CODEWITHSUNDEEP
pythonpython-2.7
GhitaB
GhitaB

Reputation: 3437

Print multiple lines without space between lines

I have a list of lines (from a text file) to be printed in terminal. This is the format I like (without empty lines between printed lines):

>>> print("line \n" * 5)
line 
line 
line 
line 
line

This is how it looks (a line with text, an empty line, etc.):

>>> for x in range(0, 5): print "line \n"
... 
line 

line 

line 

line 

line

Any idea why it's working in this way and how to print my list of lines without empty lines between them?

UPDATE (this is where I want to get rid of empty lines):

with open(FILE, 'r') as f:
    lines = f.readlines()
    for line in lines:
        print line

Upvotes: 0

Views: 7922

Answers (6)

wim
wim

Reputation: 362756

This is actually due to the way you're reading the file. If you've done something like 

with open(FILE) as f:
    data = f.readlines()

Then the data will be a list of lines which retain the end of line character. If you don't want the end of line character, use this instead:

with open(FILE) as f:
    data = f.read().splitlines()

If you don't want to change the way that you read the data into a list, then concatenate and print the lines like this instead:

print ''.join(data)

To answer the literal question, if you have a string with a newline, and you want to suppress the newline generated by the print statement, the way to do that in Python 2 is by using a trailing comma on the print statement:

with open(FILE) as f:
    for line in f:
        print line,

But note, that's not really necessary to iterate line by line like that. You may as well just print the data directly:

with open(FILE) as f:
    print f.read()

Upvotes: 2

Todor Minakov
Todor Minakov

Reputation: 20067

By default print adds a newline, and your strings also have it; you have two possible solutions.

Either override this behaviour, setting the string to be put to empty:

# python 3.*
for x in range(0, 5): print("line \n", end="")

And 

# python 2.*
from __future__ import print_function  # to use py3 print in py2
for x in range(0, 5): print("line \n", end="")

Alternatively, if you don't have full control over the lines - some may have the newlines, other - not, trim any newline endings and leave the default behaviour:

for x in range(0, 5): print("line \n".rstrip("\n").rstrip("\r"))  # takes care of also Windows line ending, just in case

Upvotes: 1

Steve Barnes
Steve Barnes

Reputation: 28380

A standard call to the print function will add a newline automatically so you can either remove the \n from your existing line(s), if the lines come from an external file use line.strip(), or tell print not to add the newline with: print(line, end='')

This will work for Python3 or for 2.7 with from __future__ import print_function as the first code line.

Upvotes: 0

c2huc2hu
c2huc2hu

Reputation: 2497

print adds a trailing newline by default. You can disable it as follows:

from __future__ import print_function  # only needed for python 2
print("string", end="")

Upvotes: 2

Ébe Isaac
Ébe Isaac

Reputation: 12341

The print command implicitly adds a new line feed \n in the output display. Remove the \n to avoid printing blank lines in the looping structure.

Upvotes: 1

Max
Max

Reputation: 1363

When using a for loop you can remove "\n" as follows

for x in range(0, 5): print "line"

Upvotes: 1

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