>>> import reprlib>>> reprlib.repr(set('supercalifragilisticexpialidocious'))"set(['a', 'c', 'd', 'e', 'f', 'g', ...])"

>>> import pprint>>> t = [[[['black', 'cyan'], 'white', ['green', 'red']], [['magenta',...     'yellow'], 'blue']]]...>>> pprint.pprint(t, width=30)[[[['black', 'cyan'],   'white',   ['green', 'red']],  [['magenta', 'yellow'],   'blue']]]

>>> import textwrap>>> doc = """The wrap() method is just like fill() except that it returns... a list of strings instead of one big string with newlines to separate... the wrapped lines."""...>>> print(textwrap.fill(doc, width=40))The wrap() method is just like fill()except that it returns a list of stringsinstead of one big string with newlinesto separate the wrapped lines.

>>> import locale>>> locale.setlocale(locale.LC_ALL, 'English_United States.1252')'English_United States.1252'>>> conv = locale.localeconv()          # get a mapping of conventions>>> x = 1234567.8>>> locale.format("%d", x, grouping=True)'1,234,567'>>> locale.format_string("%s%.*f", (conv['currency_symbol'],...                      conv['frac_digits'], x), grouping=True)'$1,234,567.80'

>>> from string import Template>>> t = Template('${village}folk send $$10 to $cause.')>>> t.substitute(village='Nottingham', cause='the ditch fund')'Nottinghamfolk send $10 to the ditch fund.'

>>> t = Template('Return the $item to $owner.')>>> d = dict(item='unladen swallow')>>> t.substitute(d)Traceback (most recent call last):  ...KeyError: 'owner'>>> t.safe_substitute(d)'Return the unladen swallow to $owner.'

>>> import time, os.path>>> photofiles = ['img_1074.jpg', 'img_1076.jpg', 'img_1077.jpg']>>> class BatchRename(Template):...     delimiter = '%'>>> fmt = input('Enter rename style (%d-date %n-seqnum %f-format):  ')Enter rename style (%d-date %n-seqnum %f-format):  Ashley_%n%f
>>> t = BatchRename(fmt)>>> date = time.strftime('%d%b%y')>>> for i, filename in enumerate(photofiles):...     base, ext = os.path.splitext(filename)...     newname = t.substitute(d=date, n=i, f=ext)...     print('{0} --> {1}'.format(filename, newname))
img_1074.jpg --> Ashley_0.jpgimg_1076.jpg --> Ashley_1.jpgimg_1077.jpg --> Ashley_2.jpg

import struct
with open('myfile.zip', 'rb') as f:    data = f.read()
start = 0for i in range(3):                      # show the first 3 file headers    start += 14    fields = struct.unpack('<IIIHH', data[start:start+16])    crc32, comp_size, uncomp_size, filenamesize, extra_size = fields
    start += 16    filename = data[start:start+filenamesize]    start += filenamesize    extra = data[start:start+extra_size]    print(filename, hex(crc32), comp_size, uncomp_size)
    start += extra_size + comp_size     # skip to the next header

import threading, zipfile
class AsyncZip(threading.Thread):    def __init__(self, infile, outfile):        threading.Thread.__init__(self)        self.infile = infile        self.outfile = outfile    def run(self):        f = zipfile.ZipFile(self.outfile, 'w', zipfile.ZIP_DEFLATED)        f.write(self.infile)        f.close()        print('Finished background zip of:', self.infile)
background = AsyncZip('mydata.txt', 'myarchive.zip')background.start()print('The main program continues to run in foreground.')
background.join()    # Wait for the background task to finishprint('Main program waited until background was done.')

import logginglogging.debug('Debugging information')logging.info('Informational message')logging.warning('Warning:config file %s not found', 'server.conf')logging.error('Error occurred')logging.critical('Critical error -- shutting down')

WARNING:root:Warning:config file server.conf not foundERROR:root:Error occurredCRITICAL:root:Critical error -- shutting down

>>> import weakref, gc>>> class A:...     def __init__(self, value):...         self.value = value...     def __repr__(self):...         return str(self.value)...>>> a = A(10)                   # create a reference>>> d = weakref.WeakValueDictionary()>>> d['primary'] = a            # does not create a reference>>> d['primary']                # fetch the object if it is still alive10>>> del a                       # remove the one reference>>> gc.collect()                # run garbage collection right away0>>> d['primary']                # entry was automatically removedTraceback (most recent call last):  File "<stdin>", line 1, in <module>    d['primary']                # entry was automatically removed  File "C:/python34/lib/weakref.py", line 46, in __getitem__    o = self.data[key]()KeyError: 'primary'

>>> from array import array>>> a = array('H', [4000, 10, 700, 22222])>>> sum(a)26932>>> a[1:3]array('H', [10, 700])

>>> from collections import deque>>> d = deque(["task1", "task2", "task3"])>>> d.append("task4")>>> print("Handling", d.popleft())Handling task1

unsearched = deque([starting_node])def breadth_first_search(unsearched):    node = unsearched.popleft()    for m in gen_moves(node):        if is_goal(m):            return m        unsearched.append(m)

>>> import bisect>>> scores = [(100, 'perl'), (200, 'tcl'), (400, 'lua'), (500, 'python')]>>> bisect.insort(scores, (300, 'ruby'))>>> scores[(100, 'perl'), (200, 'tcl'), (300, 'ruby'), (400, 'lua'), (500, 'python')]

>>> from heapq import heapify, heappop, heappush>>> data = [1, 3, 5, 7, 9, 2, 4, 6, 8, 0]>>> heapify(data)                      # rearrange the list into heap order>>> heappush(data, -5)                 # add a new entry>>> [heappop(data) for i in range(3)]  # fetch the three smallest entries[-5, 0, 1]

>>> from decimal import *>>> round(Decimal('0.70') * Decimal('1.05'), 2)Decimal('0.74')>>> round(.70 * 1.05, 2)0.73

>>> Decimal('1.00') % Decimal('.10')Decimal('0.00')>>> 1.00 % 0.100.09999999999999995
>>> sum([Decimal('0.1')]*10) == Decimal('1.0')True>>> sum([0.1]*10) == 1.0False

>>> getcontext().prec = 36>>> Decimal(1) / Decimal(7)Decimal('0.142857142857142857142857142857142857')