[Tips] 線上去背

有幾套很神奇，但都要收費，如果偶而用一下真不想付錢 QQ

這服務免費而且有教學
http://www.online-image-editor.com/
http://www.online-image-editor.com/help/transparency

[Python] python setup.py install反安裝

沒有 python setup.py uninstall 這麼好的事，需要自己手動將建立出來的檔案幹掉，所以安裝的時候要先紀錄長出什麼檔案

$ python setup.py install --record files.txt

$ cat files.txt | xargs rm -rf

reference:
https://stackoverflow.com/questions/1550226/python-setup-py-uninstall


順便紀錄這個錯誤訊息 python Exception AttributeError: "'Serial' object has no attribute 'is_open'" 是來自於 pyserial 的版本太舊，要安裝 3.0 以上才行

reference:
https://stackoverflow.com/questions/41987168/serial-object-has-no-attribute-is-open

[Ubuntu] 在 Ubuntu16 裝 .NET Framework 4.0

要使用 winetricks

wget 'https://raw.githubusercontent.com/Winetricks/winetricks/master/src/winetricks'

chmod +x winetricks

env WINEARCH=win32 WINEPREFIX=~/.wine32 winetricks dotnet40

reference:
https://appdb.winehq.org/objectManager.php?sClass=version&iId=17886
https://superuser.com/questions/476872/installing-net-4-0-framework-on-wine-using-winetricks

[Tips] wireshark在ubuntu16看不到網路裝置

sudo adduser $USER wireshark 參考這篇的，但還沒重開機和登出，不知道是否有效？ https://self.jxtsai.info/2016/10/wireshark-for-ubuntu.html

[RF] Labs 1 - 5 in GRC

投影片蠻清楚的 https://files.ettus.com/tutorials/

[LoRa]

pip install PyBOMBS sudo apt-get install doxygen fftw-dev liblog4cpp5-dev swig libcppunit-dev libvolk1-dev https://github.com/rpp0/gr-lora

錯誤訊息

PyBOMBS - INFO - PyBOMBS Version 2.3.2
PyBOMBS.Packager.apt - INFO - Install python-apt to speed up apt processing.
PyBOMBS.install_manager - INFO - Phase 1: Creating install tree and installing binary packages:
Traceback (most recent call last):
  File "/usr/local/bin/pybombs", line 9, in 
    load_entry_point('PyBOMBS==2.3.2', 'console_scripts', 'pybombs')()
  File "/usr/local/lib/python2.7/dist-packages/pybombs/main.py", line 32, in main
    return dispatch() or 0
  File "/usr/local/lib/python2.7/dist-packages/pybombs/commands/base.py", line 194, in dispatch
    return get_cmd_dict(cmd_list)[args.command](cmd=args.command, args=args).run()
  File "/usr/local/lib/python2.7/dist-packages/pybombs/commands/install.py", line 122, in run
    static=getattr(self.args, 'static', False),
  File "/usr/local/lib/python2.7/dist-packages/pybombs/install_manager.py", line 112, in install
    lambda pkg: _cached_check_if_pkg_goes_into_tree(pkg, _check_if_pkg_goes_into_tree)
  File "/usr/local/lib/python2.7/dist-packages/pybombs/dep_manager.py", line 53, in make_dep_tree
    pkg_set = set([pkg for pkg in pkg_list if filter_callback(pkg)])
  File "/usr/local/lib/python2.7/dist-packages/pybombs/install_manager.py", line 112, in 
    lambda pkg: _cached_check_if_pkg_goes_into_tree(pkg, _check_if_pkg_goes_into_tree)
  File "/usr/local/lib/python2.7/dist-packages/pybombs/install_manager.py", line 97, in _cached_check_if_pkg_goes_into_tree
    ret_val = check_callback(pkg)
  File "/usr/local/lib/python2.7/dist-packages/pybombs/install_manager.py", line 63, in _check_if_pkg_goes_into_tree
    if not self.pm.exists(pkg):
  File "/usr/local/lib/python2.7/dist-packages/pybombs/package_manager.py", line 134, in exists
    pkg_version = pkgr.exists(r)
AttributeError: 'NoneType' object has no attribute 'exists'

sudo ldconfig

就可以解決

* https://github.com/rpp0/gr-lora/issues/42
wiki一定要看
* https://github.com/rpp0/gr-lora/wiki/Capturing-LoRa-signals-using-an-RTL-SDR-device
* https://github.com/rpp0/gr-lora/issues/7
* https://github.com/rpp0/gr-lora/issues/34

[Python] Python Strings in 3.0: Unicode and Binary Data

http://learning-python.com/strings30.html