1、背景

windows10 操作系统；
gunicorn：20.1.0

在安装gunicorn之后，导入from gunicorn.app.wsgiapp import run报错。

pip 安装 gunicorn，如下：

C:\Users\Administrator>pip install gunicorn
Collecting gunicorn
  Downloading gunicorn-20.1.0-py3-none-any.whl (79 kB)
     ---------------------------------------- 79.5/79.5 kB 1.5 MB/s eta 0:00:00
Requirement already satisfied: setuptools>=3.0 in e:\e01_pykaifa\e01_01_python3\install_python3.8.8\lib\site-packages (from gunicorn) (49.2.1)
Installing collected packages: gunicorn
Successfully installed gunicorn-20.1.0

C:\Users\Administrator>
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导入from gunicorn.app.wsgiapp import run报错，如下：

C:\Users\Administrator>python
Python 3.8.8 (tags/v3.8.8:024d805, Feb 19 2021, 13:18:16) [MSC v.1928 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from gunicorn.app.wsgiapp import run
Traceback (most recent call last):
  File "", line 1, in <module>
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\app\wsgiapp.py", line 9, in <module>
    from gunicorn.app.base import Application
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\app\base.py", line 11, in <module>
    from gunicorn import util
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\util.py", line 8, in <module>
    import fcntl
ModuleNotFoundError: No module named 'fcntl'
>>>
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2、解决办法

解决办法：在python路径下的Lib中新建一个fcntl.py文件内容如下：

# fcntl.py

LOCK_UN=8
F_GETFD=1
FD_CLOEXEC=1
F_SETFD=2

def fcntl(fd, op, arg=0):
    return 0

def ioctl(fd, op, arg=0, mutable_flag=True):
    if mutable_flag:
        return 0
    else:
        return ""

def flock(fd, op):
    return

def lockf(fd, operation, length=0, start=0, whence=0):
    return
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博主python安装目录：

E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8
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3、关于Gunicorn

这只解决了No module named ‘fcntl’，再次运行又会报新的错误：

C:\Users\Administrator>python
Python 3.8.8 (tags/v3.8.8:024d805, Feb 19 2021, 13:18:16) [MSC v.1928 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from gunicorn.app.wsgiapp import run
Traceback (most recent call last):
  File "", line 1, in <module>
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\app\wsgiapp.py", line 9, in <module>
    from gunicorn.app.base import Application
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\app\base.py", line 11, in <module>
    from gunicorn import util
  File "E:\E01_PyKaiFa\E01_01_Python3\install_python3.8.8\lib\site-packages\gunicorn\util.py", line 15, in <module>
    import pwd
ModuleNotFoundError: No module named 'pwd'
>>>
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为什么呢？
因为目前为止，Gunicorn还不能在Windows上运行。

但是已经有Windows支持的计划了，相信未来能很好的支持到Windows系统。
现在计划添加Windows支持。https://github.com/benoitc/gunicorn/issues/524

Gunicorn官网：
https://docs.gunicorn.org/en/stable/index.html