Mastering Python Scripting for System Administrators

Input by redirection

stdin and stdout are objects created by the os module. We're going to write a script in which we will use stdin and stdout.

Create a script called redirection.py and write the following code in it:

import sysclass Redirection(object):    def __init__(self, in_obj, out_obj):        self.input = in_obj        self.output = out_obj    def read_line(self):        res = self.input.readline()        self.output.write(res)        return res if __name__ == '__main__':    if not sys.stdin.isatty():        sys.stdin = Redirection(in_obj=sys.stdin, out_obj=sys.stdout)            a = input('Enter a string: ')    b = input('Enter another string: ')    print ('Entered strings are: ', repr(a), 'and', repr(b)) 

Run the preceding program as follows:

$ python3 redirection.py

We will receive the following ...