wiki:v2:building_libpixyusb_as_a_python_module_on_linux
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wiki:v2:building_libpixyusb_as_a_python_module_on_linux [2018/07/24 07:18] hohenheim [Using the Python API on Linux] |
wiki:v2:building_libpixyusb_as_a_python_module_on_linux [2019/08/08 18:51] pixycam [Python2 vs Python3] |
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| Start a terminal application. In the terminal window type: | Start a terminal application. In the terminal window type: | ||
| - | ''%%# sudo apt-get install swig libusb-1.0-0-dev g++ git%%'' | + | ''%%# sudo apt-get install swig libusb-1.0-0-dev g++ git build-essential%%'' |
| ===== 2.2. Download Pixy2 source code ===== | ===== 2.2. Download Pixy2 source code ===== | ||
| Line 22: | Line 22: | ||
| In the terminal window type: | In the terminal window type: | ||
| - | ''%%# git clone https://github.com/charmedlabs/pixy2 %%'' | + | ''%%# git clone https://github.com/charmedlabs/pixy2.git %%'' |
| ===== 2.3. Build the Pixy2 SWIG module ===== | ===== 2.3. Build the Pixy2 SWIG module ===== | ||
| Line 32: | Line 32: | ||
| ===== 2.4. Try it out! ===== | ===== 2.4. Try it out! ===== | ||
| + | |||
| + | Change directory to the build folder. In your terminal window type: | ||
| + | |||
| + | ''%%# cd ../build/python_demos%%'' | ||
| ==== 2.4.1. Run the get blocks demo ==== | ==== 2.4.1. Run the get blocks demo ==== | ||
| Make sure your Pixy2 is connected to a USB port on your computer. Then in a terminal window type: | Make sure your Pixy2 is connected to a USB port on your computer. Then in a terminal window type: | ||
| - | ''%%# cd ../build/python_demos%%''\\ | ||
| ''%%# python get_blocks_python_demo.py%%'' | ''%%# python get_blocks_python_demo.py%%'' | ||
| Line 53: | Line 56: | ||
| If you don't see any block information, try running as superuser: | If you don't see any block information, try running as superuser: | ||
| - | ''%%sudo python get_blocks_python_demo.py%%'' | + | ''%%# sudo python get_blocks_python_demo.py%%'' |
| ==== 2.4.2. Run the get lines demo ==== | ==== 2.4.2. Run the get lines demo ==== | ||
| Make sure your Pixy2 is connected to a USB port on your computer. Then in a terminal window type: | Make sure your Pixy2 is connected to a USB port on your computer. Then in a terminal window type: | ||
| - | ''%%# cd ../build/python_demos%%''\\ | ||
| ''%%# python get_lines_python_demo.py%%'' | ''%%# python get_lines_python_demo.py%%'' | ||
| Line 72: | Line 74: | ||
| ''%%[VECTOR: INDEX=0 X0= 55 Y0= 27 X1= 51 Y1= 2]%%''\\ | ''%%[VECTOR: INDEX=0 X0= 55 Y0= 27 X1= 51 Y1= 2]%%''\\ | ||
| ''%%frame 3:%%''\\ | ''%%frame 3:%%''\\ | ||
| - | ''%%[VECTOR: INDEX=1 X0= 57 Y0= 31 X1= 53 Y1= 21]%%''\\ | + | ''%%[VECTOR: INDEX=1 X0= 57 Y0= 31 X1= 53 Y1= 21]%%'' |
| + | |||
| + | If you don't see any line feature information, try running as superuser: | ||
| + | |||
| + | ''%%# sudo python get_lines_python_demo.py%%'' | ||
| + | |||
| + | ====== Errors ====== | ||
| + | |||
| + | If you are getting an error like: | ||
| + | |||
| + | ''ImportError: No module named _pixy'' | ||
| + | |||
| + | Python is having trouble finding the Pixy Python library. This may be because you are running in another directory. Just copy over the \_pixy.so and pixy.py files in the ''pixy2/build/python_demos'' directory to your directory and it should work. | ||
| + | |||
| + | If you still get an error, you may be running into a Python version issue. Please see the next section. | ||
| + | |||
| + | |||
| + | ====== Python2 vs Python3 ====== | ||
| + | |||
| + | This library will support both Python2 and Python3, but sometimes it will compile fine but provide import errors when you try to run one of the Python demos. | ||
| + | |||
| + | |||
| + | If you want Python3 support, for example, make sure that your default "python" is Python3 before running ''build_python_demos.sh''. That is, make sure that Python3 is the version of Python that runs when you type in the "python" command in your shell. You can test this by running "python --version" at the shell prompt. | ||
| + | |||
| + | If it's not version 3 (or higher), change the default version to be Python3. The recommended way to do this may depend on your Linux distribution. | ||
wiki/v2/building_libpixyusb_as_a_python_module_on_linux.txt · Last modified: 2019/08/08 21:12 by pixycam
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