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Introduction python
1. Development history:
2.6 Python - October 1, 2008
Python 2.6.1 - October 1, 2008
Python 2.6.6 - October 1, 2008
Python 3.0 - December 3, 2008
Python 2.7 - July 3, 2010 # the current version of the industry mainstream industrial use is still 2.7
Summary: python2.x heritage, python3.x is the present and future of the language
2.x = = ASSIC = default encoding is not supported
3.x = default encoding = UNICODE = default support Chinese
System-digit
32bit = maximum memory address space is 2 ** 32, 4GB
64bit, = 2 ** 64 but not actually support this great memory, 2 ** 4x, the largest motherboard memory supported is 100 GB
4gb == 64-bit system will not be faster than 32-bit systems? = The same
Python 2 or 3?
Installation
Interactive mode
Start - "cmd -> cd c: \ -> dir
cd = Change Directory
dir = directory view the current list of files
cd .. back to the previous directory
cd ../ .. return to the parent directory
cd .. /../ .. return to the parent directory on
cd ../../../ .. return to the upper layer of directory
Environment variable settings:
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