Python environment configuration:
first step:
Step Two: Click the image above: Python 3.6.4 version, download
The third step: pay attention to the red arrow where you want to hook on, then click on the install now, to start the installation
Step Four: Start -> Search: idle came out
Python programming two ways:
Interactive: real-time operating results for each input sentence for grammar exercises
File type: bulk execute a set of statements and operating results, the main way of programming
Elemental analysis syntax:
Indent: Expression and hierarchy between code contains the only means, generally with a length of four spaces, or a TAB
Note: single-line comments: # at the beginning, followed by the comment content; multiline comments: In '' 'at the beginning and end
Name: identifier associated with the process
Naming rules: uppercase and lowercase characters and a combination of letters, numbers, underscores and Chinese characters; case sensitive, the first letter can not be a number, not the same as a reserved word
Reserved words: is defined within the programming language used and reserved identifier, Python reserved word 33
type of data:
String: an ordered sequence of characters of zero or more characters; represented by a pair of single or double quotes
Number of strings: forward and reverse declining numbers incrementing number
Use [] to obtain characters in one or more characters
Index: Returns a single character string <string> [M]
Example: "Please enter the temperature value with a negative sign:" [0] or TempStr [-1]
Slice: Returns a string in a string substring <string> [M: N]
Example: "Please enter the temperature value with a negative sign:" [1: 3] or TempStr [0: -1]
Type list: an ordered sequence of zero or more data consisting of a list of the [], a comma (,) between each element
Example: [ 'F', 'f'] denotes two elements 'F' and 'f'
Python input and output
Input Function: input function obtains user input from a console using the format: <variable> = input (<message string>), the user input information stored in the character string type <variable> in.
输出函数：print（） 以字符形式向控制台输出结果的函数；
评估函数：eval（） ：去掉参数最外侧引号并执行余下语句的函数
