Python

Method actions for File objectsFile.close () Close fileFile.fileno () returns the descriptor of the document (file descriptor, FD, integer value)File.flush () flush the internal buffer of the fileFile.isatty () Determine if file is a class TTY

To fetch the current time, to get the timestamp of the current time, the timestamp seems to be the time between 1970 and now.Get the timestamp for the current time in the following way:Import Time Print (Time.time ())The result of the output is:1450

1, ConceptAdorner English name decorator, the function of the adorner is to add additional functionality to an existing object. In general, the adorner is actually a function, a function to wrap the function, so his parameters are modified function

Hint: Python version is 2.7,windows system1. Tuples (tuple)Tuple, similar to list, but once initialized, a tuple cannot be modified without adding, deleting, or modifying elements.1>>> colors =

Source: http://blog.csdn.net/yuxinleipp/article/details/7868924Type conversion One, type conversion function in PythonFunction descriptionint (x [, Base]) converts x to an integer (where base represents cardinality)Long (x [, Base]) converts x to a

The Python string supports a simple but powerful output format that formats the output string in several ways:1, the specified number of decimal digits for the floating-point value2, using exponential (scientific) notation to represent

1 ImportRe2 3 fromlxmlImportetree4 5 defIndent (Elem, level=0):6i ="\ n"+ level*"\ t"7 ifLen (elem):8 if notElem.textor notElem.text.strip ():9Elem.text = i +"\ t"Ten forEinchElem: OneIndent (E, level+1) A if

For the creation of the TCP server side, it is divided into the following steps: 1, creating a Socket object (socket): two parameters are    Address Family (e.g. af_inet for IPv4),Af_inet6 is Ipv6,af_unix for UNIX domain protocol cluster).  

1 ImportHashlib2 deffileMD5 (filename):3m =hashlib.md5 () #md5计算4 #m = hashlib.sha1 () #sha1计算5 #m = hashlib.sha224 () #sha224计算6 #m = hashlib.sha256 () #sha256计算7 #m = hashlib.sha384 () #sha384计算8 #m = hashlib.sha512 ()

grouping data and applying a function to each group is an important part of data analysis. After the data is ready, the usual task is to calculate the grouping statistics or generate the pivot table. GroupBy function can efficiently process data,

1.Socket Overview The two programs on the network realize the exchange of data through a two-way communication connection, one end of this connection is called a socket. Sockets are also commonly referred to as "sockets," which describe IP

Learn the clever use of reduce with a simple algorithm.Build function persistence (n), if n>9, returns 0. Otherwise, the decomposition of n, such as n=999, based on the weights of N, is decomposed to 9,9,9. Then 9*9*9=729 continues to make the above

Recently I had to perform an operation to crawl some pages from a site that needed to be logged on. It wasn't as simple as I thought, so I decided to write an auxiliary tutorial for it.In this tutorial, we will crawl a list of items from our

Exception handling for PythonFormat:Try:statement #正常代码except indexerror,e: #except可以写一个或多个 statement #处理代码错误的代码except exception,e: #except可以写一个或多个 statement #处理代码错误的代码else: # Optional Pass # When no exception occurs, it executes. Finally: #可选,

return function return functionThe Python function returns not only data types such as int, str, list, dict, but also functions.To give a chestnut: Define a function f () and let it return a function g1. def F():2. Print ' call F () .

Communicate the pipeline through this methodLog module Logging Python is available separatelyRe.split (Rules, strings, 1) are split with the first conforming rule.Random moduleConverts a number to a letter char (+) = A__INIT__: Constructs a method

The contents of the file.txt are:Http://183.xxx.xxx.54:188/my/qqq.ico::qq.exe::0::Http://183.xxx.xxx.54:186/my/ddnf.ico::d nf.exe::0::1 ImportRe2 ImportOs.path3 Importurllib.request4 ImportSocket5 6 #python read and write files7 #always remember to

Python applet 4Procedure 4: enter a day of a month to determine the day of the year? Analysis: 1. Add the number of days before each month, plus the number of days in the current month and the number of days 2. When the leap year is, January 1,

Python applet 2Procedure 2: Question: The bonus paid by an enterprise is based on the profit. If the profit (I) is less than or equal to 0.1 million yuan, the bonus can be raised by 10%; if the profit is higher than 0.1 million yuan, if the profit

Python write Level 3 menu #-*-Coding: UTF-8-*-_ author _ = 'am _ mm_NO.1 'import rememu = {"Northeast": {"Jilin Province": {"Jilin City ": ['Jilin city 1', 'Jilin city 2'], "Changchun": ['changchun 1 ', 'changchun 2'],}, "Liaoning Province":