Python

Copy codeThe Code is as follows:Import zipfileImport StringIO Class InMemoryZip (object ):Def _ init _ (self ):# Create the in-memory file-like objectSelf. in_memory_zip = StringIO. StringIO () Def append (self, filename_in_zip, file_contents

Remote Call makes the method of calling remote server objects and methods similar to that of calling local objects and methods, because we have hidden them through network programming. Remote Call is the basis of a distributed system. There are two

SQLAlchemy's philosophy is that the magnitude and performance of SQL databases are important to object sets, while the abstraction of object sets is important to tables and rows.1. Install SQLAlchemyCopy codeThe Code is as follows: pip install

1. Obtain the depth of a binary treeIs the last level of the Binary Tree, such: Implementation Code:Copy codeThe Code is as follows:Def getheight (self ):'''Retrieve Binary Tree extension '''Return self. _ get_tree_height (self. root)Def _

I have talked about a multi-thread blog before, and I feel that I am not doing anything about it. In fact, multithreading is very interesting. Because we are using multiple processes and threads all the time while using computers. We can continue

All standard sequence operations apply to strings, but strings are immutable. Character % is used for string formatting: Put a string on the left side of %, and put the value to be formatted on the right side. You can use one value or the tuples or

Copy codeThe Code is as follows:#! /Usr/bin/env pythonImport sys, timeFrom socket import socketDef read_interface (in_file ):With file (in_file) as f:Return f. readlines () [2:]Def set_interface (inter_msg ):Dic = {}For I in xrange (len (inter_msg ))

Table is created using the following statement:Copy codeThe Code is as follows: create table userinfo (name text, email text) Insert data faster Here we use time. clock () for timing and look at the speed of the following three methods.Copy codeThe

Note: The Python 2.7 is used. A simple implementationCopy codeThe Code is as follows:Class Foo (object ):_ Instance = NoneDef _ init _ (self ):Pass@ ClassmethodDef getinstance (cls ):If (cls. _ instance = None ):Cls. _ instance = Foo ()Return cls. _

As follows: Figure 1 (the Avatar is cropped in a circular shape, and the others are transparent) Figure 2 (add an ellipse to the four corners of the image) I have never handled it before. It is a little laborious to handle it. Modules used:Copy

Mainly: pre-order traversal, mid-order traversal, post-order traversal, hierarchical traversal, non-recursive pre-order traversal, non-recursive mid-order traversal, non-recursive post-order traversal Copy codeThe Code is as follows:#! /Usr/bin/env

After php5.2 was upgraded to 5.3, the original & new method has been abandoned. Now you can use new directly. In the face of hundreds of PHP files, manual modification is almost fatal, so I wrote a script, in minutes. Copy codeThe Code is as

Before you begin, you must first describe these points: 1. in Python, there are usually nine elements in the format of time: 1) timestamp 2) formatted time string 3) tuples (struct_time. Since the time module of Python mainly calls the C library,

Copy codeThe Code is as follows:Def sa_obj_to_dict (obj, filtrate = None, rename = None ):"""Convert sqlalchemy object to dict: Param filtrate: filtered Field: Type filtrate: list or tuple: Param rename: name to be renamed. The name is processed

Text files in the following formatCopy codeThe Code is as follows:/"/Please /! /"/"/Please /! /"/Two/swordsmen/respective/reverse//,/right hand/Grip/hilt /,/Left hand/Attach/right hand/,/bow /. /Two/person/body/not yet/station/straight

The document "talking about Python GIL" misses a very important function and does not discuss sys. setcheckinterval. This function is used to set the interval for GIL automatic switching. The default value is 100. The previous test results are

Python is indeed a good language. There is no doubt that Python has always been known for its simplicity, convenience, and strength. It is easy to use and easy to use. The standard library and PyPI third-party library have abundant and useful

Yesterday I wrote an article about Python extension using C language. Today I optimized the relevant code and posted the latest code here. # Include PyObject * PyObject ** self, PyObject ***(! PyArg_ParseTuple (args, & = (res! = Py_BuildValue

3.5 dictionary Another data type defined in python is dictionary. In other languages, dictionaries may be defined as "Composite memories" or "Composite arrays ". Unlike sequences that can be indexed by numbers, it is a constant type of keyword keys

Chapter 4 If you exit the python interpreter and re-enter, the methods and variables you have defined will disappear. Therefore, if you want to write a long program, you 'd better use a text editor to prepare input for the interpreter and run the