read lines without the line break character at the end?

[Wai Yip Tung]

When I do

for line in fp:

the line string usually has a '\n' at the end. In many cases I don't want
the line break character. I can trim it using

if line.endswith('\n'): line = line[:-1]

Given I do it so frequently I wonder if there is some builtin way to say I
don't wnt the line break character?

Thanks,

tung

 

[Michael Hudson]

When I do

for line in fp:

the line string usually has a '\n' at the end. In many cases I don't
want the line break character. I can trim it using

if line.endswith('\n'): line = line[:-1]

Given I do it so frequently I wonder if there is some builtin way to
say I don't wnt the line break character?

No. line.rstrip('\n') is a shorter way of trimming the newline
character, though.

I guess adding

def without_newlines(thing):
for line in thing:
yield line.rstrip('\n')

to your snippet collection will do.

Cheers,
mwh

 

[Paul McGuire]

When I do

for line in fp:

the line string usually has a '\n' at the end. In many cases I don't want
the line break character. I can trim it using

if line.endswith('\n'): line = line[:-1]

Given I do it so frequently I wonder if there is some builtin way to say I
don't wnt the line break character?

If you have a lot of lines, you will be better off testing the value of
line[-1] instead of using endswith(). Here's some timeit results:

line.endswith('\n')
0.124841844424

line[-1] == '\n'
0.057334940614


-- Paul

 

[Wai Yip Tung]

Thanks, I like the rstrip() syntax. Coming from Java background. I made
too many mistakes forgetting to strip the '\n' before using the string.

When I do

for line in fp:

the line string usually has a '\n' at the end. In many cases I don't
want the line break character. I can trim it using

if line.endswith('\n'): line = line[:-1]

Given I do it so frequently I wonder if there is some builtin way to
say I don't wnt the line break character?

No. line.rstrip('\n') is a shorter way of trimming the newline
character, though.

I guess adding

def without_newlines(thing):
for line in thing:
yield line.rstrip('\n')

to your snippet collection will do.

Cheers,
mwh

 

[Stan Cook]

try for line in fp:
whatever line[:-1] etc etc

Whatever you're doing with the line, the new line character will be gone.


Stan

 

[Andrew Dalke]

try for line in fp:
whatever line[:-1] etc etc

Whatever you're doing with the line, the new line character will be gone.

Except that 1) you should open the file in "U"niversal
mode, and 2) this will chop the last character from the
last line in the file if the file doesn't end with
a newline.

Andrew
(e-mail address removed)