[issue38675] Sug. for the scope example in TPT Cjapter 9
New submission from David Goldsmith :
In The Python Tutorial, at the end of Section 9.2.1 "Scopes and Namespaces
Example," there occurs the statement: "You can also see that there was no
previous binding for spam before the global assignment." Indeed, one can
"virtually see" this by mentally analyzing what the code is doing--if one
adequately understood the exposition given in Section 9.2--but, unless it is to
be understood by an omission in the example code's output, which is a
conclusion I myself am missing, that example code's output does not explicitly
validate this claim...and yet, with the addition of just one line to the code,
the claim can be shown explicitly: simply copy the line of code:
print("In global scope:", spam)
to precede, as well as follow (as it currently does) the line:
scope_test()
and the code output changes to:
>>> print("In global scope:", spam)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'spam' is not defined
>>> scope_test()
After local assignment: test spam
After nonlocal assignment: nonlocal spam
After global assignment: nonlocal spam
>>> print("In global scope:", spam)
In global scope: global spam
This does _explicitly_ show that "there was no previous binding for spam before
the global assignment": I respectfully suggest that this line be added to the
code and that the code's quoted output be suitably updated as well.
--
assignee: docs@python
components: Documentation
messages: 355908
nosy: David Goldsmith, docs@python
priority: normal
severity: normal
status: open
title: Sug. for the scope example in TPT Cjapter 9
type: enhancement
versions: Python 3.8
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[issue38675] Sug. for the scope example in TPT Chapter 9
Change by David Goldsmith : -- title: Sug. for the scope example in TPT Cjapter 9 -> Sug. for the scope example in TPT Chapter 9 ___ Python tracker <https://bugs.python.org/issue38675> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38678] TypeError raised trying to run TPT 10.3 Example 2 in Python 3.4.3
New submission from David Goldsmith :
When I run the second example code of Section 10.3 of The Python Tutorial:
import argparse
from getpass import getuser
parser = argparse.ArgumentParser(description='An argparse example.')
parser.add_argument('name', nargs='?', default=getuser(), help='The name of
someone to greet.')
parser.add_argument('--verbose', '-v', action='count')
args = parser.parse_args()
greeting = ["Hi", "Hello", "Greetings! its very nice to meet you"][args.verbose
% 3]
print(f'{greeting}, {args.name}')
if not args.verbose:
print('Try running this again with multiple "-v" flags!')
the greeting assignment line raises:
>>> greeting = ["Hi", "Hello", "Greetings! its very nice to meet
>>> you"][args.verbose % 3]
Traceback (most recent call last):
File "", line 1, in
TypeError: unsupported operand type(s) for %: 'NoneType' and 'int'
Is this an artifact of me being so far behind in my Python version:
Davids-MacBook-Air:~ DLG$ python3
Python 3.4.3 |Anaconda 2.4.0 (x86_64)| (default, Oct 20 2015, 14:27:51)
[GCC 4.2.1 (Apple Inc. build 5577)] on darwin
Or is it a bug in the example code in the doc?
--
assignee: docs@python
components: Documentation
messages: 355914
nosy: David Goldsmith, docs@python
priority: normal
severity: normal
status: open
title: TypeError raised trying to run TPT 10.3 Example 2 in Python 3.4.3
type: crash
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