CODEWITHSUNDEEP
pythonfor-loop
Johnnerz
Johnnerz

Reputation: 1425

remove blank lines from for loop python

I have numerous lines getting printed out in python from for loops like below:

class Wordnet():

    def compose_line6(self, pointers, pointers_synset_type):    
        for A, B in zip(pointers, pointers_synset_type):
            self.line6 += 'http://www.example.org/lexicon#'+A+' http://www.monnetproject.eu/lemon#pos '+B+'\n'
        return self.line6

    def compose_line7(self, pointers, pointer_source_target):
        for A, B in zip(pointers, pointer_source_target):
            self.line7 += 'http://www.example.org/lexicon#'+A+' http://www.monnetproject.eu/lemon#source_target '+B+'\n'
        return self.line7

The '\n' is there so that the for loops don't just get printed out in a big block, but this also add a blank line to the end of each loop. printing these at the moment using this method:

def compose_contents(self, line1, line2, line3, line4, line5, line6, line7):
    self.contents = '\n'.join([line1, line2, line3, line4, line5, line6, line7])
    return self.contents

and printing self.contents gives this:

http://www.example.org/lexicon#13796604 http://www.monnetproject.eu/lemon#pos n
http://www.example.org/lexicon#00603894 http://www.monnetproject.eu/lemon#pos a
http://www.example.org/lexicon#00753137 http://www.monnetproject.eu/lemon#pos v
http://www.example.org/lexicon#01527311 http://www.monnetproject.eu/lemon#pos v
http://www.example.org/lexicon#02361703 http://www.monnetproject.eu/lemon#pos v

http://www.example.org/lexicon#13796604 http://www.monnetproject.eu/lemon#source_target 0000
http://www.example.org/lexicon#00603894 http://www.monnetproject.eu/lemon#source_target 0401
http://www.example.org/lexicon#00753137 http://www.monnetproject.eu/lemon#source_target 0302
http://www.example.org/lexicon#01527311 http://www.monnetproject.eu/lemon#source_target 0203
http://www.example.org/lexicon#02361703 http://www.monnetproject.eu/lemon#source_target 0101

How do avoid the blank line in the middle of the print()?

EDIT: all of these methods are called in a for loop def line_for_loop(self, file): for line in file: self.compose_line6(self.pointers, self.pointers_synset_type) self.compose_line7(self.pointers, self.pointer_source_target) self.compose_contents(self.line1, self.line2, self.line3, self.line4, self.line5, self.line6, self.line7)

and the print is print wordnet.contents

Upvotes: 0

Views: 1562

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1124438

Filter out empty lines:

def compose_contents(self, *lines):
    self.contents = '\n'.join([line for line in lines if line.strip()])
    return self.contents

This supports an arbitrary number of input lines by using the *args arbitrary positional argument syntax.

Upvotes: 2

Related Questions