DevCoach

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There are two alternatives:

1) use the string ljust, rjust or center methods to pad the strings to the requires length.

2) format using the % operator with the minimum width and precision set to the same values, e.g. "%10.10s" % var.

I am in a hurry so can't provide a full example - RTFM.

Dave - The Developers' Coach

June 18th, 2004, 12:06 PM

linh

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reply

Hi DevCoach and thank you for your help. I did tried the solution as you have suggested, but it still not line up when printed.

print i, " "*12, list[i], "%10.10s" % len(list[i]), " "*10, len(list)

June 18th, 2004, 01:38 PM

Random

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Hi,

I am sure there must be a much better way to do this, but i just wanted to try it this way.

Code:

for i in range(len(list)):
	space = len(list[i])
	if space > 9:
		tab = 14
	else:
		tab = 15
	
	print i, " "*12, list[i], " "*(12-space), len(list[i]), " "*tab, len(list)

Random

June 18th, 2004, 03:11 PM

linh

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reply

Hi Random. Thank you for your help.

June 18th, 2004, 04:50 PM

Strike

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Code:

>>> L = ['cat', 'window', 'idiosyncrasy']
>>> for n, item in enumerate(L):
	print "%12s%14s%10s%10s" % (n, item, len(item), len(L))

	
           0           cat         3         3
           1        window         6         3
           2  idiosyncrasy        12         3

And if you need it left justified, you can use the ljust string method.

Code:

>>> for n, item in enumerate(L):
	print "%s%s%s%s" % (str(n).ljust(12), str(item).ljust(14), str(len(item)).ljust(10), str(len(L)).ljust(10))

	
0           cat           3         3         
1           window        6         3         
2           idiosyncrasy  12        3

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June 18th, 2004, 05:46 PM

linh

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Strike

Hi Strike. I ran the code, but it gives me an error.
NameError: name 'enumerate' is not defined

Code:

L = ['cat', 'window', 'idiosyncrasy']
for n, item in enumerate(L):
  print "%12s%14s%10s%10s" % (n, item, len(item), len(L))


NameError: name 'enumerate' is not defined

June 18th, 2004, 06:33 PM

DevCoach

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Quote:

Hi Strike. I ran the code, but it gives me an error.
NameError: name 'enumerate' is not defined

The enumerate built-in function was added in Python 2.3. I suggest you upgrade if you can.

Dave - The Developers' Coach

June 18th, 2004, 06:38 PM

DevCoach

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Quote:

Originally Posted by Strike

And if you need it left justified, you can use the ljust string method.

Code:

>>> for n, item in enumerate(L):
	print "%s%s%s%s" % (str(n).ljust(12), str(item).ljust(14), str(len(item)).ljust(10), str(len(L)).ljust(10))

	
0           cat           3         3         
1           window        6         3         
2           idiosyncrasy  12        3

A better way is to use the '-' flag in the % operator:

Code:

>>> for n, item in enumerate(L):
... 	print "%-12s%-14s%-10s%-10s" % (n, item, len(item), len(L))
... 	
0           cat           3         3         
1           window        6         3         
2           idiosyncrasy  12        3

Dave - The Developers' Coach

How do I print using format that padded space ?

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