Python Paramiko – Run command

I’m try to run this script:

hostname = '192.168.3.4'
port = 22
username = 'username'
password = 'mypassword'
y = "2012"
m = "02"
d = "27"

if __name__ == "__main__":
   s = paramiko.SSHClient()
   s.load_system_host_keys()
   s.connect(hostname, port, username, password)
   command = 'ls /home/user/images/cappi/03000/y/m/d'
   s.close

The question is:
how can I put the variables y,m,d into the variable command ?

Answers:

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Method 1

Python has lots of ways to perform string formatting. One of the simplest is to simply concatenate the parts of your string together:

#!/usr/bin/env python
hostname = '192.168.3.4'    
port = 22
username = 'username'
password = 'mypassword'
y = "2012"
m = "02"
d = "27"

def do_it():
    s = paramiko.SSHClient()
    s.load_system_host_keys()
    s.connect(hostname, port, username, password)
    command = 'ls /home/user/images/cappi/03000/' + y + '/' + m + '/' + d
    (stdin, stdout, stderr) = s.exec_command(command)
    for line in stdout.readlines():
        print line
    s.close()

if __name__ == "main":
    do_it()

Method 2

command = 'ls /home/user/images/cappi/03000/%s/%s/%s' %(y,m,d)

Method 3

Using the new format specifications, you can access arguments by name:

'ls /home/user/images/cappi/03000/{year}/{month}/{day}'.format(year=y, month=m, day=d)

Method 4

I prefer

command = f"ls /home/user/images/cappi/03000/{y}/{m}/{d}"

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0