[Python-ideas] Draft PEP on string interpolation

[Nikolaus Rath]

On Aug 25 2015, Mike Miller <python-ideas-9N9vo3BbZlHk1uMJSBkQmQ at public.gmane.org> wrote:
> On 08/25/2015 08:02 AM, Nikolaus Rath wrote:
>> No, but it muddles the water as to what is good and what is bad
>> practice. 'rm {file}' has always been bad practice, but with e-strings
>> e'rm {file}' may or may not be bad practice, depending what you do with
>> it.
>
> It would be bad practice since the function is deprecated, or just
> discouraged.

What function?

> But, are you implying that the escaping could be bypassed?  Would that
> be possible?

According to you, yes. Just look at your example:

|     def os_system(command):   # imagine os.system, subprocess, dbapi, etc.
|         if isinstance(command, estr):
|             command = command.escape(shlex.quote)  # each chooses its own rules
|         do_something(command)


So any function that doesn't special-case estr will "bypass" the
escaping and pass it do it's version of the do_something() function
without quoting.

Best,
-Rikolaus

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