Python

Re.matchRe.match tries to match a pattern from the beginning of the string, such as: The following example matches the first word.Import reText = "Jgood is a handsome boy, he's cool, clever, and soon ..."m = Re.match (r "(\w+) \s", text)If M:Print M.

all know that Python is very strict in format requirements, wrote some python but did not find him strictly where, today metindentationerror:unexpected IndentI didn't know how strict he was by mistake. I met you later.indentationerror:unexpected

There are two methods in the Copy module, Copy.copy () and copy.deepcopy, which are used to implement both shallow and deep copies, respectively. The so-called shallow copy is a copy-only reference, the two variables generated after the copy is

PrincipleShallow copyImport= Copy.copy (a)Demo>>> a=[1,['a']]>>> b=a>>> c=Copy.copy (a)>>>a[1, ['a']]>>>b[1, ['a']]>>>c[1, ['a']]>>>ID (a)140556196249680>>>ID (b)140556196249680>>>ID (c)140556298139120>>> a[0]=2>>>a[2, ['a']]>>>c[1,

1. \d can match a number. ' 00\d ' can match ' 007 '.2. \w can match one character. ' \w\w\d ' can match ' py3 '.3.. can match any character. ' Py. ' Can match ' PYc ', ' pc0 ', ' py! ',4. * denotes any character (including 0).5. + represents at

OS PackageWe often deal with files and directories, and for these operations Python provides an OS module that contains many functions for manipulating files and directories. If you understand Linux basic operations, some of the following OS

The hub forms the Eventlet event loop, which distributes I/O events, dispatch greenthread. The presence of the hub allows the association to be promoted to greenthreads.Eventlet has multiple hub implementations, so you should choose the one that

Here are just a few of the common uses, specific principles and detailed explanations of the website's documentation:First, Introduction:Argparse is a standard module used by Python to parse command-line arguments and options in place of obsolete

First, the definitionLambda arg1,arg2 ...: returnvalueIi. Examples# !/usr/bin/python def f (x, y ): return x*yprint f (2,3)#6Lambda x,y:x*yprint g (2,3)#6Third, switch of a realization scheme#!/usr/bin/python from __future__ ImportDivision#A=int (

First, mathematics-related1, Absolute Value: ABS (-1)2, Maximum minimum: max ([+ +]), min ([[+])3. Sequence Length: Len (' abc '), Len ([+]), Len ((+))4, take the mold: Divmod (5,2)//(2,1)5. Powers: Pow (2,3,4)//2**3/46, floating point: Round (1)//1.

One, list: Create a list >>> list1 = [' Small three ', ' small Four ', ' small Five ', ' small Six ', ' small seven ']>>> list1[' small Three ', ' small Four ', ' small Five ', ' Little Six ', ' Little Seven ']2. Inserting elementsThe

Recently looked at the bottle.py source code, the inside has customized several class dictionary class. The definitions of these classes inherit multiple abstract classes in collections. Like mutablemapping. 1, before the abstract class, the first

Second, Ubuntu 12.04hadoop2.6 configuration and installation1. Java7 Configuration#su#addusermyhasplAdd SU permissions belowMake MYHASPL users belong to the sudo group#vi/etc/groupSudo:x:27:,myhasplAnd then restart#rebootGo to MYHASPL user and start

If the key is in the dictionary, the value corresponding to the key is returned. If the key is not in the dictionary, insert the key into the dictionary and use default as the value of the key and return to default. Default value is None>>> dict={}>>

Http://www.cnblogs.com/xuxm2007/archive/2010/08/04/1792463.htmlWhen you open a. py file, you will often see if __name__ = = ' __main__ ' at the bottom of the code: Now let's introduce its role.The module is an object, and all modules have a built-in

To get a clear picture of a deep copy in Python, you need to figure out the following concepts:Variables-References-Objects (Mutable objects, immutable objects)-slices-copy (shallow copy, deep copy)" Variable-Object-Reference "In Python everything

http://www.sharejs.com/codes/python/8032Import DateTime # Get a date Objecttoday = Datetime.date.today () # General functions print ' year:%d '% Today.yearprint ' M Onth:%d "% today.monthprint" day:%d "% today.dayprint" Weekday:%d "% today.weekday (

Python Django Debugging >>> class person (models. Model): ... First_Name = models. Charfield (max_length = ...) Last_Name = models. Charfield (max_length = ...) def __unicode__ (self): ... return u '%s '% (Self.first_name,

Python study NOTE 4: lambda expressions and switch, pythonlambdaI. Definition lambda arg1,arg2... : returnValueIi. Example #!/usr/bin/pythondef f(x,y): return x*yprint f(2,3)#6g = lambda x,y:x*yprint g(2,3)#63. An implementation scheme of switch #

Python study NOTE 2: Process Control and python study note Process1. if else: #!/usr/bin/pythonx = int(raw_input('please input:'))if x >= 90: if x >= 95: print 'a+' else: print 'a'elif x >= 80: if x >= 85: print 'b+'