Python: Lists

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Lists are:
1. Ordered collections of arbitrary objects
2. Accessed by offset
3. Variable-length, heterogeneious, and arbitrarily nestable
4. Of the category "mutable sequence"
5 Arrays of object references

Examples:
L=[] # empty list
L=[123, 'abc', 1.23, {}]
L=['Bob',40.0, ['dev', 'mgr']] # nested
L=list('spam')
L=list(range(1,5))
L
L[i:j] # slicing
len(L)
L1+L2 # concatenation,
L*3 # repeat
L.append(4)
for x in L, print(x)
3 in L
L.extend(4,5,6)
L.insert(i, x)
L.index(x)
L.count(x)
L.sort()
L.reverse()
L.copy()
L.pop(i)  #shrinking
L.remove(x)
del L
del L[i:j]
L{i:j]=[2,3,4]
:=[x**2 for x in range(5)]
list(map(ord, 'spam'))

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关键词：python lists list IST STS category sequence

More on lists:

L[:0]=[1,2,3] # empty slice, insert at front
L[len(L):] =[1,2,3] # empty slice, insert at the end

L.sort(key=str.lower, reverse=True)
sorted(L, key=str.lower, reverse=True)
sorted([x.lower() for x in L], reverse=True)

L.pop()  # erate the last element
L.pop(i) # erase the element at index i

del L[i:j] # delete the entire slice
L[1:]=[]  # also deelete