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  • Day1:The basic of Python

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    一、The development of Python

         1、Two types of program:

             Type 1:Python,Java,PHP,C#,Go,ruby,C++…… >>>byte code

             Type 2: C,assembler  >>>machine code

          2、Comparison between the frequencyly used language

              PHP: suitable for website,have limitations

              Python,Java: be suitable for website and background program

                   ---Python :high execution,low development 

                   ---Java :high development,low execution

               Cause Python is more easier to compile than Java

     二、The type of Python

           Jpython,Ironpython,CPython(commonly used),JavaScript Python,Rubypython

           Pypy:developed by Cpython

    三、The basic use of Python

          1、the suffix:

              The suffix is not limited but if without  '.py'  will lead some failure.  

          2、Two executive method:

              (1)、.py route 

            (2)、In the explain device :insert real time and get the real implement results

          3、explain the device route: #!/use/bin/env Python

          4、Python 2 coding: # -*- coding:utf8 -*-

              Eg:AscII 8bits(not enough)  unicode 16bits(a waste of bits); 

              Utf-8 :Can distribute the bytes according to the situation      

          5、execute an operation

               Print: wait until input value and then replace the values

               1) Remind the user input username and password

               2) Insert the username and password

               3)Check

               4)correct:log in;wrong:log failure

          6、Variable :word+number+underline

               1) number can't be the head and don't conclude key words such as:'as','and','from','except','for','exec','del'…

               2) quotation marks:"";'':must be a pair

               3) The algorithm of string: plus and multiple

               Supplement : the algorithm of number:+、_、*、/、%、** 、//

          7、if sentence 

              1) Compared with C :①the strict use of TAB key.②no use of() and {}in some cases

              2) if elif elif else

              3) the use of pass

          8、while sentence

              1) dead circulation :while 1==1

              2) conditional while

          Supplement:

              1) while else

              2) Continue: terminate the current circle and start the next round

                  Break:terminate the whole circle

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  • 原文地址:https://www.cnblogs.com/zxver/p/11924555.html
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