\N in the End of Line with Using Print

\n in the end of line with using print

The default terminator for print is the newline "\n".

You can specify that you do not want any terminator like this:

print("hello", terminator: "")

And since you're in a Playground, open the "Debug Area" to see the print result in the console: the side panel is a preview and doesn't work the same way.

For example, this sequence:

print("hello")
print("hello", terminator: "")
print("hello")

Gives:

hello

hellohello

in the debug area, but will show:

"hello\n"

"hello"

"hello\n"

in the preview panel.

Extra newline output when using print() in Python

When reading file with this idiom:

with open("line.txt") as f:
    for line in f:

The line comes with a \n character at the end.

Try this:

with open("line.txt") as f:
    for line in f:
        line = line.strip()  # Removes the "\n" character
        for word in line.split():
            if word == 'Way':
                line = line.replace("Way", "Street")
        print(line, end="\n") # Puts back the "\n" character.

Or you can use print(line, end=""). By default, print() ends with a \n char, you can specify the the end="" to be to avoid the extra newline with the line isn't striped when reading, i.e.

with open("line.txt") as f:
    for line in f:
        for word in line.split():
            if word == 'Way':
                line = line.replace("Way", "Street")
        print(line, end="")

Print \n or newline characters as part of the output on terminal

Use repr

>>> string = "abcd\n"
>>> print(repr(string))
'abcd\n'

How to print without a newline or space

In Python 3, you can use the sep= and end= parameters of the print function:

To not add a newline to the end of the string:

print('.', end='')

To not add a space between all the function arguments you want to print:

print('a', 'b', 'c', sep='')

You can pass any string to either parameter, and you can use both parameters at the same time.

If you are having trouble with buffering, you can flush the output by adding flush=True keyword argument:

print('.', end='', flush=True)

Python 2.6 and 2.7

From Python 2.6 you can either import the print function from Python 3 using the __future__ module:

from __future__ import print_function

which allows you to use the Python 3 solution above.

However, note that the flush keyword is not available in the version of the print function imported from __future__ in Python 2; it only works in Python 3, more specifically 3.3 and later. In earlier versions you'll still need to flush manually with a call to sys.stdout.flush(). You'll also have to rewrite all other print statements in the file where you do this import.

Or you can use sys.stdout.write()

import sys
sys.stdout.write('.')

You may also need to call

sys.stdout.flush()

to ensure stdout is flushed immediately.

How do I specify new lines in a string in order to write multiple lines to a file?

It depends on how correct you want to be. \n will usually do the job. If you really want to get it right, you look up the newline character in the os package. (It's actually called linesep.)

Note: when writing to files using the Python API, do not use the os.linesep. Just use \n; Python automatically translates that to the proper newline character for your platform.

Echo newline in Bash prints literal \n

Use printf instead:

printf "hello\nworld\n"

printf behaves more consistently across different environments than echo.

How do I print only one new line in Python? \n does not give me my desired effect

print() adds a newline. Just print without arguments:

print()

or tell it not to add a newline:

print('\n', end='')

The latter is much more verbose than it needs to be of course.

Is there any drawback to using '\n' at the start instead of end?

It is not at all "personal preference" - the two solutions are semantically different. You would use one over the other when the requirements of your application demand it.

One critical point though is on many platforms \n causes any buffered text to be flushed and the text to be output. If you delay the \n you may not see the output immediately until the next \n which may not be deterministic or timely.

How to print a linebreak in a python function?

You have your slash backwards, it should be "\n"

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