codecademy python review

Review 6 sessions (December 3)2.5/2.6 module Use2.7 Object-oriented introductionProperties of Class 2.8Method of Class 2.9Built-in Methods for class 3.0Inheritance of the 3.1/3.2 classNotes:Module:Modules are the basic way to organize your code in Python.A python script can run on its own, or it can be imported into another script, which we call a module when the script is imported to run.All. py files can

([parameter list])//CallParameters of the functionFormal parameters and actual parameters-When defining a function, the name of the variable in parentheses after the function name is called a "formal parameter," or "formal argument"-When calling a function, the name of the variable in parentheses after the function name is called "actual parameter", or "argument"Default parameter (default parameter)def fun (x, y=100):Print x, yFun ($)Fun (1)Variables of the functionLocal variables and global va

Review Python string knowledge points and python string knowledge points String It is very easy to create a String object in Python. You only need to put the required text in a pair of quotation marks to create a new string (see Listing 1 ). If you think about it, you may be confused. After all, there are two types of

The fifth day of python (Review data types), python Data Types Supplement the Data Types of previous days1. Integer intA. Several input methodsA = 123A = int (123)When we input a = 123 on the device, the Python actually converts it to int (123 ), the following brackets are actually called _ init _ inside

Python review path-Day01, python path-day011. Number 2 is an integer example.A long integer is a larger integer.3.23 and 52.3E-4 are floating point numbers. E indicates the power of 10. Here, 52.3E-4 indicates 52.3*10-4.(-5 + 4j) and (2.3-4.4.7) are examples of plural numbers. Where-5 and 4 are real numbers, j is virtual numbers, and what is the plural in mathema

1, the realization of 1-100 of all and# method 1:sum = 0 for I in range (1,101): sum + = i print (sum) # method 2:num1 = Int (input (' Enter starting number ')) num2 = Int (input (' please lose ) sum = (NUM1 + num2) * NUM2/2 print (int (sum))2, achieve 1-500 of all odd andsum = 0for i in range (1,501): _,result = Divmod (i,2) If not result: sum + = i print (sum)3, the realization of 1!+2!+3!+4!... +20! resultssum = 0result = 0for i in range (1,21): If i = = 1: sum

scalability. You can customize your functionality by using signals, a well-designed API (middleware, extensions, pipelines).The built-in middleware and extensions provide support for the following features:Cookies and session ProcessingHTTP compressionHTTP AuthenticationHTTP CachingUser-agent SimulationRobots.txtCrawl depth LimitAutomatic detection and robust encoding support are provided for non-standard or incorrect coding claims in the English language.Supports the creation of crawlers based

resources) from the crawled data.High scalability. You can use theSignals, designed API (middleware, extensions, pipelines) to customize the implementation of your functionality.built -inMiddlewareand extensions provide support for the following features:Cookies and session ProcessingHTTP compressionHTTP AuthenticationHTTP CachingUser-agent SimulationRobots.txtCrawl Depth Limitfor non-standard or incorrect code declarations in the English language, providing automatic detection and robust encod

Review the if statement in Python and learn pythonif Basic statement Structure Copy codeThe Code is as follows:If condition 1:Execute Statement 1 ......Elif judgment condition 2:Execute Statement 2 ......Elif judgment Condition 3:Execute Statement 3 ......Else:Execute Statement 4 ...... The following execution statement is executed only when the value of "judgment condition" is True. In

first, but doing nothing) In exception handling, it is possible to pass directly to an exception that has little impact 10. Again the Else statementIn Python, in addition to using else in a conditional statement, you can also use the Else statement in the while and for loops. When used in a loop, the ELSE clause executes only after the loop completes, that is, if a break statement exists in the loop, the Else statement is skipped.For

File type: the.py python源文件 由python解释器执行.pyc python源码编译后生成的文件（字节代码）编译方法： 源码文件中使用py_compile模块 import py_compile py_complie.compile(‘***.py‘) .pyo python源码优化编译后后文件 python -O -m compile ***.py (无需要源码中使用 compile模块) -O 表示优化 -m 表示模块

an undeclared variable, or a variable that does not exist in the namespace >>> xpleaftraceback (mostrecentcalllast):file " zerodivisionerror divisor is zero >>>1/0traceback (most recentcalllast):file " syntaxerror python interpreter syntax error Span style= "FONT-SIZE:14PX;" > (the only exception that is not at run time, which occurs at compile time, the

can use the features it contains, print (SYS.ARGV) #argv, to receive all of the interpreter'sparameter, type is a list, after use, in the editor to enter a random number, will be added to it inside PYc file, byte code: If there is a pyc file, delete the py file, the program can also execute, because it is the PY compiled bytecode, priority will find it, if it is changed, it will be new to the PY compiler Address pool cache: Reduce memory burden, enhance efficiency fractional sub-pool, 5 to 257

Test environment: python2.7 + beautifulsoup4.4.1 + selenium2.48.0Test URL: http://tieba.baidu.com/p/2827883128The goal is to download all the images under this page, a total of 160 + sheets. Can be divided into the following steps:1. Get the source code of the webpage.Found directly through URLLIB2 or request to obtain the source code and the actual picture does not correspond, through the chrome review element function can query the corresponding pic