python snippets

snippets.py

##string
ustring = u'A unicode \u018e string \xf1'
s = unistring.encode('utf-8')
t = unicode(s, 'utf-8')

##list
strs = ['ccc', 'aaaa', 'd', 'bb']
print sorted(strs, key=len)  ## ['d', 'bb', 'ccc', 'aaaa']

##tuple
(x, y, z) = (42, 13, "hike")
print z  ## hike

##list comprehensions
fruits = ['apple', 'cherry', 'bannana', 'lemon']
afruits = [ s.upper() for s in fruits if 'a' in s ]
 
##dict
hash = {}
hash['word'] = 'garfield'
hash['count'] = 42
s = 'I want %(count)d copies of %(word)s' % hash  # %d for int, %s for string

##regular expression
match = re.search(r'iii', 'piiig')  ##match.group() == "iii"

str = 'purple alice@google.com, blah monkey bob@abc.com blah dishwasher'
emails = re.findall(r'[\w\.-]+@[\w\.-]+', str)
for email in emails:
    print email


##urllib
ufile = urllib.urlopen(url)
text = ufile.read()
info = ufile.info()

##os
os.listdir('.')

##cmds
(status, output) = commands.getstatusoutput(cmd)