嘗試使用Python 3運行Flask時出現“ ImportError：沒有名為SocketServer的模塊”

Question

Flask已與pip3 install flask 。 我的代碼如下：

import flask
app = flask.Flask(__name__)

@app.route('/')
def hello():
    return "Hello World"

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)

當我將此代碼作為Python 2運行時，它會產生通常的輸出並正確響應請求。 在Python 3下運行時，它不會產生任何輸出，並且所有嘗試連接到localhost：8080或127.0.0.1:8080的嘗試都將被拒絕。

當我殺死服務器時，它會顯示以下消息：

Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/werkzeug/serving.py", line 58, in <module>
    from SocketServer import ThreadingMixIn, ForkingMixIn
ImportError: No module named 'SocketServer'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "testflask.py", line 9, in <module>
    app.run(host='0.0.0.0', port=8080)
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 758, in run
    from werkzeug.serving import run_simple
  File "/usr/local/lib/python3.4/dist-packages/werkzeug/serving.py", line 61, in <module>
    from socketserver import ThreadingMixIn, ForkingMixIn
  File "/home/samtheman/code/lasreader/rclick/socketserver.py", line 25, in <module>
    MyServer(s.accept()).start()
  File "/usr/lib/python3.4/socket.py", line 184, in accept
    fd, addr = self._accept()
KeyboardInterrupt

$ pip3 show flask werkzeug
---
Name: Flask
Version: 0.10.1
Location: /usr/local/lib/python3.4/dist-packages
Requires: Werkzeug, Jinja2, itsdangerous
---
Name: Werkzeug
Version: 0.10.4
Location: /usr/local/lib/python3.4/dist-packages
Requires: 

$ pip show flask werkzeug
---
Name: Flask
Version: 0.10.1
Location: /usr/local/lib/python2.7/dist-packages
Requires: Werkzeug, Jinja2, itsdangerous
---
Name: Werkzeug
Version: 0.9.6
Location: /usr/local/lib/python2.7/dist-packages
Requires: 

Answer 1

您的回溯表明導入了錯誤的模塊 ：

  File "/usr/local/lib/python3.4/dist-packages/werkzeug/serving.py", line 61, in <module>
    from socketserver import ThreadingMixIn, ForkingMixIn
  File "/home/samtheman/code/lasreader/rclick/socketserver.py", line 25, in <module>
    MyServer(s.accept()).start()

看到第二條File行嗎？ 那不是標准庫socketserver ， socketserver完全不同的模塊。 作為該模塊的一部分，它將在import上啟動套接字服務器，因此Werkzeug導入永遠不會完成，也永遠無法正常運行。

從python路徑中刪除/home/samtheman/code/lasreader/rclick或完全刪除該模塊。