Google Python Class Day2

Copy & Paste Python code from https://developers.google.com/edu/python/regular-expressions

#Python Regular Expressions;
import re

match = re.search('iig', 'called piiig')
print match.group()

def Find(pat, text):
    match = re.search(pat, text)
    if match: print match.group()
    else: print 'Not Found'

# Basic Examples
. indicate any char
\w word char
\d digit
\s whitespace
\S non-whitespace
+ 1 or more
* 0 or more

Find('iig', 'called piiig')
Find('...g', 'callled piiig')
Find('..gs', 'called piiig')
Find('x..g', 'callled piig  much better :xyzgs')
Find(r'c\.l', 'c.llled piig  much better :xyzgs')
Find(r':\w\w\w', 'blah :cat blah blah')
Find(r'\d\d\d', 'blah : 123****')
Find(r'\d\s\d\s\d', 'blah : 1 2 3 ****')
Find(r'\d\s+\d\s+\d', '1               2            3')
Find(r':\w+', 'blah blah :kitten blabh blah')
Find(r':\w+', 'blah blah :kitten123 blabh blah')
Find(r':\w+', 'blah blah :kitten& blabh blah')
Find(r':.+', 'blah blah :kitten blabh blah')
Find(r':\w+', 'blah blah :kitten123123 blabh blah')
Find(r':\S+', 'blah blah :kitten123123&a=123&yatta blabh blah')

# Email examples
Find(r'\w+@\w+', 'purple alice-b@google.com monkey dishwasher')
Find(r'\w+@\w+', 'purple alice-b@google.com monkey dishwasher')
Find(r'\w[\w.]*+@[\w.]+', 'purple alice-b@google.com monkey dishwasher')

# Group Extraction
m = re.search(r'([\w.]+)@([\w.]+)', 'purple alice-b@google.com monkey dishwasher ')
print m.group()
print m.group(1)
print m.group(2)

# findall With Files
m = re.findall(r'[\w.-]+@[\w.]+', 'purple alice-b@google.com monkey dishwasher foo@bar')
m = re.findall(r'([\w.-]+)@([\w.]+)', 'purple alice-b@google.com monkey dishwasher foo@bar')
print m

# findall and Groups
str = 'purple alice@google.com, blah monkey bob@abc.com blah dishwasher'
tuples = re.findall(r'([\w\.-]+)@([\w\.-]+)', str)
print tuples  ## [('alice', 'google.com'), ('bob', 'abc.com')]
for tuple in tuples:
  print tuple[0]  ## username
  print tuple[1]  ## host

# Utilities
# File System -- os, os.path, shutil
import os
dir(os)
help(os.listdir)

# Hello.py contain examples
# Running External Processes -- commands
print os.path.exists('/tmp/foo')
import shutil
#shutil.copy(source, dest)

import commands
#cmd = 'ls'
#print commands.getstatusoutput(cmd)

# Exceptions

# HTTP -- urllib and urlparse
import urllib
uf = urllib.urlopen('http://google.com')
uf.read()
urllib.urlretrieve("http://google.com/...*gif", 'blah.gif')

# cat Hello.py
import sys
import os
import commands

def list(dir):
 
    # File System -- os, os.path, shutil
    filenames = os.listdir(dir)
    print filenames
       
    for filename in filenames:
        print filename 
        print os.path.join(dir, filename)
        print os.path.abspath(os.path.join(dir, filename))
   
    # Running External Processes -- commands
    cmd = 'ls -l ' + dir
    (status, output) = commands.getstatusoutput(cmd)
    if status:
        sys.stderr.write(output)
        sys.exit(1)
    print output
   
def Hello(name):
    if name == 'Alice' or name == 'Nick':
        name = name + '?????'
        DoesNotExit
    else:
        name = name + "!!!!!"
    print 'Hello', name


def Cat(filename):
    try:
       f = open(filename, 'rU')
       print '-----', filename
       #for line in f:
       #    print line,
   
       #lines = f.readlines()
       #print lines
       text = f.read()
       print text,
       f.close()
    except IOError:
        sys.stderr.write('problem reading:' + filename)

def main():
    print Cat(sys.argv[1])
    #print Hello(sys.argv[1])
    #print list(sys.argv[1])
   
if __name__=='__main__':
    main()

    print 'this is {1}, that is {0}'.format(a,b)
    print 'this is {0}, that is {1}'.format(a,b)
    print 'this is {0}, that is {1}, this is too is {1}'.format(a,b)
    print 'tis is {bob} and that is {fred}'.format(bob = a, fred = b)
    d = dict(bob = a, fred = b)
    print 'this is {bob} and that is {fred}'.format(**d)