If your card10 display shows the text _USB activated._ your card10 is in the _USB storage_ mode, which is the wrong mode for the interactive python command line. If the device is mounted you need to eject it first. A brief press on the _power_ button will exit the _USB storage_ mode.
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To get to the interactive command line, connect your card10 to your laptop. Typically, it will be called `/dev/ttyACM0` or `/dev/ttyACM1`.
You can find out what it is called on your machine by comparing the output of `ls /dev/tty*` before and after you connect your card10 to the laptop.
To get to the interactive command line, connect your card10 to your laptop. Typically, it will be called `/dev/ttyACM0` or `/dev/ttyACM1`, on Mac OS X likely `/dev/tty.usbmodem14101`.
You can find out what it is called on your machine by comparing the output of `ls /dev/tty*`(or `ls /dev/tty.*` on Mac OS X) before and after you connect your card10 to the laptop.
Depending on which tool you chose, you can open the interactive python command line. You might need to add "sudo" in front of the commands.
