How do you spawn with Pexpect?

How do you spawn with Pexpect?

The Pexpect interface focuses on ease of use so that simple tasks are easy. There are two main interfaces to Pexpect – the function, run() and the class, spawn. You can call the run() function to execute a command and return the output. This is a handy replacement for os.

How do you close Pexpect spawn?

The elegant way is to send exit\r or CTRL-D and wait for EOF . But it’s also fine to simply exit the script (Expect, pexpect or winexpect) after you’ve done with the SSH session and don’t care about the exit status of the SSH session.

What is Sendline?

Pexpect can be used for automating interactive applications such as ssh, ftp, mencoder, passwd, etc. There are two important methods in Pexpect – expect() and send() (or sendline() which is like send() with a linefeed). The expect() method waits for the child application to return a given string.

How do I run Pexpect in Python?

Approach:

1. Import pexpect.
2. spawn a child with pexpect.
3. FTP client asks for the user name.
4. Send the username to child process with sendline method.
5. Then the FTP client asks for the password.
6. Then the serve logged in.
7. Detect whether you can send command to the FTP server by the presence of ‘ftp> ‘.

Which is the spawn function in pexpect?

There are two main interfaces to Pexpect – the function, run () and the class, spawn. You can call the run () function to execute a command and return the output. This is a handy replacement for os.system ().

How does the pexpect module in Python work?

Pexpect is a pure Python module for spawning child applications; controlling them; and responding to expected patterns in their output. Pexpect works like Don Libes’ Expect. Pexpect allows your script to spawn a child application and control it as if a human were typing commands.

How to read output from pexpect child?

In pexpect the before and after attributes are populated after an expect method. The most common thing used in this situation is waiting for the prompt (so you’ll know that the previous command finished execution). So, in your case, the code might look something like this:

Which is the more powerful interface in pexpect?

When you call the run () function it executes a given program and then returns the output. This is a handy replacement for os.system (). The spawn class is the more powerful interface to the Pexpect system.