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<!doctype html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Python: module fdpexpect</title>
</head><body bgcolor="#f0f0f8">
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading">
<tr bgcolor="#7799ee">
<td valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"> <br><big><big><strong>fdpexpect</strong></big></big> (version 2.1)</font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="file:/home/noah/documents/export/engineering/source/python/pexpect/trunk/pexpect/fdpexpect.py">/home/noah/documents/export/engineering/source/python/pexpect/trunk/pexpect/fdpexpect.py</a></font></td></tr></table>
<p><tt>TODO: This is BETA. When it gets stable I will move it into the pexpect.py file.</tt></p>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#aa55cc">
<td colspan=3 valign=bottom> <br>
<font color="#fffff" face="helvetica, arial"><big><strong>Modules</strong></big></font></td></tr>
<tr><td bgcolor="#aa55cc"><tt> </tt></td><td> </td>
<td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="os.html">os</a><br>
</td><td width="25%" valign=top></td><td width="25%" valign=top></td><td width="25%" valign=top></td></tr></table></td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ee77aa">
<td colspan=3 valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
<tr><td bgcolor="#ee77aa"><tt> </tt></td><td> </td>
<td width="100%"><dl>
<dt><font face="helvetica, arial"><a href="pexpect.html#spawn">pexpect.spawn</a>(<a href="__builtin__.html#object">__builtin__.object</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="fdpexpect.html#fdspawn">fdspawn</a>
</font></dt></dl>
</dd>
</dl>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom> <br>
<font color="#000000" face="helvetica, arial"><a name="fdspawn">class <strong>fdspawn</strong></a>(<a href="pexpect.html#spawn">pexpect.spawn</a>)</font></td></tr>
<tr bgcolor="#ffc8d8"><td rowspan=2><tt> </tt></td>
<td colspan=2><tt>This is like pexpect.<a href="pexpect.html#spawn">spawn</a> but allows you to supply your own,<br>
already open file descriptor. For example, you could use it to<br>
read through a file looking for patterns, or to control a modem or<br>
serial device.<br> </tt></td></tr>
<tr><td> </td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="fdpexpect.html#fdspawn">fdspawn</a></dd>
<dd><a href="pexpect.html#spawn">pexpect.spawn</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Methods defined here:<br>
<dl><dt><a name="fdspawn-__del__"><strong>__del__</strong></a>(self)</dt></dl>
<dl><dt><a name="fdspawn-__init__"><strong>__init__</strong></a>(self, fd, args<font color="#909090">=[]</font>, timeout<font color="#909090">=30</font>, maxread<font color="#909090">=2000</font>, searchwindowsize<font color="#909090">=None</font>, logfile<font color="#909090">=None</font>)</dt><dd><tt>This takes a file descriptor (an int) or an object that support the <a href="#fdspawn-fileno">fileno</a>() method<br>
(returning an int). All Python file-like objects support <a href="#fdspawn-fileno">fileno</a>().</tt></dd></dl>
<dl><dt><a name="fdspawn-close"><strong>close</strong></a>(self)</dt></dl>
<dl><dt><a name="fdspawn-isalive"><strong>isalive</strong></a>(self)</dt><dd><tt>This checks if the file descriptor is still valid.<br>
If os.fstat() does not raise an exception then we assume it is alive.</tt></dd></dl>
<dl><dt><a name="fdspawn-kill"><strong>kill</strong></a>(self, sig)</dt></dl>
<dl><dt><a name="fdspawn-terminate"><strong>terminate</strong></a>(self, force<font color="#909090">=False</font>)</dt></dl>
<hr>
Methods inherited from <a href="pexpect.html#spawn">pexpect.spawn</a>:<br>
<dl><dt><a name="fdspawn-__iter__"><strong>__iter__</strong></a>(self)</dt><dd><tt>This is to support iterators over a file-like object.</tt></dd></dl>
<dl><dt><a name="fdspawn-__str__"><strong>__str__</strong></a>(self)</dt><dd><tt>This returns the current state of the pexpect object as a string.</tt></dd></dl>
<dl><dt><a name="fdspawn-compile_pattern_list"><strong>compile_pattern_list</strong></a>(self, patterns)</dt><dd><tt>This compiles a pattern-string or a list of pattern-strings.<br>
