prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  AU battery returning type error
  ```
  fetch_production("AUS-SA") ->
  Traceback (most recent call last):
    File "AU.py", line 558, in <module>
      print(fetch_production('AUS-SA'))
    File "AU.py", line 422, in fetch_production
      data['storage']['battery'] = AU_battery.fetch_SA_battery()
    File "/home/chris/electricitymap/parsers/lib/AU_battery.py", line 30, in fetch_SA_battery
      latest = json.loads(data[-1])
    File "/usr/lib/python3.5/json/__init__.py", line 312, in loads
      s.__class__.__name__))
  TypeError: the JSON object must be str, not 'bytes'
  ```
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `parsers/lib/AU_battery.py`
  Content:
  ```
  1 #!/usr/bin/env python3
  2 
  3 """Parser for South Australia's 129MWh battery built by Tesla."""
  4 import arrow
  5 import json
  6 import requests
  7 
  8 # nemlog_url gets generation status in 5 min intervals.
  9 
  10 
  11 def fetch_SA_battery(session=None):
  12     """
  13     Makes a request to the nemlog api for South Australia battery data.
  14     Returns a float or None.
  15     """
  16 
  17     today = arrow.now('Australia/Adelaide')
  18     current = today.format('YYYYMMDD')
  19     old = today.shift(days=-2).format('YYYYMMDD')
  20     nemlog_url = 'http://nemlog.com.au/api/unit/HPRL1/{}/{}/json'.format(old, current)
  21 
  22     s = session or requests.Session()
  23     req = s.get(nemlog_url)
  24 
  25     data = []
  26     for line in req.iter_lines():
  27         data.append(line)
  28 
  29     try:
  30         latest = json.loads(data[-1])
  31     except IndexError:
  32         # No data available.
  33         return None
  34 
  35     state = float(latest["SCADAVALUE"])
  36 
  37     # Source classifies charge/discharge opposite to EM.
  38     battery_status = -1 * state
  39 
  40     return battery_status
  41 
  42 
  43 if __name__ == '__main__':
  44     print('fetch_SA_battery() ->')
  45     print(fetch_SA_battery())
  46
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/parsers/lib/AU_battery.py b/parsers/lib/AU_battery.py
  --- a/parsers/lib/AU_battery.py
  +++ b/parsers/lib/AU_battery.py
  @@ -21,11 +21,9 @@
   
       s = session or requests.Session()
       req = s.get(nemlog_url)
  -
       data = []
  -    for line in req.iter_lines():
  +    for line in req.iter_lines(decode_unicode=True):
           data.append(line)
  -
       try:
           latest = json.loads(data[-1])
       except IndexError:
  
verification_info: {"golden_diff": "diff --git a/parsers/lib/AU_battery.py b/parsers/lib/AU_battery.py\n--- a/parsers/lib/AU_battery.py\n+++ b/parsers/lib/AU_battery.py\n@@ -21,11 +21,9 @@\n \n     s = session or requests.Session()\n     req = s.get(nemlog_url)\n-\n     data = []\n-    for line in req.iter_lines():\n+    for line in req.iter_lines(decode_unicode=True):\n         data.append(line)\n-\n     try:\n         latest = json.loads(data[-1])\n     except IndexError:\n", "issue": "AU battery returning type error\n```\r\nfetch_production(\"AUS-SA\") ->\r\nTraceback (most recent call last):\r\n  File \"AU.py\", line 558, in <module>\r\n    print(fetch_production('AUS-SA'))\r\n  File \"AU.py\", line 422, in fetch_production\r\n    data['storage']['battery'] = AU_battery.fetch_SA_battery()\r\n  File \"/home/chris/electricitymap/parsers/lib/AU_battery.py\", line 30, in fetch_SA_battery\r\n    latest = json.loads(data[-1])\r\n  File \"/usr/lib/python3.5/json/__init__.py\", line 312, in loads\r\n    s.__class__.__name__))\r\nTypeError: the JSON object must be str, not 'bytes'\r\n```\n", "before_files": [{"content": "#!/usr/bin/env python3\n\n\"\"\"Parser for South Australia's 129MWh battery built by Tesla.\"\"\"\nimport arrow\nimport json\nimport requests\n\n# nemlog_url gets generation status in 5 min intervals.\n\n\ndef fetch_SA_battery(session=None):\n    \"\"\"\n    Makes a request to the nemlog api for South Australia battery data.\n    Returns a float or None.\n    \"\"\"\n\n    today = arrow.now('Australia/Adelaide')\n    current = today.format('YYYYMMDD')\n    old = today.shift(days=-2).format('YYYYMMDD')\n    nemlog_url = 'http://nemlog.com.au/api/unit/HPRL1/{}/{}/json'.format(old, current)\n\n    s = session or requests.Session()\n    req = s.get(nemlog_url)\n\n    data = []\n    for line in req.iter_lines():\n        data.append(line)\n\n    try:\n        latest = json.loads(data[-1])\n    except IndexError:\n        # No data available.\n        return None\n\n    state = float(latest[\"SCADAVALUE\"])\n\n    # Source classifies charge/discharge opposite to EM.\n    battery_status = -1 * state\n\n    return battery_status\n\n\nif __name__ == '__main__':\n    print('fetch_SA_battery() ->')\n    print(fetch_SA_battery())\n", "path": "parsers/lib/AU_battery.py"}], "after_files": [{"content": "#!/usr/bin/env python3\n\n\"\"\"Parser for South Australia's 129MWh battery built by Tesla.\"\"\"\nimport arrow\nimport json\nimport requests\n\n# nemlog_url gets generation status in 5 min intervals.\n\n\ndef fetch_SA_battery(session=None):\n    \"\"\"\n    Makes a request to the nemlog api for South Australia battery data.\n    Returns a float or None.\n    \"\"\"\n\n    today = arrow.now('Australia/Adelaide')\n    current = today.format('YYYYMMDD')\n    old = today.shift(days=-2).format('YYYYMMDD')\n    nemlog_url = 'http://nemlog.com.au/api/unit/HPRL1/{}/{}/json'.format(old, current)\n\n    s = session or requests.Session()\n    req = s.get(nemlog_url)\n    data = []\n    for line in req.iter_lines(decode_unicode=True):\n        data.append(line)\n    try:\n        latest = json.loads(data[-1])\n    except IndexError:\n        # No data available.\n        return None\n\n    state = float(latest[\"SCADAVALUE\"])\n\n    # Source classifies charge/discharge opposite to EM.\n    battery_status = -1 * state\n\n    return battery_status\n\n\nif __name__ == '__main__':\n    print('fetch_SA_battery() ->')\n    print(fetch_SA_battery())\n", "path": "parsers/lib/AU_battery.py"}]}