Python

Three-object operator in C LanguageExpression? Expr1: expr2; // If expression is true, the value of expr1 is obtained; otherwise, the value of expr2 is obtained. Python implementation method: (1) expr = judgment Expression and expr1 or expr2

In xmlrpclib, binary data needs to be transmitted. Therefore, binary objects is used for packaging and the following two functions are written: Def encodebindata (data ):Out = stringio. stringio ()Bin = xmlrpclib. Binary ()Bin. Data = DataBin.

Comment/usr/lib/RPM/RedHat/macros/usr/lib/RPM/BRP-Python-bytecompile % __ OS _install_post \/usr/lib/RPM/RedHat/BRP-compress \ % {!? _ Debug_package: /usr/lib/RPM/RedHat/BRP-strip % {__ strip }\/ usr/lib/RPM/RedHat/BRP-strip-static-archive % {__

Find the site-packages directory in the python path used by the Zope instance, create a sitecustomize. py file in this directory, and set the corresponding permissions. The file content is as follows: Import sys SYS. setdefaultencoding ("UTF-8 ")

To others:Python has powerful scalability. I have listed 50 excellent Python modules, including almost all the needs, such as databases, guis, images, sound, OS interaction, web, and others. It is recommended to add to favorites.Graphical interface

1. _ getitem __ Original document: for instance, if a class defines a method named_ Getitem __(), AndXIs an instance of this class, thenX [I]Is roughly equivalentX. _ getitem _ (I)For old-style classes andType (x). _ getitem _ (x, I)For new-style

By default, after python is installed in windows, the system does not automatically add corresponding environment variables. In this case, you cannot directly use Python commands in the command line. 1. first, you must register the python

_ New __(CLS [,...]) This method is only used for new-style classes (classes inheriting from object ). Called to create a new instance of classCLS._ New __Is a static method (Special-cased so you need not declare it as such) that takes the class of

Seek (): Move the File Read pointer to the specified position Tell (): returns the position of the object read pointer. Three Modes of seek: (1) F. Seek (p, 0) moves the absolute position of the object at the P-byte. (2) F. Seek (P, 1) Move P bytes

Class has some special attributes, so that we can obtain some additional information. >>> Class class1 (object): "" class1 Doc. "def _ init _ (Self): Self. I = 1234 >>>> class1. _ Doc _ # type help information 'class1 Doc. '>>> class1. _ name _ #

Class has some special attributes, so that we can obtain some additional information. 1 >>> class class1 (object): 2 "class1 Doc. "3 def _ init _ (Self): 4 self. I = 1234 5 6 >>> class1. _ Doc _ # type help information 7' class1 Doc. '8 >>> class1. _

# Ensure that the system is up-to-date Sudo apt-Get updateSudo apt-Get upgrade # Install the python Tool Sudo apt-Get install PythonSudo apt-Get install Python-DevSudo apt-Get install libjpeg-DevSudo apt-Get install libfreetype6-devSudo apt-Get

The 'i2c Python library 'of think bowl provides the 'itg-100' sensor interface to conveniently obtain sensor information. # ITG-3205Here is the installation

Bisect in python is used to operate the sorting array. For example, you can insert data into an array and sort the data at the same time. The following code demonstrates how to operate: import bisectimport randomrandom.seed(1)print('New pos contents'

Python enumerate usage | counts in the For Loop The parameter can be a traversal variable, such as a string or a list. The returned value is the enumerate class: Import strings = string. ascii_lowercasee = enumerate (s) print sprint list (E)

Dict1 = {1: [111, 222], 2: [,]}Dict2 = {3: [333, 444], 4: [,]}Merge the two dictionaries to get a similar result. {1: [111, 222], 2: [333, 444], 3: [,], 4: [,]}Method 1: Dictmerged1 = dict (dict1.items () + dict2.items ())Method 2: Dictmerged2 =

This struct is mainly used to process the C structure data. It is first converted to the python string type during reading, and then to the python structured type, such as the tuple ~ Generally, the input channel comes from the binary stream of a

Coverage. py. This tool is relatively simple. I installed it with easy_install ($ Easy_install coverage), Very smooth. Because Python does not need to compile links, this tool is very easy to use.Coverage run [Options] your_cmd [cmd options].

OS. path. abspath (PATH) # returns the absolute path OS. path. basename (PATH) # returns the file name OS. path. commonprefix (list) # Return the longest paths in the list (multiple paths. OS. path. dirname (PATH) # returns the file path OS. path.

There is an interesting syntax in Python. This type becomes callable when the _ call _ function is implemented when the type is defined. In other words, we can use the object of this class as a function, which is equivalent to overloading the