Patterns must be a StringType, EOF, TIMEOUT, SRE_Pattern, or <br>
a list of those. Patterns may also be None which results in<br>
an empty list.<br>
<br>
This is used by <a href="#fdspawn-expect">expect</a>() when calling <a href="#fdspawn-expect_list">expect_list</a>().<br>
Thus <a href="#fdspawn-expect">expect</a>() is nothing more than::<br>
cpl = <a href="#fdspawn-compile_pattern_list">compile_pattern_list</a>(pl)<br>
return <a href="#fdspawn-expect_list">expect_list</a>(clp, timeout)<br>
<br>
If you are using <a href="#fdspawn-expect">expect</a>() within a loop it may be more<br>
efficient to compile the patterns first and then call <a href="#fdspawn-expect_list">expect_list</a>().<br>
This avoid calls in a loop to <a href="#fdspawn-compile_pattern_list">compile_pattern_list</a>():<br>
cpl = <a href="#fdspawn-compile_pattern_list">compile_pattern_list</a>(my_pattern)<br>
while some_condition:<br>
...<br>
i = <a href="#fdspawn-expect_list">expect_list</a>(clp, timeout)<br>
...</tt></dd></dl>
<dl><dt><a name="fdspawn-eof"><strong>eof</strong></a>(self)</dt><dd><tt>This returns True if the EOF exception was ever raised.</tt></dd></dl>
<dl><dt><a name="fdspawn-expect"><strong>expect</strong></a>(self, pattern, timeout<font color="#909090">=-1</font>, searchwindowsize<font color="#909090">=None</font>)</dt><dd><tt>This seeks through the stream until a pattern is matched.<br>
The pattern is overloaded and may take several types including a list.<br>
The pattern can be a StringType, EOF, a compiled re, or a list of<br>
those types. Strings will be compiled to re types. This returns the<br>
index into the pattern list. If the pattern was not a list this<br>
returns index 0 on a successful match. This may raise exceptions for<br>
EOF or TIMEOUT. To avoid the EOF or TIMEOUT exceptions add<br>
EOF or TIMEOUT to the pattern list.<br>
<br>
After a match is found the instance attributes<br>
'before', 'after' and 'match' will be set.<br>
You can see all the data read before the match in 'before'.<br>
You can see the data that was matched in 'after'.<br>
The re.MatchObject used in the re match will be in 'match'.<br>
If an error occured then 'before' will be set to all the<br>
data read so far and 'after' and 'match' will be None.<br>
<br>
If timeout is -1 then timeout will be set to the self.<strong>timeout</strong> value.<br>
<br>
Note: A list entry may be EOF or TIMEOUT instead of a string.<br>
This will catch these exceptions and return the index<br>
of the list entry instead of raising the exception.<br>
The attribute 'after' will be set to the exception type.<br>
The attribute 'match' will be None.<br>
This allows you to write code like this:<br>
index = p.expect (['good', 'bad', pexpect.EOF, pexpect.TIMEOUT])<br>
if index == 0:<br>
do_something()<br>
elif index == 1:<br>
do_something_else()<br>
elif index == 2:<br>
do_some_other_thing()<br>
elif index == 3:<br>
do_something_completely_different()<br>
instead of code like this:<br>
try:<br>
index = p.expect (['good', 'bad'])<br>
if index == 0:<br>
do_something()<br>
elif index == 1:<br>
do_something_else()<br>
except EOF:<br>
do_some_other_thing()<br>
except TIMEOUT:<br>
do_something_completely_different()<br>
These two forms are equivalent. It all depends on what you want.<br>
You can also just expect the EOF if you are waiting for all output<br>
of a child to finish. For example:<br>
p = pexpect.<a href="pexpect.html#spawn">spawn</a>('/bin/ls')<br>
p.expect (pexpect.EOF)<br>
print p.before<br>
<br>
If you are trying to optimize for speed then see <a href="#fdspawn-expect_list">expect_list</a>().</tt></dd></dl>
<dl><dt><a name="fdspawn-expect_exact"><strong>expect_exact</strong></a>(self, pattern_list, timeout<font color="#909090">=-1</font>)</dt><dd><tt>This method is no longer supported or allowed.<br>
It was too hard to maintain and keep it up to date with expect_list.<br>
Few people used this method. Most people favored reliability over speed.<br>
