


Program output needs to achieve the following effects:
[1] [1,1] [1,2,1] [1,3,3,1]
......
Method: iteration, generator
def triangles() L = [1] while True: yiled L L =[1] + [L[i] + L[I+1] for i in range(len(L)-1)] + [1] n = 0 for t in triangles(): print(t) n += 1 if n == 10: break
Implementation logic:
1. Since yield is the generator interrupt output, the first output is [1]
2. Continue the loop after yield under while. At this time, the list length is 1, substitute it len(L) in L, the result is [L[i]+L[i+1] for i in range(1-1)], which is a null value, so the output of yield L is [1,1]
3. At this time, the value of len(L) is 2, and substitution results in [L[i]+L[i+1] for i in range(2-1)] as [L[i]+L[ i+1] for i in range(1)], i can take the value 0, and after substitution, it is [L[0]+L[1]], and the values of L[0] and L[1] are both 1 (It can be seen from the above results), so the output result is [1,2,1]
4. From the third article, it can be seen that the value of len(L) is 3 at this time, and substitution gives [L[i]+ L[i+1] for i in range(2)], the value of i is 0 and 1, and there are two values output through the loop, both are 3, respectively represented by [L[0]+L[1]],[ L[1]+L[2]]
The above is the detailed content of An example introduction to Yang Hui's triangle method in Python. For more information, please follow other related articles on the PHP Chinese website!

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