René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] Response Error Occurs from Python API SPARQL Query ","articleBody":"**Describe the bug**\r\nThe response error occurs from time to time when I queried with python api.\r\n\r\n**To Reproduce**\r\nSteps to reproduce the behavior:\r\n1. Go to Colab Notebook\r\n2. Run:\r\n```python\r\nimport datacommons as dc\r\nroot = 'https://api.datacommons.org'\r\nquery_str = '''\r\nSELECT ?name ?pes_score\r\nWHERE { \r\n    ?a typeOf HumanProteinOccurrence . \r\n    ?a proteinExpressionScore ?proteinExpressionScore .\r\n    ?a name ?name .\r\n    ?proteinExpressionScore name ?pes_score}LIMIT 2\r\n'''\r\nresult = dc.query(query_str)\r\n```\r\n3. See response error in the screenshot sometimes\r\n\r\n**Expected behavior**\r\nIt should return the query result as follows:\r\n[{'?name': '4EBP3_HUMAN_Kidney_CellsInTubules',\r\n  '?pes_score': 'ProteinExpressionMedium'},\r\n {'?name': '4ET_HUMAN_Breast_Adipocytes',\r\n  '?pes_score': 'ProteinExpressionMedium'}]\r\n\r\n**Screenshots**\r\nhttps://screenshot.googleplex.com/4d9f7313-5432-42d5-a07f-b478e8f134ab\r\n\r\n","author":{"url":"https://github.com/mengzhensun","@type":"Person","name":"mengzhensun"},"datePublished":"2020-08-18T21:46:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/140/api-python/issues/140"}