The implementation is left in comments in case anyone needs to hack this<br>
feature back into their copy.<br>
If someone wants to diff this with expect_list and make them work<br>
nearly the same then I will consider adding this make in.</tt></dd></dl>
<dl><dt><a name="fdspawn-expect_list"><strong>expect_list</strong></a>(self, pattern_list, timeout<font color="#909090">=-1</font>, searchwindowsize<font color="#909090">=-1</font>)</dt><dd><tt>This takes a list of compiled regular expressions and returns <br>
the index into the pattern_list that matched the child output.<br>
The list may also contain EOF or TIMEOUT (which are not<br>
compiled regular expressions). This method is similar to<br>
the <a href="#fdspawn-expect">expect</a>() method except that <a href="#fdspawn-expect_list">expect_list</a>() does not<br>
recompile the pattern list on every call.<br>
This may help if you are trying to optimize for speed, otherwise<br>
just use the <a href="#fdspawn-expect">expect</a>() method. This is called by <a href="#fdspawn-expect">expect</a>().<br>
If timeout==-1 then the self.<strong>timeout</strong> value is used.<br>
If searchwindowsize==-1 then the self.<strong>searchwindowsize</strong> value is used.</tt></dd></dl>
<dl><dt><a name="fdspawn-fileno"><strong>fileno</strong></a>(self)</dt><dd><tt>This returns the file descriptor of the pty for the child.</tt></dd></dl>
<dl><dt><a name="fdspawn-flush"><strong>flush</strong></a>(self)</dt><dd><tt>This does nothing. It is here to support the interface for a File-like object.</tt></dd></dl>
<dl><dt><a name="fdspawn-getwinsize"><strong>getwinsize</strong></a>(self)</dt><dd><tt>This returns the terminal window size of the child tty.<br>
The return value is a tuple of (rows, cols).</tt></dd></dl>
<dl><dt><a name="fdspawn-interact"><strong>interact</strong></a>(self, escape_character<font color="#909090">='<font color="#c040c0">\x1d</font>'</font>, input_filter<font color="#909090">=None</font>, output_filter<font color="#909090">=None</font>)</dt><dd><tt>This gives control of the child process to the interactive user<br>
(the human at the keyboard).<br>
Keystrokes are sent to the child process, and the stdout and stderr<br>
output of the child process is printed.<br>
This simply echos the child stdout and child stderr to the real<br>
stdout and it echos the real stdin to the child stdin.<br>
When the user types the escape_character this method will stop.<br>
The default for escape_character is ^]. This should not be confused<br>
with ASCII 27 -- the ESC character. ASCII 29 was chosen<br>
for historical merit because this is the character used<br>
by 'telnet' as the escape character. The escape_character will<br>
not be sent to the child process.<br>
<br>
You may pass in optional input and output filter functions.<br>
These functions should take a string and return a string.<br>
The output_filter will be passed all the output from the child process.<br>
The input_filter will be passed all the keyboard input from the user.<br>
The input_filter is run BEFORE the check for the escape_character.<br>
<br>
Note that if you change the window size of the parent<br>
the SIGWINCH signal will not be passed through to the child.<br>
If you want the child window size to change when the parent's<br>
window size changes then do something like the following example:<br>
import pexpect, struct, fcntl, termios, signal, sys<br>
def sigwinch_passthrough (sig, data):<br>
s = struct.pack("HHHH", 0, 0, 0, 0)<br>
a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.<a href="#fdspawn-fileno">fileno</a>(), termios.TIOCGWINSZ , s))<br>
global p<br>
p.<a href="#fdspawn-setwinsize">setwinsize</a>(a[0],a[1])<br>
p = pexpect.<a href="pexpect.html#spawn">spawn</a>('/bin/bash') # Note this is global and used in sigwinch_passthrough.<br>
signal.signal(signal.SIGWINCH, sigwinch_passthrough)<br>
p.<a href="#fdspawn-interact">interact</a>()</tt></dd></dl>
<dl><dt><a name="fdspawn-isatty"><strong>isatty</strong></a>(self)</dt><dd><tt>This returns True if the file descriptor is open and connected to a tty(-like) device, else False.</tt></dd></dl>
