__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 …

If there is only 1 class with a main method or if there is a Main-Class defined for the JAR, you can use the following command to run the application.

java -jar app.jar

If you there are multiple classes with main methods in the JAR, you can execute any …

I encountered an input/output bug in R in Linux system. The symptom is that input and output are not displayed in the terminal and the warning message "An unusual circumstance has arisen in the nesting of readline input. Please report using bug.report()" is shown. I found that though …

Mathematica is a very intelligent and powerful math software. I use it in my study and research a lot. Mathematica's ability to take derivative and to calculate limit is obvious powerful–way much beyond many mathematician's ability. Mathematica's ability to calculate integral is also powerful. There are many integrals than …