I am wondering how can I manage input from another command from a python script.
Example:
$ cat myfile.txt | my_python_script.py
How can my script manage the input stream from the cat command ? How Can I get an input from this piped commands ?
... Thanks a lot.
An easy and quite versatile way to accomplish this is to use the fileinput module.
import fileinput
for line in fileinput.input()
# do things with line
This way you can both use the script in a pipeline (as you need to right now) or give one or more files to the script as a parameter (think my_python_script.py input.txt input2.txt).
A good alternative to reading the standard input via sys.stdin.readlines()
: use the pipes module.
The pipes module defines a class to abstract the concept of a pipeline — a sequence of converters from one file to another. Because the module uses /bin/sh command lines, a POSIX or compatible shell for os.system() and os.popen() is required.
Here's a nice tutorial.
