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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"subprocess.Popen with universal_newlines and nonblocking streams fails with \"can't concat NoneType to bytes\"","articleBody":"BPO | [35762](https://bugs.python.org/issue35762)\n--- | :---\nNosy | @vstinner, @vadmium\nSuperseder | \u003cli\u003ebpo-13322: The io module doesn\u0026#x27;t support non-blocking files\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2019-10-10.08:26:26.725\u003e\ncreated_at = \u003cDate 2019-01-17.15:22:48.357\u003e\nlabels = ['type-bug', '3.7', 'expert-IO']\ntitle = 'subprocess.Popen with universal_newlines and nonblocking streams fails with \"can\\'t concat NoneType to bytes\"'\nupdated_at = \u003cDate 2019-10-10.08:26:26.724\u003e\nuser = 'https://bugs.python.org/sambayer'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2019-10-10.08:26:26.724\u003e\nactor = 'vstinner'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2019-10-10.08:26:26.725\u003e\ncloser = 'vstinner'\ncomponents = ['IO']\ncreation = \u003cDate 2019-01-17.15:22:48.357\u003e\ncreator = 'sambayer'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 35762\nkeywords = []\nmessage_count = 3.0\nmessages = ['333883', '334045', '354336']\nnosy_count = 3.0\nnosy_names = ['sambayer', 'vstinner', 'martin.panter']\npr_nums = []\npriority = 'normal'\nresolution = 'duplicate'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = '13322'\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue35762'\nversions = ['Python 3.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/sambayer","@type":"Person","name":"sambayer"},"datePublished":"2019-01-17T15:22:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/79943/cpython/issues/79943"}