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我試圖將一些數據從Google Cloud SQL數據庫導出到Excel文件，使用Python xlsxwriter，webapp2，appengine在延期任務中。UnicodeDecodeError while cursor.fetchall（）
要寫入的數據必須從數據庫中檢索。
執行查詢時正常，但當我嘗試從查詢獲取數據或者使用cursor.fetchall（）或通過遍歷光標它是扔以下錯誤：
UnicodeDecodeError錯誤： 'UTF8' 編解碼器不能在4位進行解碼字節0x9f：無效起始字節
的堆棧跟蹤是：
for row in cursor:
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 689, in fetchone
self._FetchMoreRows()
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 606, in _FetchMoreRows
self._DoExec(request)
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 448, in _DoExec
return self._HandleResult(response.result)
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 487, in _HandleResult
new_rows = self._GetRows(result)
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 532, in _GetRows
tuple_proto.values[value_index]))
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/rdbms.py", line 402, in _DecodeVariable
return converter(value)
File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/storage/speckle/python/api/converters.py", line 126, in Str2Unicode
return unicode(arg, 'utf-8')
UnicodeDecodeError: 'utf8' codec can't decode byte 0x9f in position 4: invalid start byte
如果我嘗試使用MySQLdb而不是rdbms在本地運行它，則相同的代碼有效。
數據中可能存在一些編碼問題，但在寫入文件時會出現這種問題。
我試圖找到一些可能已損壞但無法找到的數據。