Python 3: Write newlines to HTML

Question

I have upgraded to Python 3 and can't figure out how to convert backslash escaped newlines to HTML.

The browser renders the backslashes literally, so "\n" has no effect on the HTML source. As a result, my source page is all in one long line and impossible to diagnose.

Solution 1

The solution is:

#!/usr/bin/python 
 import sys 
 def print(s): return sys.stdout.buffer.write(s.encode('utf-8'))
 print("Content-type:text/plain;charset=utf-8\n\n") 
 print('晉\n') 

See the original discussion here: http://groups.google.com/group/comp.lang.python/msg/f8bba45e55fe605c

Solution 2

normally I do like this s=s.replace("\n","<br />\n")

because

<br /> is needed in web page display and

\n is needed in source display.

just my 2 cents

Comments

[Brian R. Bondy]

I would suggest to first replace \r\n with \n and then \n with <br/> so you don't end up with some \r in your string.

[Gnarlodious]

This does not work since my output does not already have newlines in it. In any case, apparently Python 3 does not convert UNIX style escaped characters into the appropriate ASCII characters.

[Gnarlodious]

This does not work since I am assembling strings and returning the result. If I were printing directly from the script it might be OK.

[Gnarlodious]

Yes, in fact newlines ARE working! It seems that I am saying<br> <pre>print("Content-type:text/html\n\n", HTML.encode("utf-8"))</pre><br>so the conversion to UTF8 is wiping out my newlines! And actually, Python 3 is all about UTF8, so that conversion is unnecessary. However, removing the conversion gives me error:<br> <pre> UnicodeEncodeError: 'ascii' codec can't encode character '\u8e47' in position 14525: ordinal not in range(128)<pre><br>So what is happening? Can anyone tell me how to format text on this site?

[YOU]

how about =s.replace("
","\n") Gnarlodious?

[user1066101]

@Gnarlodious: The question "backslash escaped newlines". Does that mean "\\n"? A backslash character () and an n? If so, replace( "\\n", "<br />" ) would work.

[PaulMcG]

@S.Lott - G'odious is saying that his HTML source has no newlines in it, so the substitution string should put in a newline too. In fact, it's not clear that he/she want the HTML <BR>s in there, just not all the HTML on one line. I think the desired code is s = s.replace(r'\n','\n').

[Chris Cooper]

If you mark this answer as correct, more people will see it! :)