The Concise Python Tutorial study notes

"Concise python tutorial" is a good online Python entry-level tutorial, although the version is relatively old, but the basic explanation is very powerful.

ch2– install Python: After the download installation is complete, in the system environment variable, after the path variable appends the address of the installation directory, can use the python under the cmd;

Ch3–python3, print syntax changed to print (); Python editor list; python-enabled IDE list;

The ch4– variable does not require a special variable type definition process;

ch5– arithmetic expression and priority;

ch6– control Flow, the main control statement line end with ":" End; the use of if/while/for/break/continue;

ch7– Use Def fun (A, B): To create a function, return the function value using return;

ch8–import/from...import/; Use __name__ to invoke the name of the module;

ch9– data structure, list, tuple, dictionary dictionary, sequence, string manipulation;

ch10– a Python script instance;

ch11– Defining Class * * * *

Defining a function in a class DEF * *

Initialize Class Def __init__ (self,x,y) self.x=x self.y=y

Inheriting class: Class Class2 (Class1):

When you invoke the object's method MyObject.method(arg1, arg2) , this is automatically converted by Python- MyClass.method(MyObject, arg1, arg2) -that's how it self works.

class Teacher (schoolmember):     def __init__ (self, name, age, salary):        Schoolmember. __init__ (self, name, age)         = salary        print'(Initialized Teacher:%s)' % self.name

ch12– file operation, files () is changed to open () in Python3;

The file reads the print instance line by row;

    f = File ('poem.txt')    while  True:        = f.readline ()         if # Zero length indicates EOF             Break        Print (line)    f.close ()

Ch13–try. Except. else used to handle exceptions, except to indicate exceptions, else to indicate normal conditions; Finally: Indicates that the final action, regardless of the try result, will execute finally:

Ch14–python Standard library: Use of SYS.ARGV, OS module;

Ch15–python some special methods; Assert statements;

__init__(Self,...)#This method is called before the new object is returned to use. __del__(self)#called exactly before the object is to be deleted. __str__(self)#called when we use the PRINT statement on an object or use STR (). __lt__(Self,other)#called when the less-than operator (<) is used. Similarly, there are special methods for all operators (+,>, and so on). __getitem__(Self,key)#called when using the X[key] index operator. __len__(self)#called when using the built-in Len () function on a Sequence object. 

ch16– Advanced Learning Content

The Concise Python Tutorial study notes