Pexpect for windows

This sends the given signal to the child application. In keeping with UNIX tradition it has a misleading name. It does not necessarily kill the child unless you send the right signal. If the size argument is negative or omitted, read all data until EOF is reached.

The bytes are returned as a string object. An empty string is returned when EOF is encountered immediately. This reads at most size characters from the child application. It includes a timeout. If the end of file is read then an EOF exception will be raised. If a log file was set using setlog then all data will also be written to the log file.

If timeout is None then the read may block indefinitely. If timeout is -1 then the self. The timeout refers only to the amount of time to read at least one character. It will not wait for 30 seconds for another 99 characters to come in. This reads and returns one entire line. A trailing newline is kept in the string, but may be absent when a file ends with an incomplete line. Note: This readline looks for a rn pair even on UNIX because this is what the pseudo tty device returns. So contrary to what you may expect you will receive the newline as rn.

An empty string is returned when EOF is hit immediately. Currently, the size argument is mostly ignored, so this behavior is not standard for a file-like object. If size is 0 then an empty string is returned. This reads until EOF using readline and returns a list containing the lines thus read. This sends a string to the child process. This returns the number of bytes written. If a log file was set then the data is also written to the log.

This sends a control character to the child such as Ctrl-C or Ctrl-D. This sends an EOF to the child. 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.

If it is the first character of the line, the read in the user program returns 0, which signifies end-of-file. This means to work as expected a sendeof has to be called at the beginning of a line.

This method does not send a newline. It is the responsibility of the caller to ensure the eof is sent at the beginning of a line. This is like send , but it adds a line feed os. This sets the terminal echo mode on or off. 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 setecho.

For example, the following will work as expected:. This method is no longer supported or allowed. This sets the terminal window size of the child tty.

This does not change the physical window size. This forces a child process to terminate. This returns True if the child was terminated. This returns False if the child could not be terminated. This waits until the child exits. This is a blocking call. The string you specify is a regular expression , so you can match complicated patterns. The following will always return just one character: child. This example will match successfully, but will always return no characters: child.

The pattern given to expect may also be a list of regular expressions, this allows you to match multiple optional responses. After each call to expect the before and after properties will be set to the text printed by child application.

The after string will contain the text that was matched by the expected pattern. Expect that character to delimit the string. You would need some numbers and at least one non-number at the end. If you get the string value of a pexpect. The following will turn on logging and send output to stdout the screen :. The sys. With Python 2, one has to assign just sys. Note that two flavors of EOF Exception may be thrown.

They are virtually identical except for the message string. For practical purposes you should have no need to distinguish between them, but they do give a little extra information about what type of platform you are running. The two messages are:. EOF method. The expect and read methods will also timeout if the child does not generate any output for a given amount of time. You can have these methods ignore timeout and block indefinitely by passing None for the timeout parameter:.

Pexpect can be used on Windows to wait for a pattern to be produced by a child process, using pexpect. PopenSpawn , or a file descriptor, using pexpect. Cross platform code must not use these. PopenSpawn is not a direct replacement for spawn. Many programs only offer interactive behaviour if they detect that they are running in a terminal.

When run by PopenSpawn , they may behave differently. Pexpect stable. Here is an example of Pexpect in action: This connects to the openbsd ftp site and downloads the recursive directory listing.

The following code fragment gives an example of this: child.