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Python (Source (Book (Automate the Boring Stuff with Python https…

- - - - Read-Evaluate-Print Loop
- - - - values
        
        1,2,3,4
      - operators
        
        **
        
        Exponent
        
        2**3
        
        8
        
        %
        
        Modulus/ Remainder
        
        22%8
        
        6
        
        22-16=6
        
        //
        
        Integer division/ Floored quotient
        
        22//8
        
        2
        
        *, /, +, -
    - - Precedence
        
        the condition of being considered more important than someone or something else; priority in importance, order, or rank.
    - - Integers
        
        -2, -1, 0, 1, 2, 3, 4, 5
      - Floating-point numbers
        
        -1.25, -1.0, -0.5, 0.0, 0.5, 1.0, 1.25
      - Strings
        
        'a', 'aa', 'aaa', 'Hello!', '11 cats'
        
        String Concatenation and Replication
        
        -- >>> 'Alice' + 'Bob'
        
        'AliceBob'
        
        -- >>> 'Alice' + 42
        
        Traceback (most recent call last):
        File "<pyshell#0>", line 1, in <module>
        'Alice' + 42
        TypeError: can only concatenate str (not "int") to str
        
        -- >>> 'Alice' * 5
        
        'AliceAliceAliceAliceAlice'
        
        -- >>> 'Alice' 'Bob'
        -- >>> 'Alice' 5.0
        
        TypeError: can't multiply sequence by non-int of type 'str'
        TypeError: can't multiply sequence by non-int of type 'float'
- - - - X = [1,2,3,4]
        
        X = [1,2,3,4]
        
        '>>>' Print(x[1:2})
        [2,3]
        '>>>' x[1:2] = []
        [1,4]
        '>>>' x[0] = 99
        [99,2,3,4]
        '>>>' x = x+[7,8]
        [1,2,3,4,7,8]
        '>>>' Print(len(x)
        4
        
        data = [[1,2,3],[4,5,6]]
        
        '>>>' Print(data[0] [1])
        2
        '>>>' Print(data[1] [0:2])
        [4,5]
        '>>>' data[1] [0:1] = [5,5,5]
        [1,2,3], [5,5,5,5,,6]
    - - 集合
        
        s1 = {1,2,3,4}
        s2 = {3,4,5,6}
        
        '>>>' Print(3 in s1)
        True
        '>>>' s3 = s1&s2
        '>>>'Print(s3)
        {3,4}
        '>>>' s3 = s1|s2
        '>>>'Print(s3)
        {1,2,3,4,5,6}
        '>>>' s3 = s1-s2
        '>>>'Print(s3)
        {1,2}
        '>>>' s3 = s1-s2
        '>>>'Print(s3)
        {1,2,5,6}
        
        '>>>' s = set('World')
        {'o', 'd', 'r', 'W', 'l'}
      - dic = {'red':'apple', 'blue':'sky'}
        
        '>>>' dic = {''red} = {'Little apple'}
        '>>>' Print(dic['red'])
        Little apple
    - - X = (1,2,3,4,5)
        
        X = (1,2,3,4)
        
        '>>>' x [0] = 5
        Error