Rick van Hattem
75 lines
2.0 KiB
ReStructuredText
75 lines
2.0 KiB
ReStructuredText
>>> import builtins
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>>> builtin_vars = vars(builtins)
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>>> key = 'something to search for'
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>>> if key in locals():
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... value = locals()[key]
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... elif key in globals():
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... value = globals()[key]
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... elif key in builtin_vars:
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... value = builtin_vars[key]
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... else:
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... raise NameError(f'name {key!r} is not defined')
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Traceback (most recent call last):
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...
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NameError: name 'something to search for' is not defined
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##############################################################################
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>>> mappings = locals(), globals(), vars(builtins)
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>>> for mapping in mappings:
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... if key in mapping:
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... value = mapping[key]
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... break
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... else:
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... raise NameError(f'name {key!r} is not defined')
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Traceback (most recent call last):
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...
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NameError: name 'something to search for' is not defined
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##############################################################################
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>>> import collections
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>>> mappings = collections.ChainMap(
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... locals(), globals(), vars(builtins))
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>>> mappings[key]
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Traceback (most recent call last):
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...
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KeyError: 'something to search for'
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##############################################################################
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>>> import json
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>>> import pathlib
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>>> import argparse
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>>> import collections
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>>> DEFAULT = dict(verbosity=1)
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>>> config_file = pathlib.Path('config.json')
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>>> if config_file.exists():
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... config = json.load(config_file.open())
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... else:
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... config = dict()
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('-v', '--verbose', action='count',
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... dest='verbosity')
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_CountAction(...)
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>>> args, _ = parser.parse_known_args(args=['-v'])
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>>> defined_args = {k: v for k, v in vars(args).items() if v}
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>>> combined = collections.ChainMap(defined_args, config, DEFAULT)
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>>> combined['verbosity']
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1
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>>> args, _ = parser.parse_known_args(['-vv'])
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>>> defined_args = {k: v for k, v in vars(args).items() if v}
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>>> combined = collections.ChainMap(defined_args, config, DEFAULT)
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>>> combined['verbosity']
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2
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