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I use a class to write easily json when having generator.
```python
class StreamArray(list):
 def __init__(self, generator):
 super().__init__()
 self.generator = generator
 def __iter__(self):
 return self.generator
 def __len__(self):
 return 1
```
Below a test comparing json.dump and json.dumps.
```
>>> import json
>>> class StreamArray(list):
... def __init__(self, generator):
... super().__init__()
... self.generator = generator
... def __iter__(self):
... return self.generator
... def __len__(self):
... return 1
... 
>>> g = (i for i in range(0))
>>> json.dumps({"a": StreamArray(g)})
'{"a": []}'
>>> f = open("/tmp/test.json", "w+")
>>> g = (i for i in range(0))
>>> json.dump({"a": StreamArray(g)}, f)
>>> f.close()
>>> print(open("/tmp/test.json").read())
{"a": ]}
```
I don't know if it's me or if there is actually a problem, could you help me ?