Message355914
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 "<stdin>", line 1, in <module>
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? |
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Date |
User |
Action |
Args |
2019-11-03 23:31:18 | David Goldsmith | set | recipients:
+ David Goldsmith, docs@python |
2019-11-03 23:31:18 | David Goldsmith | set | messageid: <1572823878.46.0.558548649113.issue38678@roundup.psfhosted.org> |
2019-11-03 23:31:18 | David Goldsmith | link | issue38678 messages |
2019-11-03 23:31:18 | David Goldsmith | create | |
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