JPype, py4j and PyJNIus are all good options for Java interface for Python. Jpype is easy to use and widely adopted. PyJNIus is an even easier solution compred to JPype. py4j is more complicated to use compared to JPype and PyJNIus, however, it has a better performance, generally speaking.

JPype …

The GIL is controversial because it prevents multithreaded CPython programs from taking full advantage of multiprocessor systems in certain situations. Note that potentially blocking or long-running operations, such as I/O, image processing, and NumPy number crunching, happen outside the GIL. Therefore it is only in multithreaded programs that spend …

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1. Call the package outside it

2. Add .. into sys.path.

   :::python import sys sys.path.append("..")

References

beyond top level package error in relative import

How to do relative imports in Python …

__file__ is the path of the Python script. Note that if you make a sybolic link to a Python script and run the symbolic link, then __file__ is the path of the symbolic link. Of course, you can use os.path.realpath to get real path of files.

pathlib.Path …

Python pandas

My first choice is pandas in Python. However, below are some tools for quick and dirty solutions.

q

q -t -H 'select c1, c3 from file.txt'

cut

cut -d\t -f1,3 file.txt

awk

awk -F'\t' '{print $1 "\t" $3}' file.tsv 

Note: neither cut …

Linux

1. Get information of the staff group.

   $ getent group staff
   staff:x:20:
   

2. Get group ID of the staff group.

   $ getent group staff | cut -d: -f3
   20
   

Mac

1. Get information of the staff group.

   $ dscl . -read /Groups/staff
   

2. Get group ID of the staff group.

   $ dscl . -read /Groups/staff | awk …