Python

Insert Sort principle: It works by constructing an ordered sequence, for unsorted data, from a backward forward scan in a sorted sequence, to find the appropriate position and insert it.Insert Sort Core: Assume that the first element is lined up,

The Python Maketrans () method is used to create a conversion table of character mappings, for the simplest invocation of two parameters, the first argument is a string that represents the character that needs to be converted, and the second

Note: Root privileges are requiredTo view the Python version:Python--version1. Download Python-2.7.12wget https://www.python.org/ftp/python/2.7.12/Python-2.7.12.tgz2. UnzipTar zxvf python-2.7.12.tgz3. Change the working directoryCD Python-2.7.124.

Tag: otherwise return = = Bin Arch BSP Middle find backAssume that there are n≥1 different integers that have been stored in the order from small to large in the array element a[0], ..., a[n-1]. What we need to do is to determine if the integer x is

1, int integerThe short integer is 2**30--2**39 in the windowLong integer typeDo not distinguish between lengths in Python2, floating point floatIt's usually a decimal.3. plural4. Boolen type (Boolean type)The result or condition of the operation is

Python-Join () Pythonjoinos The moon seems to be at that time. TotalIn Python, there are two join methods, one is Str.join () and the other is Os.path.join (), which only understands the previous Str.join (iterable)

A list of lists.L = [' aaa ', ' BBB ', 89]A list is an ordered set of mathematical meanings, that is, the elements in the list are arranged in order.Check:How do I get the nth data from a list? The method is to get the specified element in the list

A collection is an unordered, non-repeating combination of data, and its main functions are as follows: Go to the weight, turn a list into a set, and then automatically go heavy. Relationship test, test the intersection of two sets of

The module in Python, the concept and the use of the following main points to note:(1)when import xx, the code in this XX module will be executed once (and executed only once):For example:(2) module package :(3) importing can import objects from

1 By default, Python 3 source files are encoded in UTF-8, and all strings are Unicode strings.2 Single-line comments in Python begin with #, and multiline comments enclose comments in three single quotation marks ("") or three double quotation marks

As shown, the compilation of Python has been performed as follows:Before executing a. py file, lexical analysis and parsing are performed first in memory by the Python interpreter. After lexical analysis and parsing are passed, the. py file is

Define a function with a def statement.function return value with return.If there is no return, the result of the function return is NoneTwo, the Python function returns multiple values.Essence: The function returns a value that is still a tuple.

1. Simple Socket Communication1.1. Service SideImport socket# buy mobile phone = Socket.socket (socket.af_inet, socket. SOCK_STREAM) # Card Phone.bind ((' 127.0.0.1 ', 8080) # boot Phone.listen (5) # Wait for the phone link print (' Server start ...

#转义字符#转义字符就是让一个有意义的字符变得无意义或无意义变得有意义;#将有意义的字符变得没有意义Home = ' 27\ ' 28\ 'Print (Home,type (home))#将无意义的n变为有意义的换行操作Home = ' My home is on the Songhua River in the northeast, 'Print (Home)#其他的转义字符#\\ represents a character \#\r indicates return to the

A package is a way to organize the namespace of a Python module by using the module name.Whether it is an import or a from...import form, it is necessary to realize--this is a package--when you encounter a dot in an imported statement (not in use).A

Class Foo: def __getitem__ (self, item): print (' =====>get ') return Self.__dict__[item] def __ Setitem__ (self, Key, value): Self.__dict__[key] = value # setattr (self,key,value) def __delitem__ (self, Key):

Using a dictionary in Python to emulate a class, here's a simple exampledefNewclass (* *Kwargs):"""using the Kwargs Update () method to handle inheritance issues""" defset (key, value): Kwargs[key]=value kwargs['Set'] =SetreturnKwargsdefMammal (*

Several methods of iterative output (index, value) in Python, pythonvalue The requirements are as follows: index and value of the iterative output sequence ). 1. Create a test list: >>> Lst = [1, 2, 3, 4, 5] 2. the implementation method is as

Blog Application Project (detailed operations), blog details 1. cookie and sessionCookie can work independentlyCookie can also be used with sessionEach browser has a cookie :{}When the browser first accesses the server, the cookie is empty.The

Object-oriented 5-reflection, object-oriented 5-Hasattr (x, y) getattr (x, y) setattr (x, y, v) delattr (x, y) reflection method is to reflect the string as the memory address. 1 class people (object): 2 def _ init _ (self, name, age): 3 self. name =