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[utils] Add try_get 

To reduce boilerplate when accessing JSON
This commit is contained in:
Sergey M․ 2016-06-12 06:05:34 +07:00
parent 2c3322e36e
commit 329ca3bef6
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1 changed files with 10 additions and 0 deletions
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10
youtube_dl/utils.py
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@ -1901,6 +1901,16 @@ def dict_get(d, key_or_keys, default=None, skip_false_values=True):
return d.get(key_or_keys, default) return d.get(key_or_keys, default)
def try_get(src, getter, expected_type=None):
try:
v = getter(src)
except (AttributeError, KeyError, TypeError, IndexError):
pass
else:
if expected_type is None or isinstance(v, expected_type):
return v
def encode_compat_str(string, encoding=preferredencoding(), errors='strict'): def encode_compat_str(string, encoding=preferredencoding(), errors='strict'):
return string if isinstance(string, compat_str) else compat_str(string, encoding, errors) return string if isinstance(string, compat_str) else compat_str(string, encoding, errors)