From the documentation for the standard library json module:
json.dump(obj, fp, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)Serialize obj as a JSON formatted stream to fp (a
.write()-supporting file-like object) using this conversion table.
What exactly does this description mean? What object types are “.write()-supporting”, and “file-like”?
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Answer
File-like objects are mainly StringIO objects, connected sockets and, well, actual file objects.
If everything goes well, urllib.urlopen() returns a file-like object supporting the necessary methods.