read password from stdin

stdin-check.py

# You can check to see if someone ran your script with `echo -n test | myscript.py`.
# In that case, there's no tty attached.  If there _is_ an attached tty, then you
# can just prompt the user like normal.
import sys
def read_secret_key():
    if sys.stdin.isatty():
        return getpass("Enter the secret key: ")
    else:
        return sys.stdin.readline()