Python3.7版本关于导入gevent库时报错找不到greenlet问题总结

导入import gevent时报错，提示找不到greenlet模块，在没有找到合适的解决方法时，我卸载重装了gevent库。

C:\Users\MACHENIKE>pip3.7 uninstall gevent
Uninstalling gevent-1.2.2:
Would remove:
g:\helloworld\python\python3.7.7\lib\site-packages\gevent
g:\helloworld\python\python3.7.7\lib\site-packages\gevent-1.2.2-py3.6.egg-info
Proceed (y/n)? y
Successfully uninstalled gevent-1.2.2

　卸载了gevent库之后，重装gevent库时失败，报错：

ERROR: Cannot uninstall 'greenlet'. It is a distutils installed project and thus we cannot accuratel

pip3.7 install gevent
Collecting gevent
  Downloading https://files.pythonhosted.org/packages/e8/78/3852afe86b6406e5a6bdc3bc0cf35fe282eae496ce59b9cf8706f896fc22/gevent-20.9.0-cp37-cp37m-win_amd64.whl (1.5MB)
     |████████████████████████████████| 1.5MB 63kB/s
Requirement already satisfied: cffi>=1.12.2; platform_python_implementation == "CPython" and sys_platform == "win32" in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (1.14.4)
Requirement already satisfied: zope.event in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (4.5.0)
Collecting zope.interface (from gevent)
  Downloading https://files.pythonhosted.org/packages/e6/a1/15072b271df268d142cd4377f750836e3e76dfcf9de16107132c84b2f370/zope.interface-5.2.0-cp37-cp37m-win_amd64.whl (196kB)
     |████████████████████████████████| 204kB 91kB/s
Requirement already satisfied: setuptools in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (41.2.0)
Collecting greenlet>=0.4.17; platform_python_implementation == "CPython" (from gevent)
  Downloading https://files.pythonhosted.org/packages/e4/ca/b15607286f4c2592200eb45b4779f22d4673d7575d2b285da00b86fac99c/greenlet-0.4.17-cp37-cp37m-win_amd64.whl
Requirement already satisfied: pycparser in g:\helloworld\python\python3.7.7\lib\site-packages (from cffi>=1.12.2; platform_python_implementation == "CPython" and sys_platform == "win32"->gevent) (2.18)
Installing collected packages: zope.interface, greenlet, gevent
  Found existing installation: greenlet 0.4.12
ERROR: Cannot uninstall 'greenlet'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

 

解决方法是输入pip  install --ignore-installed greenlet命令，忽略软件包是否已经安装，覆盖已安装的文件。

pip  install --ignore-installed greenlet
Collecting greenlet
  Using cached https://files.pythonhosted.org/packages/e4/ca/b15607286f4c2592200eb45b4779f22d4673d7575d2b285da00b86fac99c/greenlet-0.4.17-cp37-cp37m-win_amd64.whl
Installing collected packages: greenlet
Successfully installed greenlet-0.4.17　

再次安装gevent库，成功。

pip3.7 install gevent
Collecting gevent
  Using cached https://files.pythonhosted.org/packages/e8/78/3852afe86b6406e5a6bdc3bc0cf35fe282eae496ce59b9cf8706f896fc22/gevent-20.9.0-cp37-cp37m-win_amd64.whl
Requirement already satisfied: greenlet>=0.4.17; platform_python_implementation == "CPython" in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (0.4.17)
Requirement already satisfied: setuptools in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (41.2.0)
Requirement already satisfied: zope.interface in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (5.2.0)
Requirement already satisfied: zope.event in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (4.5.0)
Requirement already satisfied: cffi>=1.12.2; platform_python_implementation == "CPython" and sys_platform == "win32" in g:\helloworld\python\python3.7.7\lib\site-packages (from gevent) (1.14.4)
Requirement already satisfied: pycparser in g:\helloworld\python\python3.7.7\lib\site-packages (from cffi>=1.12.2; platform_python_implementation == "CPython" and sys_platform == "win32"->gevent) (2.18)
Installing collected packages: gevent
Successfully installed gevent-20.9.0

 

测试代码

import time
import gevent

def calc_time(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        result = func(*args, **kwargs)
        end_time = time.time()
        print(f"执行时间是{end_time - start_time}")
        return result

    return wrapper

def work1():
    for i in range(5):
        print(f"听音乐...{i}")
        gevent.sleep(1)

def work2():
    for i in range(5):
        gevent.sleep(1)
        print(f"打游戏...{i}")

@calc_time
def main():
    g1 = gevent.spawn(work1) 
    g2 = gevent.spawn(work2) 
    g1.join()
    g2.join()


if __name__ == '__main__':
    main()

听音乐...0
听音乐...1
打游戏...0
听音乐...2
打游戏...1
听音乐...3
打游戏...2
听音乐...4
打游戏...3
打游戏...4
执行时间是5.031771421432495