json provides four functions:
- dumps : convert json data to string
json.dumps(obj,skipkeys=False,separators=None,sort_keys=False) - loads loads strings as json data
json.loads(s) - dump : serialize json data to file
json.dump(obj, fp, sort_keys=False,) - load : Loading json data from a file
json.load(fp)
omits many formal parameters. For more details, see the official json documentation
pickle also provides four similar functions:
- pickle.dump(obj, file, protocol=None, *, fix_imports=True)
- pickle.dumps(obj, protocol=None, *, fix_imports=True)
- pickle.load(file, *, fix_imports=True, encoding=”ASCII”, errors=”strict”)
pickle.loads(bytes_object, *, fix_imports=True, encoding=”ASCII”, errors=”strict”)
For more details, see the official documentation of pickle
. The difference is that json implements the conversion between json data and strings, while pickle implements the conversion between json data and byte objects.The following figure shows an example of pickle:
Another important difference between json and pickle is that json can only serialize the basic data types of python : Number (number) String (string) List (list) Tuple (tuple) Sets (collection) Dictionary (dictionary), but cannot serialize classes, objects, etc.; and pickle can serialize everything , including classes, objects, functions, and so on.
