import commands
FILE = 'myfile.txt'
DIRROOT = '/home/donn'
cmd = 'cp -p %s/%s %s/tmp.txt' % (DIRROOT, FILE, DIRROOT)
print 'About to execute command: %s' % cmd
output = commands.getoutput(cmd)
print 'File %s copied as tmp.txt' % FILE
# Optionally, print the output of the command:
print 'Output of the command was: %s' % output
Grab the html of a URL
url = "http://search.ebay.com/search/search.dll?query=pentium&qty=y"
# Get search results.
try:
f = urllib.urlopen(url)
except:
print "HTTP client, urlopen error."
sys.exit()
data = f.read()
# Print the html.
print 'HTML received was:'
print data
# Search the html.
my_regex = r'mint\s+condition' # Use raw strings with regex!
if re.search(my_regex, data):
print 'String match found!'
else:
print 'No matches.'
Extract text you want from a long string
long_string = 'The quick brown fox on 212 Main Street jumped over 1024
lazy dogs.'
# We want to extract only the numbers from the string.
num_list = re.findall(r'[0-9]+', long_string)
print "List of numbers found: %s" % num_list
print 'First number is: %s' % num_list[0]
print 'All numbers are:'
for num in num_list:
print num
Extracting with more precision using regular expressions (Ignoring regex
parenthesis; Advanced regex)
# Only extract the first number (first octet) of IP addresses.
# Don't extract other numbers like '1024' and '19'. # Use "(?:" to suppress capturing parenethesis.
# Use "\." to match a dot (suppress regex meaning of ".")
# "{3}": Look for 3 iterations (3 iterations of a dot followed by
a number). my_regex = r'([0-9]+)(?:\.[0-9]+){3}'
first_digits = re.findall(my_regex, long_string)
print "First number of each IP address: %s" % first_digits
# Remove "?:" from my_regex and see the difference!
Remove Ctrl-M (^M) characters from a line (remove a char by octal number)
new_line = re.sub('\033', '', line)
Script to remove Ctrl-M (^M) characters from a line
#!/usr/bin/python import sys, re
if len(sys.argv) != 2:
print "Usage: this_script.py <input_file>"
sys.exit()
(tmp,FILE) = sys.argv
f = open(FILE, 'r')
data = f.readlines()
f.close()
newdata = []
for line in data:
s = re.sub('\015', '' , line)
newdata.append(s)
fo = open("%s.new" % FILE, 'w')
for line in newdata:
print line
fo.write(line)
fo.close()
print "Converted text saved as %s.new" % FILE
Send an email using smtplib module (comes with Python)
import smtplib, string
FROMADDR = '
' #
Author is Donn Lee.
SMTPSERVER = 'mail.myisp.net' # Put your own email server
here.
def EmailOut(toaddrs, subj, msg):
# SIMPLE FUNCTION THAT SENDS EMAIL.
# toaddrs MUST be a python list of email addresses.
# Convert list to string.
s_toaddrs = string.join(toaddrs, ",")
# Convert msg to smtp format.
msg = """\
To: %s
From: %s
Subject: %s
%s
""" % (s_toaddrs, FROMADDR, subj, msg)
try:
server = smtplib.SMTP(SMTPSERVER)
# If your mail server requires a username/login,
you'll need the following line.
#server.login('donnlee', 'mypassword')
server.sendmail(FROMADDR, toaddrs, msg)
server.quit()
except:
print "ERROR SENDING EMAIL! SMTP ERROR."
sys.exit()
# End of fn EmailOut().
toaddrs = ['
', '
']
subj = 'Greetings from Hawaii!'
msg = """\
Hello family,
Weather here has been great.
Unfortunately, I don't have access to any fancy email clients,
so I'm writing this email with this crazy unix server I found.
"""
# Send the email.
EmailOut(toaddrs, subj, msg)
Sending email using Bcc field Similar idea to EmailOut() function, but this time there are separate lists
for "To:" and "Bcc:"
import smtplib, string
FROMADDR = '
' # Author
is Donn Lee.
SMTPSERVER = 'mail.myisp.net' # Put your own email server here.
def EmailBcc(to_addrs, bcc_addrs, subj, msg):
# SIMPLE FUNCTION THAT SENDS EMAIL. # Combine the lists for smtplib.
total_addrs = []
for i in to_addrs:
total_addrs.append(i)
for i in bcc_addrs:
total_addrs.append(i)
print 'All receipients are: %s' % total_addrs
# Convert lists to strings for msg.
s_toaddrs = string.join(to_addrs, ",")
s_bccaddrs = string.join(bcc_addrs, ",")
# Convert msg to smtp format.
msg = """\
To: %s
From: %s
Subject: %s
Bcc: %s
print 'SMTP message text is:'; print msg
try:
print 'Sending email...'
server = smtplib.SMTP(SMTPSERVER)
# If your mail server requires a username/login,
you'll need the following line.
#server.login('donnlee', 'mypassword')
server.sendmail(FROMADDR, total_addrs, msg)
server.quit()
print 'Email sent!'
except:
print "ERROR SENDING EMAIL! SMTP ERROR."
sys.exit()
toaddrs = ['
']
bccaddrs = ['
', '
']
subj = 'Greetings from Hawaii!'
msg = """\
Hello family,
Weather here has been great.
Unfortunately, I don't have access to any fancy email clients,
so I'm writing this email with this crazy unix server I found.
"""
# Send the email.
EmailBcc(toaddrs, bccaddrs, subj, msg)
Read an email distribution list (simple text file, one address per line)
DIST_LIST = 'mydist.txt'
def ReadDistribution():
try:
f = open(DIST_LIST, 'r')
data = f.readlines()
f.close()
except:
print "Problem reading file %s." % DIST_LIST
# Don't quit abruptly so script stays alive.
return ['
', '
']
tmp = []
for i in data:
# Remove trailing CR.
tmp.append(i[:-1])
# Return a list of email addresses.
return tmp
Write a simple UDP server
import SocketServer, socket, string
class EchoHandler(SocketServer.DatagramRequestHandler):
def handle(self):
# Write client's addr and port #.
self.wfile.write("Data from %s"
% (self.client_address,))
bufsize = 1024 # May want to
increase this.
while 1:
line = self.rfile.read()
print "Got from client
%s: %s" % (self.client_address,line)
if not string.strip(line):
break
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