Python Basic

• Python Grammer

  • ref: https://docs.python.org/3/tutorial/

Installation

1. Python Download
   • Latest version 3.8.0
   • Be care version, because some python context can not compatible lower version.
     • for example, most platform user 2.7.x version python scrips. some partof 2.7.x version python script not work in 3.x.x version
2. Mac or Lunux
   • Most Mac or Linux have python

    >> python
    Python 2.7.10 (default, Feb  7 2017, 00:08:15) 
   

3. online python terminal
   • https://www.python.org/

Basic Grammer

1. number

>>python
>>>1+2
3
>>>1000-10
9990
>>>12345678 * 3
37037034
>>> 5000 / 3
1666

1. variable

   >>python
   >>>money = 100
   >>>pay = 10
   >>>money - pay
   90
   >>> a = 'pig'
   >>> b = 'dad'
   >>> a + b
   pigdad
   

   • string slice
   • [0:2] index 0 to 2 string slice
   • [startIndex:count]
   • [startIndex:] : start to end
   • [:count] : start to count

    >>python
    a = "abcedfg"
    >>> a[0:2]
    ab
   

2. list

    >>python
    >>>family = ['mother', 'father', 'gentleman', 'sexy lady']
    >>>len(familly)
    4
    >>>family[0]
    mother

• list slice
  • [0:2] index 0 to 2 list slice
  • [startIndex:count]
  • [startIndex:] : start to end
  • [:count] : start to count

    >>python
    a = [1, 2, 3, 4, 5]
    >>> a[0:2]
    [1, 2]
  

    3. Tuple
  

• () scope object
• Tuple look like List
• Tuple value can not be removed and modified

>>python
>>>t1 = (1, 2, 'a', 'b')