The path of Python development (i)

One, the history of Python

"Uncle Turtle" uses the C language, the use of a holiday written in high-level language.

Language divided into: compiled interpretation type

C Python

Two, the Python version

PYTHON2X and python3x

Manufacturers will update to 2020 continuous update (the following source code is basically the PYTHON3X interpreter mainly)

Three, easy-to-use IDE tools

Pycharm, supports Windows Authoring and Linux Environment Authoring (vi).

Knowledge Points:

Four, variables and constants

1, variable is any combination of digital letter underline
2. The variable cannot be the beginning of a number
3. The variable cannot be a keyword in python
4. Variables to be descriptive
5. Variables cannot be used in Chinese
6. Variable cannot be too long

Constants are constant quantities, such as π;

And there are no constants in Python.

Five, initial code

PYTHON2X python3x

Asiic yards UTF-8

ASIIC Code: 8 bits = 1 bytes, representing one character
Universal code: Unicode contains the language of all countries
Unicode Upgrade: utf-8: A minimum of 8 bits for one byte
A: 1,000,111 bytes
European script: two bytes
Asia: Medium: three bytes
Utf-16 at least 16 bits for one character
GBK: GB.
A 1,010,101 bytes
Medium: 01010001 10,100,112 bytes represent one character

Conversion of units:
8bit = 1bytes
1024bytes=1kb
1024kb=1mb
1024mb=1gb
1024gb=1tb

VI, user interaction

Input

PYTHON2X python3x

Raw_input (str) input (str)

Input (int)

Seven, if loop

If condition:

Results

Eight, while loop

While .... : #满足该条件

。。。。。 Perform

。。。。。 Perform

Jump back while

The path of Python development (i)