Author gvanrossum
Recipients Jim.Jewett, berker.peksag, corona10, gvanrossum, serhiy.storchaka, xtreak
Date 2020-07-27.23:21:48
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Whether the data was retrieved over a network has nothing to do with it.

There are complementary ways of guessing what data you are working with -- guess based on the filename extension or sniff based on the contents of the file (or downloaded data).

There are a zillion reasons why the filename could be a lie -- e.g. a user could pick the wrong extension, or rename a file, or a tool could save a file using the wrong extension or no extension at all. Then again sometimes the contents of the file might not be enough, e.g.
```
foo() // bar
```
is both valid Python and valid JavaScript. :-)
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Date User Action Args
2020-07-27 23:21:48gvanrossumsetrecipients: + gvanrossum, berker.peksag, Jim.Jewett, serhiy.storchaka, corona10, xtreak
2020-07-27 23:21:48gvanrossumsetmessageid: <1595892108.58.0.891045448425.issue40841@roundup.psfhosted.org>
2020-07-27 23:21:48gvanrossumlinkissue40841 messages
2020-07-27 23:21:48gvanrossumcreate