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[utils] Minor updates (merge_dicts, T)
A couple of mods to ease yt-dlp back-ports: * add kwargs to merge_dicts: `unblank=True` (disallow empty string), `rev=False` (reverse the merge list) * add `T(x)` shortcut for `{x}`, unsupported in Py2.6
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@ -4269,7 +4269,8 @@ def variadic(x, allowed_types=NO_DEFAULT):
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def dict_get(d, key_or_keys, default=None, skip_false_values=True):
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exp = (lambda x: x or None) if skip_false_values else IDENTITY
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return traverse_obj(d, *variadic(key_or_keys), expected_type=exp, default=default)
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return traverse_obj(d, *variadic(key_or_keys), expected_type=exp,
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default=default, get_all=False)
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def try_call(*funcs, **kwargs):
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@ -4302,16 +4303,38 @@ def try_get(src, getter, expected_type=None):
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return v
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def merge_dicts(*dicts):
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def merge_dicts(*dicts, **kwargs):
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"""
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Merge the `dict`s in `dicts` using the first valid value for each key.
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Normally valid: not None and not an empty string
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Keyword-only args:
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unblank: allow empty string if False (default True)
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rev: merge dicts in reverse order (default False)
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merge_dicts(dct1, dct2, ..., unblank=False, rev=True)
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matches {**dct1, **dct2, ...}
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However, merge_dicts(dct1, dct2, ..., rev=True) may often be better.
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"""
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unblank = kwargs.get('unblank', True)
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rev = kwargs.get('rev', False)
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if unblank:
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def can_merge_str(k, v, to_dict):
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return (isinstance(v, compat_str) and v
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and isinstance(to_dict[k], compat_str)
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and not to_dict[k])
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else:
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can_merge_str = lambda k, v, to_dict: False
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merged = {}
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for a_dict in dicts:
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for a_dict in reversed(dicts) if rev else dicts:
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for k, v in a_dict.items():
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if v is None:
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continue
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if (k not in merged
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or (isinstance(v, compat_str) and v
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and isinstance(merged[k], compat_str)
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and not merged[k])):
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if (k not in merged) or can_merge_str(k, v, merged):
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merged[k] = v
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return merged
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