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Do not mutate default arguments
In this case, it looks rather harmless (since the conditions for --restrict-filenames should not change while a process is running), but just to be sure. This also simplifies the interface for callers, who can just pass in the idiomatic None for "I don't care, whatever is the default".
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@ -146,7 +146,7 @@ class YoutubeDL(object):
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_num_downloads = None
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_screen_file = None
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def __init__(self, params={}):
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def __init__(self, params=None):
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"""Create a FileDownloader object with the given options."""
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self._ies = []
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self._ies_instances = {}
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@ -155,7 +155,7 @@ def __init__(self, params={}):
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self._download_retcode = 0
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self._num_downloads = 0
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self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)]
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self.params = params
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self.params = {} if params is None else params
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if (sys.version_info >= (3,) and sys.platform != 'win32' and
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sys.getfilesystemencoding() in ['ascii', 'ANSI_X3.4-1968']
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