ImportError: No module named Adafruit_SSD1306 Update

[Peter J. Holzer]

On 2019-12-05 19:30:31 +0000, Rhodri James wrote:
> On 05/12/2019 18:49, RobH wrote:
> > TabError: inconsistent use of tabs and spaces in indentation
> 
> The problem will be that you have a mix of tabs and spaces in your
> indentation.  This causes problems because some people don't think that the
> One True Tab Width is 8 characters ;-) so to them the indentation looks
> ragged.  Worse, when they mix tabs and spaces, code that looks to be at the
> same indentation level to them looks different to the interpreter.  The
> decision was taken a while ago that Python should put its foot down about
> this, and demand that we use either all tabs or all spaces for our
> indentation.

At least as of Python 3.7, this is not true: You can mix spaces and tabs
in the same line. The mix just has to be consistent between lines. So
for example:

  1 #!/usr/bin/python3
  2 
  3 def f(a, b, c):
  4     if a < b:
  5 »·······if b < c:
  6 »·······    print("x")
  7 »·······else:
  8 »·······    print("y")

(I have configured vim to display a tab as a right guillemet followed by
middle dots and simply pasted that into this message)

produces the error message:

      File "./indent3", line 5
        if b < c:
                ^
    TabError: inconsistent use of tabs and spaces in indentation

because depending on the tab width line 5 might be more or less indented
than line 4.

(I don't actually understand the rules here: I constructed a very
similar example before that the same python interpreter accepted.)

However, this works:

  1 #!/usr/bin/python3
  2
  3 def f(a, b, c):
  4     if a < b:
  5     »···if b < c:
  6     »···    print("x")
  7     »···else:
  8     »···    print("y")


I would recommend to avoid that and stick to either tabs or spaces
(personally, I prefer spaces). You might want to use an editor which
can display tabs specially (like vim).

        hp

-- 
   _  | Peter J. Holzer    | Story must make more sense than reality.
|_|_) |                    |
| |   | hjp at hjp.at         |    -- Charles Stross, "Creative writing
__/   | http://www.hjp.at/ |       challenge!"
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