print lists in a file in a special format in python

Question

I have a large list of lists like:

X = [['a','b','c','d','e','f'],['c','f','r'],['r','h','l','m'],['v'],['g','j']]

each inner list is a sentence and the members of these lists are actually the word of this sentences.I want to write this list in a file such that each sentence(inner list) is in a separate line in the file, and each line has a number corresponding to the placement of this inner list(sentence) in the large this. In the case above. I want the output to look like this:

1. a b c d e f
2. c f r
3. r h l m
4.v
5.g j

I need them to be written in this format in a "text" file. Can anyone suggest me a code for it in python? Thanks

Ignacio Vazquez-Abrams · Accepted Answer · 2010-10-29 11:21:16Z

5

with open('somefile.txt', 'w') as fp:
  for i, s in enumerate(X):
    print >>fp, '%d. %s' % (i + 1, ' '.join(s))

answered Oct 29, 2010 at 11:21

Ignacio Vazquez-Abrams

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3 Comments

Katriel Over a year ago

or fp.write("{row}. {sentence}\n".format(row=i, sentence=' '.join(s))) if you don't like the >> print syntax.

Hossein Over a year ago

There is a slight problem with that, the counter starts with 2 always!

Hossein Over a year ago

print >>fp, '%d. %s' % (i, ' '.join(s)) i += 1 will do the job ;)

seriyPS · Accepted Answer · 2010-10-29 11:50:19Z

0

with open('file.txt', 'w') as f:
    i=1
    for row in X:
        f.write('%d. %s'%(i, ' '.join(row)))
        i+=1

answered Oct 29, 2010 at 11:50

seriyPS

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4 Comments

Ignacio Vazquez-Abrams Over a year ago

You're missing the linebreaks.

Katriel Over a year ago

enumerate is there for a reason.

seriyPS Over a year ago

I'm not sure that enumerate() will create generator object, so enumerate() can take a lot of memory/cpu for large lists. If enumerate() will create a generator, previous example can be preferable.

bstpierre Over a year ago

It's an easy thing to look up in the docs and/or test. enumerate: Return an enumerate object.

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