Python list

a.Method for creating a list

     1.create list
     eg.
        >>> a=["python",25,89.9]
        >>> a
        ["python",25,89.9]
     2.list index   
     eg.
        >>> a=["python",25,89.9]
        >>> a[0]
        'python'
        >>> a[1]
        25
        >>> a[2]
        89.9
        >>> a[-1]
        89.9
        #get the index in list
        >>> a.index(25)
        1
        >>> a.index(89.9)
        2
        >>> a.index("python")
        0
        >>> a.index("blog")
        Traceback (most recent call last):
          File "<pyshell#26", line 1, in <module>
             a.index("blog")
        ValueError: 'blog' is not in list

     3.list slice(sice([start],stop[,step])
     eg.     
        >>> a=["python",25,89.9]
        >>> a[0:2]
        ['python',25]
        >>> a[:1]
        ['python',25]
        >>> a[0:]
        ["python",25,89.9]
        >>> lst= [1,2,3,4,5,6]
        >>> lst[::-1]
        [6, 5, 4, 3, 2, 1]
        >>> lst[0:4]
        [1, 2, 3, 4]
        >>> lst[0:4:1]
        [1, 2, 3, 4]
        >>> lst[0:4:2]
        [1, 3]
        >>> lst[4:1:-1]
        [5, 4, 3]
        >>> list(reversed(lst))
        [6, 5, 4, 3, 2, 1]
        >>>len(lst)
        6
        >>> lst + a
        [6, 5, 4, 3, 2, 1,"python", 25, 89.9]
        >>> a * 3
        ["python", 25, 89.9, "python", 25, 89.9, "python", 25, 89.9]
        >>> max(lst)
        6
        >>> min(lst)
        1
        >>> max(a)
        'python'
        >>> min(a)
        25
        >>> cmp(a,lst)
        1

b.Common method of list

     1.append(object) -- append object to end 
        eg.
        >>> a = [1,2]
        >>> a.append(100)
        >>> a
        [1,2,100]
        >>> a.append("python")
        >>> a
        [1,2,100,'python']
        >>> a.append(["google","facebook"])
        >>> a
        [1,2,100,'python',['google','facebook']]
        >>> b = [1]
        >>> id(b)
        46824863
        >>> b.append(5)
        >>>b
        [1, 5]
        >>> id(b)
        46824863

     2.extend(iterable) -- extend list by appending elements  from the iterable
        eg.
        >>>a = [1, 2, 3]
        >>>b = [4, 5, 6]
        >>>a.extend(b)
        >>>a
        >>>[1, 2, 3, 4, 5, 6]
        >>>a.extend("python")
        >>>a
        [1, 2, 3, 4, 5, 6, 'p', 'y', 't', 'h', 'o', 'n']
        #Whether the iteration can be judged
        >>> hasattr(a,'__iter__')
        True
        >>> hasattr("python",'__iter__')
        False
        >>> hasattr(5,'__iter__')
        False

     3.count(...) integer -- return number of occurrences of value
        eg. 
        >>> a = [1,1,1,2,2,1]
        >>> a.count(1)
        4
        >>> a.count(2)
        2
        >>> a.count("a")
        0

     4.index(value, [start, [stop]]) integer -- return first index of value.     
        eg.
        >>> a = [1,1,1,2,2,1]
        >>> a.index(1)
        0
        >>> a.index(2)
        3

     5.insert(index, object) -- insert object before index
        eg.
        >>> a = ["python", "web"]
        >>> a.insert(1,"qwer")
        >>> a
        ['python', 'qwer', 'web']
        >>> a.insert(0,26066913)
        >>> a
        [26066913,'python', 'qwer', 'web']

     6.pop([index]) item -- remove and return item at index (default last)
        eg.
        >>> a = ["wiki","twitter","google","facebook"]
        >>> a.pop(1)
        'wiki'
        >>> a
        ['twitter','google','facebook']
        >>> a.pop()
        'facebook'
        >>> a
        ['twitter','google']

     7.remove(value) -- remove first occurrence of value.
        eg.
        >>> a = ['twitter','twitter','google','facebook']
        >>> a.remove("twitter")
        >>> a
        ['twitter','google','facebook']

     8.reverse() -- reverse *IN PLACE*
        eg.
        >>> a=[1,2,3,4]
        >>> a.reverse()
        >>> a
        [4, 3, 2, 1]

     9.sort(...)
        eg.
        >>> a = [5, 3, 9, 2]
        >>> a.sort()
        >>> a
        [2, 3, 5, 9]