# Фильтр пустых строк в списке строк.

list = [x for x in list if x.strip()!='']

with open("/path/to/file") as f:

    for line in f:

        print(line)

f = open("/path/tofile", 'w')

for e in aList:

    f.write(e + "\n")

f.close()

sentence = "this is a test, not testing."

it = re.finditer('\\btest\\b', sentence)

for match in it:

    print("match position: " + str(match.start()) +"-"+ str(match.end()))

m = re.search('\d+-\d+', line) # search 123-123 like strings

if m:

    current = m.group(0)

db = MySQLdb.connect("localhost", "username", "password", "dbname")

cursor = db.cursor()

sql = "SELECT `name`, `age` FROM `ursers` ORDER BY `age` DESC"

cursor.execute(sql)

results = cursor.fetchall()

for row in results:

    print(row[0] + row[1])

db.close()

theList = ["a","b","c"]

joinedString = ",".join(theList)

targetList = list(set(targetList))

targetList = [v for v in targetList if not v.strip()=='']

# или

targetList = filter(lambda x: len(x)>0, targetList)

anotherList.extend(aList)

for k,v in aDict.iteritems():

    print(k + v)

myList = ['one', 'two', 'ten']

if 'one' in myList:

    print('Да')

x = {'a': 1, 'b': 2}

y = {'b': 3, 'c': 4}

z = {**x, **y}

print(z) # {'c': 4, 'a': 1, 'b': 3}