Any subsequent bytes received will be discarded. The sequence can be any iterable object producing strings, typically a list of strings. Pexpect allows your script to spawn a child application and control it as if a human were typing commands. After that, the method will try to match your prompt pattern. Unrelated to my employer or anybody else. This emulates standard Python behavior with files. Alter the cmd to change the ssh client used, or to prepend it with network namespaces.
For example, if you 'su' to a different user then you will need to manually reset the prompt. Calling will erase the contents of the before attribute even if no prompt is ever matched. The run function can often be used instead of creating a spawn instance. If more than one pattern matches at that point, the leftmost in the pattern list is chosen. In other words, the stack trace inside the Pexpect module is not included.
In this mode, patterns for and should also be unicode. Note that anything the child sent before the echo will be lost, so you should be sure that your input buffer is empty before you call. This means to work as expected a sendeof has to be called at the beginning of a line. This returns True if the child was terminated. If an error occurred then 'before' will be set to all the data read so far and 'after' and 'match' will be None.
Otherwise run continues until the next event. The default number of bytes scanned at each iteration is very large and may be reduced to collaterally reduce search cost. This sends a character which causes the pending parent output buffer to be sent to the waiting child program without waiting for end-of-line. This allows you to match multiple optional responses. The Pexpect interface was designed to be easy to use. There are two main interfaces to the Pexpect system; these are the function, run and the class, spawn.
This returns True if the child was terminated. When the keyword argument timeout is specified as a number, default: 30 , then will be raised after the value specified has elapsed, in seconds, for any of the family of method calls. If more than one pattern matches at that point, the leftmost in the pattern list is chosen. If a prompt match is made for a hosts then keep asking until it stops matching. The echo attribute may be set to False to disable echoing of input.
This will catch these exceptions and return the index of the list entry instead of raising the exception. If a logfile is specified, a copy is written to that log. Is there a workaround instead of using pexpect. In other words, the child may have printed output then called exit ; but, technically, the child is still alive until its output is read. If timeout is None then the read may block indefinitely.
The attribute 'match' will be None. Note that calling more than once is valid. Then we hope for the best and blindly try to reset the prompt to something more unique. Python only garbage collects Python objects. Many X display managers xdm, gdm, kdm, etc. Let me know if I forgot anyone. The timeout is set low so that hosts that are already at the prompt will not slow things down too much.
More importantly, I was looking at old documentation on noah. Pexpect is free, open source, and all that good stuff. The pairing before and after class instance attributes are views of the data preceding and following the matching pattern. This method is also useful when you don't want to have to worry about escaping regular expression characters that you want to match. The newer documentation does show a sendcontrol method. Note that spawn is clever about finding commands on your path.