editor.py 文件源码

def get_editor():
    # Get the editor from the environment.  Prefer VISUAL to EDITOR
    editor = os.environ.get('VISUAL') or os.environ.get('EDITOR')
    if editor:
        return editor

    # None found in the environment.  Fallback to platform-specific defaults.
    for ed in get_default_editors():
        path = find_executable(ed)
        if path is not None:
            return path

    raise EditorError("Unable to find a viable editor on this system."
        "Please consider setting your %s variable" % get_platform_editor_var())