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| author | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
|---|---|---|
| committer | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
| commit | 27e183a78c8062ed7c2bbb91655a5e56cd697bba (patch) | |
| tree | 88fd355a0cc6da4c130582e092d702836596cbb2 /examples/getNTPservers.py | |
| parent | 4ba589cf13588e90992e23deb5a9784340efd2cc (diff) | |
| download | pyparsing-git-27e183a78c8062ed7c2bbb91655a5e56cd697bba.tar.gz | |
Move src to root
Diffstat (limited to 'examples/getNTPservers.py')
| -rw-r--r-- | examples/getNTPservers.py | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/examples/getNTPservers.py b/examples/getNTPservers.py new file mode 100644 index 0000000..bbf1d60 --- /dev/null +++ b/examples/getNTPservers.py @@ -0,0 +1,30 @@ +# getNTPservers.py
+#
+# Demonstration of the parsing module, implementing a HTML page scanner,
+# to extract a list of NTP time servers from the NIST web site.
+#
+# Copyright 2004, by Paul McGuire
+#
+from pyparsing import Word, Combine, Suppress, CharsNotIn, nums
+import urllib.request, urllib.parse, urllib.error
+
+integer = Word(nums)
+ipAddress = Combine( integer + "." + integer + "." + integer + "." + integer )
+tdStart = Suppress("<td>")
+tdEnd = Suppress("</td>")
+timeServerPattern = tdStart + ipAddress.setResultsName("ipAddr") + tdEnd + \
+ tdStart + CharsNotIn("<").setResultsName("loc") + tdEnd
+
+# get list of time servers
+nistTimeServerURL = "http://www.boulder.nist.gov/timefreq/service/time-servers.html"
+serverListPage = urllib.request.urlopen( nistTimeServerURL )
+serverListHTML = serverListPage.read()
+serverListPage.close()
+
+addrs = {}
+for srvr,startloc,endloc in timeServerPattern.scanString( serverListHTML ):
+ print(srvr.ipAddr, "-", srvr.loc)
+ addrs[srvr.ipAddr] = srvr.loc
+ # or do this:
+ #~ addr,loc = srvr
+ #~ print addr, "-", loc
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