Python Quick Start

(1) Program output: Using the print statement, you can print the content directly or print the value of the variable, instance

(2) Program input: Use the Raw_input () built-in function to read the standard input and assign a value to the specified variable, instance

(3) Note: Python uses ' # ' to mark comments, beginning with ' # ' until the end of the line is a comment, such as print ' Hello ' # another comment, results only print out the Hello

(4) Operator: +-*///% * * < <= > >= = = = <> and Or not Instance

(5) Variable: Assigning a value to a variable name, such as counter = 12, means assigning 12 to a variable of counter

(6) Data type: Includes value, string, list, tuple, dictionary

(7) Code blocks and indents: code blocks are indented to express code logic, typically using 4 spaces to indent

(8) Process Control statement: if and for

(9) List resolution: List resolution You can use a for loop in a row to put all the values into a list, instance

(10) File: Python Opens the file with open (), can be specified as read-only (R), write (W), append (a) Three ways to open, such as handle = Open (file_name, Access_mode = ' R '), if Open () succeeds, A file object handle is returned, and subsequent operations on the file must be done through a file handle, such as accessing the file with the read (), ReadLines () method, and closing the file with the close () method.

(11) Errors and Exceptions: Handling exceptions with the try-except statement, when executing a python statement error, the Python interpreter throws an exception and displays the details of the exception.

(12) Function: A function is a statement group that completes a particular function, and defines the format of the function as "def Function name ():", calling the function "function name ()"

(13) Class: Classes combine the required variables and functions, which are called "encapsulation," which defines a class as the process of encapsulation, and defines the class format as "Class name ():"

(14) Module: A module can perform a specific function, a Python script can be referred to as a module, import the module with an import

(15) Package: Python modules can be organized as a package, which is a collection of modules

Python Quick Start