<dl><dt><a name="fdspawn-next"><strong>next</strong></a>(self)</dt><dd><tt>This is to support iterators over a file-like object.</tt></dd></dl>
<dl><dt><a name="fdspawn-read"><strong>read</strong></a>(self, size<font color="#909090">=-1</font>)</dt><dd><tt>This reads at most "size" bytes from the file <br>
(less if the read hits EOF before obtaining size bytes). <br>
If the size argument is negative or omitted, <br>
read all data until EOF is reached. <br>
The bytes are returned as a string object. <br>
An empty string is returned when EOF is encountered immediately.</tt></dd></dl>
<dl><dt><a name="fdspawn-read_nonblocking"><strong>read_nonblocking</strong></a>(self, size<font color="#909090">=1</font>, timeout<font color="#909090">=-1</font>)</dt><dd><tt>This reads at most size characters from the child application.<br>
It includes a timeout. If the read does not complete within the<br>
timeout period then a TIMEOUT exception is raised.<br>
If the end of file is read then an EOF exception will be raised.<br>
If a log file was set using <a href="#fdspawn-setlog">setlog</a>() then all data will<br>
also be written to the log file.<br>
<br>
If timeout==None then the read may block indefinitely.<br>
If timeout==-1 then the self.<strong>timeout</strong> value is used.<br>
If timeout==0 then the child is polled and <br>
if there was no data immediately ready then this will raise a TIMEOUT exception.<br>
<br>
The "timeout" refers only to the amount of time to read at least one character.<br>
This is not effected by the 'size' parameter, so if you call<br>
<a href="#fdspawn-read_nonblocking">read_nonblocking</a>(size=100, timeout=30) and only one character is<br>
available right away then one character will be returned immediately. <br>
It will not wait for 30 seconds for another 99 characters to come in.<br>
<br>
This is a wrapper around os.<a href="#fdspawn-read">read</a>().<br>
It uses select.select() to implement a timeout.</tt></dd></dl>
<dl><dt><a name="fdspawn-readline"><strong>readline</strong></a>(self, size<font color="#909090">=-1</font>)</dt><dd><tt>This reads and returns one entire line. A trailing newline is kept in<br>
the string, but may be absent when a file ends with an incomplete line. <br>
Note: This <a href="#fdspawn-readline">readline</a>() looks for a \r\n pair even on UNIX because<br>
this is what the pseudo tty device returns. So contrary to what you<br>
may expect you will receive the newline as \r\n.<br>
An empty string is returned when EOF is hit immediately.<br>
Currently, the size agument is mostly ignored, so this behavior is not<br>
standard for a file-like object. If size is 0 then an empty string<br>
is returned.</tt></dd></dl>
<dl><dt><a name="fdspawn-readlines"><strong>readlines</strong></a>(self, sizehint<font color="#909090">=-1</font>)</dt><dd><tt>This reads until EOF using <a href="#fdspawn-readline">readline</a>() and returns a list containing <br>
the lines thus read. The optional "sizehint" argument is ignored.</tt></dd></dl>
<dl><dt><a name="fdspawn-send"><strong>send</strong></a>(self, str)</dt><dd><tt>This sends a string to the child process.<br>
This returns the number of bytes written.<br>
If a log file was set then the data is also written to the log.</tt></dd></dl>
<dl><dt><a name="fdspawn-sendeof"><strong>sendeof</strong></a>(self)</dt><dd><tt>This sends an EOF to the child.<br>
This sends a character which causes the pending parent output<br>
buffer to be sent to the waiting child program without<br>
waiting for end-of-line. If it is the first character of the<br>
line, the <a href="#fdspawn-read">read</a>() in the user program returns 0, which<br>
signifies end-of-file. This means to work as expected <br>
a <a href="#fdspawn-sendeof">sendeof</a>() has to be called at the begining of a line. <br>
This method does not send a newline. It is the responsibility<br>
of the caller to ensure the eof is sent at the beginning of a line.</tt></dd></dl>
<dl><dt><a name="fdspawn-sendline"><strong>sendline</strong></a>(self, str<font color="#909090">=''</font>)</dt><dd><tt>This is like <a href="#fdspawn-send">send</a>(), but it adds a line feed (os.linesep).<br>
