Python

First, exception handling1. What is exception handlingThe Python interpreter detects an error, triggers an exception, and the programmer writes specific code specifically to catch the exception.If a successful capture goes into a processing branch

1.Script Example:Execution Result:2.Script Example:Execution Result:The order of execution can be seen from the above:The following conclusions can be drawn broadly:1) The order of the tests is generally carried out in the order of the modules-----2)

A string is an ordered collection of Python, and the sequence contains a left-to-right order-the elements in the sequence are stored and read according to their relative positions.Operation of the string:>>>s = ' Spam ' >>>s[0] #读取第0个字符 ' s ' >>>len

1. Inspection and judgmentIssubclass (class, ClassInfo) if the first parameter is a subclass of the second argument, return True, Note: Non-strict (oneself can be considered to be their own subclass); The second parameter can be a tuple

Reference: http://hi.baidu.com/nivrrex/blog/item/e6ccaf511d0926888d543071.htmlHttp://topic.csdn.net/u/20070404/15/b011aa83-f9b7-43b3-bbff-bfe4f653df03.htmlFirst, make sure that all encodings are Unicodesuch as Str.decode (' UTF8 ') #从utf8文本中U "Ah L"

Meaning of the Python __name__ variableif __name__ ' __main__ ' : tf.app.run ()When Python reads the program, some system variables are initialized. If the current program is the main program, the value of the __NAME__ variable is assigned a

Learn the last lesson of the first module today-function:The first function of Python:1 def func1 (): 2 Print (' first function ') 3 return 0 4 func1 ()Functions can return various data types:When multiple types are returned at the same time,

1. Manually traverse the iteratorUse the next function and captureStopIteration异常。def Manual_iter (): With open ('./test.py') as F: try : while True: = Next (f) print line except

Python has many development tools, including editors and the Integrated development environment (IDE).All I've been using is pycharm. Pycharm is a Python IDE with a complete set of tools to help users improve their efficiency when developing with

Scrapy is a fast and extensible crawler Framework for crawling Web site content developed using Python.Installation dependenciesYum install gcc gcc-c++ OpenSSL mysql mysql-server libffi* libxml* libxml2 libxml2-dev libxslt libxslt-dev

1, binary: The data stored on the hard disk are saved in binary form. A byte occupies 8 bits, consisting of 0 and 1, every 2 into 1. For example, a Chinese character "King", in the UTF-8 encoding format, the hard disk accounted for 3 bytes 24 bits,

First, the basic definition of the function1, definition of function: function is a programming method of logical structure and process12 def4 "Thefunction definitions" 5 x+=1 6 return 7 def9 test: Function name (): Inside

The nginx.conf file has the following content:Server {... .... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .... ... .... ... ..... ..... .... ..... ..... ..... ..............Server 192.168.201.131:80 weight=1;Server 192.168.201.132:80

This article mainly introduced the Python installs the Cx_oracle module frequently asked questions and the solution, has analyzed the python in the Windows platform and the Linux platform installs the Cx_oracle module frequently asked questions, the

This article mainly describes the python in the sqlalchemy sort of a pit, the text gives a detailed sample code, the need for friends can reference, interested friends to learn from the following together. Objective SQLAlchemy is an ORM framework

Here is a small series to bring you a Python link and operation Memcache method. Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting. 1. Open the Memcached

Several methods for creating dictionaries in Python (recommended) and several python Methods 1. Traditional text expressions: >>> d={'name':'Allen','age':21,'gender':'male'}>>> d{'age': 21, 'name': 'Allen', 'gender': 'male'} This method is very

Python implements encryption and decryption of strings. This document describes how to encrypt and decrypt strings in Python. We will share this with you for your reference. The details are as follows: The requirement is that the password should be

Pycharm tutorial (1) custom appearance and pycharm appearance As a powerful Python IDE, Pycharm has never found a complete reference manual. Therefore, it is decided to briefly translate the Pycharm tutorial on the official website and share it with

[Switch] eval () function usage, eval function usage Eval Function: Evaluate a string 'str' as a valid expression and return the calculation result. Syntax: eval (source [, globals [, locals])-> value Parameters: Source: Code object returned by a