about textarea \r\n or \n in python
Question: i have tested code in firefox under ubuntu:

the frontend is a textarea,in textarea press the key ENTER,then submit to the
server,

on the backend you'll get find \r\n string

    
    
    r=request.POST.get("t")
    r.find("\r\n")>-1:
        print "has \r\n"
    

my question is when we will get \r\n ,when we'll get \n?is this platform
independent?

this is important when want to use this string to use as a regular
expression,any adivse is welcome


Answer: Yes, you are correct, you are dealing with a platform-specific ways to encode
a newline:

  * In Windows platforms, a newline is typically encoded as `\r\n`
  * In Linux/Unix/OS X, a newline is typically encoded as `\n`

Similarly, web browsers tend to favor these conventions: IE uses `\r\n`
newlining, whereas Safari and Firefox use `\n`.

As a solution, considering using Python functions that are aware of different
new line encodings, e.g. provide a universal newline support.

For instance if you want to split a string into lines, use splitlines:

    
    
    lines = r.splitlines()
    