This returns the number of bytes written.</tt></dd></dl>
<dl><dt><a name="fdspawn-setecho"><strong>setecho</strong></a>(self, state)</dt><dd><tt>This sets the terminal echo mode on or off.<br>
Note that anything the child sent before the echo will be lost, so<br>
you should be sure that your input buffer is empty before you setecho.<br>
For example, the following will work as expected.<br>
p = pexpect.<a href="pexpect.html#spawn">spawn</a>('cat')<br>
p.sendline ('1234') # We will see this twice (once from tty echo and again from cat).<br>
p.expect (['1234'])<br>
p.expect (['1234'])<br>
p.<a href="#fdspawn-setecho">setecho</a>(False) # Turn off tty echo<br>
p.sendline ('abcd') # We will set this only once (echoed by cat).<br>
p.sendline ('wxyz') # We will set this only once (echoed by cat)<br>
p.expect (['abcd'])<br>
p.expect (['wxyz'])<br>
The following WILL NOT WORK because the lines sent before the setecho<br>
will be lost:<br>
p = pexpect.<a href="pexpect.html#spawn">spawn</a>('cat')<br>
p.sendline ('1234') # We will see this twice (once from tty echo and again from cat).<br>
p.<a href="#fdspawn-setecho">setecho</a>(False) # Turn off tty echo<br>
p.sendline ('abcd') # We will set this only once (echoed by cat).<br>
p.sendline ('wxyz') # We will set this only once (echoed by cat)<br>
p.expect (['1234'])<br>
p.expect (['1234'])<br>
p.expect (['abcd'])<br>
p.expect (['wxyz'])</tt></dd></dl>
<dl><dt><a name="fdspawn-setlog"><strong>setlog</strong></a>(self, fileobject)</dt><dd><tt>This method is no longer supported or allowed.</tt></dd></dl>
<dl><dt><a name="fdspawn-setmaxread"><strong>setmaxread</strong></a>(self, maxread)</dt><dd><tt>This method is no longer supported or allowed.<br>
I don't like getters and setters without a good reason.</tt></dd></dl>
<dl><dt><a name="fdspawn-setwinsize"><strong>setwinsize</strong></a>(self, r, c)</dt><dd><tt>This sets the terminal window size of the child tty.<br>
This will cause a SIGWINCH signal to be sent to the child.<br>
This does not change the physical window size.<br>
It changes the size reported to TTY-aware applications like<br>
vi or curses -- applications that respond to the SIGWINCH signal.</tt></dd></dl>
<dl><dt><a name="fdspawn-wait"><strong>wait</strong></a>(self)</dt><dd><tt>This waits until the child exits. This is a blocking call.<br>
This will not read any data from the child, so this will block forever<br>
if the child has unread output and has terminated. In other words, the child<br>
may have printed output then called exit(); but, technically, the child is<br>
still alive until its output is read.</tt></dd></dl>
<dl><dt><a name="fdspawn-write"><strong>write</strong></a>(self, str)</dt><dd><tt>This is similar to <a href="#fdspawn-send">send</a>() except that there is no return value.</tt></dd></dl>
<dl><dt><a name="fdspawn-writelines"><strong>writelines</strong></a>(self, sequence)</dt><dd><tt>This calls <a href="#fdspawn-write">write</a>() for each element in the sequence.<br>
The sequence can be any iterable object producing strings, <br>
typically a list of strings. This does not add line separators<br>
There is no return value.</tt></dd></dl>
<hr>
Data and other attributes inherited from <a href="pexpect.html#spawn">pexpect.spawn</a>:<br>
<dl><dt><strong>__dict__</strong> = <dictproxy object><dd><tt>dictionary for instance variables (if defined)</tt></dl>
<dl><dt><strong>__weakref__</strong> = <attribute '__weakref__' of 'spawn' objects><dd><tt>list of weak references to the object (if defined)</tt></dl>
</td></tr></table></td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#55aa55">
<td colspan=3 valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></font></td></tr>
<tr><td bgcolor="#55aa55"><tt> </tt></td><td> </td>
<td width="100%"><strong>__all__</strong> = ['fdspawn']<br>
<strong>__revision__</strong> = '$Revision: 395 $'<br>
<strong>__version__</strong> = '2.1'</td></tr></table>
</body></html>
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