python numpy tricks

gistfile1.txt

list of numpy arrays to a single numpy array
  numpy_array = np.array(np.concatenate(tuple(list)))
  
force image resize to specific size
  convert '*.jpg[200x100!]' resized%03d.png

serve html files (with css) accessible through SVN:
  svn propset svn:mime-type text/css doc/build/html/_static/*.css
  
OpenCV convention:
  frame[height, width]
  
convert image formats (all files inside folder)
  mogrify -format jpg *.bmp
  
rename all files to sequential number order
  ls | cat -n | while read n f; do mv "$f" `printf "plank_%06d.jpg" $n`; done
  OR to rename starting from a given number: i=2501; for file in *.jpg; do mv "$file" $(printf "other_%06d.jpg" "$i"); i=$((i + 1)); done
  
move random number of files to another folder
  shuf -n 50 -e source/* | xargs -i mv {} dest/
  
Combine 3 separate numpy arrays to an RGB image in Python 
   rgb = np.dstack((r,g,b))  # stacks 3 h x w arrays -> h x w x 3
   
Rename all file's extension (from m4b to m4a):
   rename 's/.m4b$/.m4a/' *.m4b 
   
check subfolders size:
   du -shc <foldername>

check overall size of folders on computer:
   df --total -hl
   
save docker image without keeping history
    docker export [containerID] -o containername.tar
    docker import -m "commit message here" containername.tar imagename:tag
    
error when running pip install ('libmagic not found')
    apt-get install libmagic-dev
    
problems 'ImportError: libgthread-2.0.so.0: cannot open shared object file: No such file or directory'
    apt-get install libgtk2.0-dev
    
commit git svn only some modified files
    http://juststuffreally.blogspot.com/2008/10/how-to-git-svn-dcommit-with-local.html
    
install pip stuff on windows
    first do pip download 'package' to see all dependencies, then download the ones that are being blocked, then do:
    for %v in (*.whl) do pip install %v 
    This will install all dependencies, then you can go back to the usual pip install 'package' and it should be installed normally