CODEWITHSUNDEEP
pythonline-breaksreadlines
Yotam
Yotam

Reputation: 10485

How to read a file without newlines?

In Python, calling e.g. temp = open(filename,'r').readlines() results in a list in which each element is a line from the file. However, these strings have a newline character at the end, which I don't want.

How can I get the data without the newlines?

Upvotes: 702

Views: 846489

Answers (15)

Victor Eke
Victor Eke

Reputation: 465

I think the most straightforward solution is calling the splitlines() function on the file object.

Here's a modification of your code:

temp = open(filename,'r').read().splitlines()

This will return a list of all the lines in the file as a string, with each line breaking at \n. Essentially, it will eliminate all line breaks.

Reference: https://docs.python.org/3.11/library/stdtypes.html#str.splitlines

Upvotes: 0

YScharf
YScharf

Reputation: 2012

To get rid of trailing end-of-line (/n) characters and of empty list values (''), try:

f = open(path_sample, "r")
lines = [line.rstrip('\n') for line in f.readlines() if line.strip() != '']
f.close()

Upvotes: 1

SMBiggs
SMBiggs

Reputation: 11688

If you still want to use readline(), you can strip the newline as you read each line. It seems both intuitive and seems to fit the python style (at least to me).

file = open("foo", "r")
aLineOfText = file.readLine().strip('\n')

Put this in a loop if you have to read multiple lines. This is a good work-around if the file is too big to be read into memory in one swoop.

Upvotes: 0

user14534957
user14534957

Reputation: 408

Use pathlib.Path.read_text(), this opens the file in text mode, reads it and closes the file.

from pathlib import Path

temp = Path(filename).read_text()

Upvotes: 1

vivek
vivek

Reputation: 5219

temp = open(filename,'r').read().split('\n')

Upvotes: 101

David Gilbertson
David Gilbertson

Reputation: 4853

My preferred one-liner -- if you don't count from pathlib import Path :)

lines = Path(filename).read_text().splitlines()

This it auto-closes the file, no need for with open()...

Added in Python 3.5.

https://docs.python.org/3/library/pathlib.html#pathlib.Path.read_text

Upvotes: 13

marbel
marbel

Reputation: 7714

You can read the file as a list easily using a list comprehension

with open("foo.txt", 'r') as f:
    lst = [row.rstrip('\n') for row in f]

Upvotes: 2

Abdelrahman Saleh
Abdelrahman Saleh

Reputation: 300

This script here will take lines from file and save every line without newline with ,0 at the end in file2.

file = open("temp.txt", "+r")
file2 = open("res.txt", "+w")
for line in file:
    file2.writelines(f"{line.splitlines()[0]},0\n")
file2.close()

if you looked at line, this value is data\n, so we put splitlines()

to make it as an array and [0] to choose the only word data

Upvotes: -2

O-9
O-9

Reputation: 1769

Reading file one row at the time. Removing unwanted chars from end of the string with str.rstrip(chars).

with open(filename, 'r') as fileobj:
    for row in fileobj:
        print(row.rstrip('\n'))

See also str.strip([chars]) and str.lstrip([chars]).

Upvotes: 37

Bakuriu
Bakuriu

Reputation: 101919

You can read the whole file and split lines using str.splitlines:

temp = file.read().splitlines()

Or you can strip the newline by hand:

temp = [line[:-1] for line in file]

Note: this last solution only works if the file ends with a newline, otherwise the last line will lose a character.

This assumption is true in most cases (especially for files created by text editors, which often do add an ending newline anyway).

If you want to avoid this you can add a newline at the end of file:

with open(the_file, 'r+') as f:
    f.seek(-1, 2)  # go at the end of the file
    if f.read(1) != '\n':
        # add missing newline if not already present
        f.write('\n')
        f.flush()
        f.seek(0)
    lines = [line[:-1] for line in f]

Or a simpler alternative is to strip the newline instead:

[line.rstrip('\n') for line in file]

Or even, although pretty unreadable:

[line[:-(line[-1] == '\n') or len(line)+1] for line in file]

Which exploits the fact that the return value of or isn't a boolean, but the object that was evaluated true or false.

The readlines method is actually equivalent to:

def readlines(self):
    lines = []
    for line in iter(self.readline, ''):
        lines.append(line)
    return lines

# or equivalently

def readlines(self):
    lines = []
    while True:
        line = self.readline()
        if not line:
            break
        lines.append(line)
    return lines

Since readline() keeps the newline also readlines() keeps it.

Note: for symmetry to readlines() the writelines() method does not add ending newlines, so f2.writelines(f.readlines()) produces an exact copy of f in f2.

Upvotes: 979

RENZO
RENZO

Reputation: 283

I think this is the best option.

temp = [line.strip() for line in file.readlines()]

Upvotes: 25

Necriss
Necriss

Reputation: 9

my_file = open("first_file.txt", "r")
for line in my_file.readlines():
    if line[-1:] == "\n":
        print(line[:-1])
    else:
        print(line)
my_file.close()

Upvotes: -2

Nitesh Soni
Nitesh Soni

Reputation: 61

Try this:

u=open("url.txt","r")  
url=u.read().replace('\n','')  
print(url)

Upvotes: 2

Marcel
Marcel

Reputation: 3258

temp = open(filename,'r').read().splitlines()

Upvotes: 14

srus
srus

Reputation: 319

import csv

with open(filename) as f:
    csvreader = csv.reader(f)
    for line in csvreader:
         print(line[0])

Upvotes: -3

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