我刚刚下载了vPython for Python 2.7.9,并在导入.visual库时得到了以下错误: File "Untitled", line 1 File "C:\Python27\Lib\site-packages\visual\__init__.py", linevisual_common.cvisual import vector
ImportError: num
终端在安装过程中表示存在这样的问题:Error: The following formulacannot be installed as binary package and must be built from source.Install the Command Line Tools:
xcode-select --ins