当我在终端中执行命令<?xml version="1.0"?>
<package>
<job id="default" filename="file_exists.wsf">
<script language="jscript">
<![CDATA[
// <beg-block>
// - caption: demo file existence check in wsh jscript
// rectype: rrmicro004
// dmid: "uu446mussi0driv"
// date: "2019-04-12"
// tags: file,path,exists
// notes: |
// * seealso ;; https://stackoverflow.com/questions/38000929/check-to-see-if-file-exists-and-then-execute-code
// <end-block>
// regionbeg_:uu310host: function.init//
function ost_fileExists(sFileSpec){
var fso = new ActiveXObject("Scripting.FileSystemObject");
var vout;
if (fso.FileExists(sFileSpec)){
vout = true;
}else{
vout = false;
}
//
return(vout);
}
// regionend_:uu310host//
// regionbeg_:: vars.init//
var str_currdir = new ActiveXObject("WScript.Shell").CurrentDirectory.replace(/\\/g, '/');
str_currfile = 'file_exists.wsf';
var mytest;
// regionend_://
// regionbeg_:: vars.populate//
str_fullpath = [str_currdir,'/',str_currfile].join('');
str_fakepath = [str_currdir,'/','fake_noexisto.txt'].join('');
// regionend_://
// regionbeg_:: show result//
mytest = ost_fileExists(str_fullpath);
if(mytest){
WScript.Echo(str_fullpath +' '+"Really exist!!!");
}
mytest = ost_fileExists(str_fakepath);
if(!mytest){
WScript.Echo(str_fakepath +' '+"Does not exist!!!");
}
// regionend_://
]]>
</script>
</job>
</package>
时，控制台将返回以下错误：
pip3 install pip如果我测试Requirement already satisfied: pip in ./Library/Python/3.7/lib/python/site-packages (19.0.1)
No metadata found in ./Library/Python/3.7/lib/python/site-packages
Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: '/Users/me/Library/Python/3.7/lib/python/site-packages/pip-19.0.1.dist-info/METADATA'
，在这种情况下，我有一个很大的障碍：
pip3 install -U pip但是，通过Collecting pip
Using cached https://files.pythonhosted.org/packages/d8/f3/413bab4ff08e1fc4828dfc59996d721917df8e8583ea85385d51125dceff/pip-19.0.3-py2.py3-none-any.whl
Error checking for conflicts.
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2897, in _dep_map
return self.__dep_map
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2691, in __getattr__
raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2888, in _parsed_pkg_info
return self._pkg_info
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2691, in __getattr__
raise AttributeError(attr)
AttributeError: _pkg_info
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 503, in _warn_about_conflicts
package_set, _dep_info = check_install_conflicts(to_install)
File "/usr/local/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 108, in check_install_conflicts
package_set, _ = create_package_set_from_installed()
File "/usr/local/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 47, in create_package_set_from_installed
package_set[name] = PackageDetails(dist.version, dist.requires())
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2635, in requires
dm = self._dep_map
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2899, in _dep_map
self.__dep_map = self._compute_dependencies()
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2908, in _compute_dependencies
for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2890, in _parsed_pkg_info
metadata = self.get_metadata(self.PKG_INFO)
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 1410, in get_metadata
value = self._get(self._fn(self.egg_info, name))
File "/usr/local/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 1522, in _get
with open(path, 'rb') as stream:
FileNotFoundError: [Errno 2] No such file or directory: '/Users/me/Library/Python/3.7/lib/python/site-packages/pip-19.0.1.dist-info/METADATA'
Installing collected packages: pip
Found existing installation: pip 19.0.1
Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: '/Users/me/Library/Python/3.7/lib/python/site-packages/pip-19.0.1.dist-info/RECORD'
给出的版本是19.0.3，但是在pip3 -V命令的输出中pip软件包仍标记为19.0.1。我使用Python 3.7.2，该软件通过Mac（MacOS 10.14.4）上的HomeBrew安装。
此错误很常见，最后一行甚至通过pip出现在每个软件包安装中，因此我不知道我应该修复它还是忽略它。因为我在其他计算机/服务器上没有此错误。...
答案 0 :(得分：0)
我终于找到了解决该问题的方法（感谢GitHub上的pip职员^^），通过完全删除Mac的任何python文件/文件夹，无论它们在哪里（使用find命令，终奌站）。然后，当我确定python不再存在时，我使用brew再次下载了它，现在一切正常。
我希望这会对某些人有同样的问题有所帮助！