On 3/16/2016 12:09 AM, Serhiy Storchaka wrote:
On 16.03.16 08:34, Glenn Linderman wrote:
From the PEP 263:
More precisely, the first or second line must match the regular
expression "coding[:=]\s*([-\w.]+)". The first group of this
expression is then interpreted as encoding name. If the encoding
is unknown to Python, an error is raised during compilation. There
must not be any Python statement on the line that contains the
encoding declaration.
Clearly the regular expression would only match the first of multiple
cookies on the same line, so the first one should always win... but
there should only be one, from the first PEP quote "a magic comment".
"The first group of this expression" means the first regular
expression group. Only the part between parenthesis "([-\w.]+)" is
interpreted as encoding name, not all expression.
Sure. But there is no mention anywhere in the PEP of more than one
being legal: just more than one position for it, EITHER line 1 or line
2. So while the regular expression mentioned is not anchored, to allow
variation in syntax between emacs and vim, "must match the regular
expression" doesn't imply "several times", and when searching for a
regular expression that might not be anchored, one typically expects to
find the first.
Glenn
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