Fillmore <fillmore_rem...@hotmail.com> writes:
> On 3/11/2016 2:23 PM, MRAB wrote:
> > Python 3 (Unicode) strings have an .isprintable method:
> >
> > mystring.isprintable()
>
> my strings are UTF-8. Will it work there too?
You need to always be clear on the difference between text (the Python 3
‘str’ type) versus bytes.
It only makes sense to talk about an encoding, when talking about bytes.
Text itself is an abstract data type; the content of a Unicode string
does not have any encoding because it is not encoded.
The content of a byte stream (such as a file's content) is not text, it
is bytes.
>>> foo = "こんにちは"
>>> foo.isprintable()
True
>>> foo_encoded = foo.encode("utf-8")
>>> foo_encoded.isprintable()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'bytes' object has no attribute 'isprintable'
You can only ask ‘isprintable’ about text. Bytes are not printable
because bytes are not text; you need to decode the bytes to text before
asking whether that text is printable.
>>> infile = open('lorem.txt', 'rb')
>>> infile_bytes = infile.read()
>>> infile_bytes.isprintable()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'bytes' object has no attribute 'isprintable'
>>> infile = open('lorem.txt', 'rt', encoding="utf-8")
>>> infile_text = infile.read()
>>> infile_text.isprintable()
True
--
\ “Telling pious lies to trusting children is a form of abuse, |
`\ plain and simple.” —Daniel Dennett, 2010-01-12 |
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Ben Finney
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