您应该能够修改 os.environ.

由于 os.pathsep 是分隔不同路径的字符，因此您应该使用它来附加每个新路径:

Since os.pathsep is the character to separate different paths, you should use this to append each new path:

os.environ["PATH"] += os.pathsep + path

或者，如果有多个路径要添加到列表中:

or, if there are several paths to add in a list:

os.environ["PATH"] += os.pathsep + os.pathsep.join(pathlist)

正如您提到的，os.path.join 也可用于您必须附加的每个单独路径，以防您必须从单独的部分构建它们.

As you mentioned, os.path.join can also be used for each individual path you have to append in the case you have to construct them from separate parts.