删除一长串文本中的所有换行符

Basically, I’m asking the user to input a string of text into the console, but the string is very long and includes many line breaks. How would I take the user’s string and delete all line breaks to make it a single line of text. My method for acquiring the string is very simple.

string = raw_input("Please enter string: ")

Is there a different way I should be grabbing the string from the user? I’m running Python 2.7.4 on a Mac.

P.S. Clearly I’m a noob, so even if a solution isn’t the most efficient, the one that uses the most simple syntax would be appreciated.

How do you enter line breaks with raw_input? But, once you have a string with some characters in it you want to get rid of, just replace them.

>>> mystr = raw_input('please enter string: ')
please enter string: hello world, how do i enter line breaks?
>>> # pressing enter didn't work...
...
>>> mystr
'hello world, how do i enter line breaks?'
>>> mystr.replace(' ', '')
'helloworld,howdoienterlinebreaks?'
>>>

In the example above, I replaced all spaces. The string '\n' represents newlines. And \r represents carriage returns (if you’re on windows, you might be getting these and a second replace will handle them for you!).

basically:

# you probably want to use a space ' ' to replace `\n`
mystring = mystring.replace('\n', ' ').replace('\r', '')

Note also, that it is a bad idea to call your variable string, as this shadows the module string. Another name I’d avoid but would love to use sometimes: file. For the same reason.

You can try using string replace:

string = string.replace('\r', '').replace('\n', '')

You can split the string with no separator arg, which will treat consecutive whitespace as a single separator (including newlines and tabs). Then join using a space:

In : " ".join("\n\nsome    text \r\n with multiple whitespace".split())
Out: 'some text with multiple whitespace'

https://docs.python.org/2/library/stdtypes.html#str.split

updated based on Xbello comment:

string = my_string.rstrip('\r\n')

read more here

Another option is regex:

>>> import re
>>> re.sub("\n|\r", "", "Foo\n\rbar\n\rbaz\n\r")
'Foobarbaz'

A method taking into consideration

• additional white characters at the beginning/end of string
• additional white characters at the beginning/end of every line
• various end-line characters

it takes such a multi-line string which may be messy e.g.

test_str = '\nhej ho \n aaa\r\n   a\n '

and produces nice one-line string

>>> ' '.join([line.strip() for line in test_str.strip().splitlines()])
'hej ho aaa a'

UPDATE: To fix multiple new-line character producing redundant spaces:

' '.join([line.strip() for line in test_str.strip().splitlines() if line.strip()])

This works for the following too test_str = '\nhej ho \n aaa\r\n\n\n\n\n a\n '

If anybody decides to use replace, you should try r'\n' instead '\n'

mystring = mystring.replace(r'\n', ' ').replace(r'\r', '')

The problem with rstrip is that it does not work in all cases (as I myself have seen few). Instead you can use – text= text.replace(“\n”,” “) this will remove all new line \n with a space.

Thanks in advance guys for your upvotes.