Python variable, code base day-1

1. Version differences

Python code--bytecode--machine--Computer
PyPy code-to-machine code--Computer
CPython is the official version of Python

#!/usr/bin/env python
#-*-Coding:utf-8-*-

The. pyc file is a byte-code file, which is equivalent to a caching mechanism

2. Variables

1. A variable refers to something

2. Composed of numbers, underscores, letters (note: Cannot start with a number)

3. Cycle

1.if, after else,elif2017-07-15 condition must remember add:

2.while cyclic generation conditions will always be met. Break can force the loop to jump out, continue means exiting the loop and entering the next loop.

4. Encoding

1.UTF-8,GBK is the simplification of the universal code

2. If you want to convert Utf-8 to GBK, you need to convert to Unicode first.

If A is utf-8, convert it to GBK:

A = A.decode ('utf-8'# decoding needs to specify what type of encoding is originally a = A.encode ('GBK  ')   # encoding needs to specify what type of encoding you want to turn into

Python variable, code base day-1