有没有更优雅的/pythonic方式来表达这种结构? [英] Is there a more elegant / pythonic way to express this construct?

问题描述

itemList = ["a","b","c","d","e","f","g","h"]
aa = "NULL"
bb = "NULL"
cc = "NULL"
for item in itemList:
    aa = bb
    bb = cc
    cc = item
    if aa == "NULL":
        continue
    print "%s_%s_%s" % (aa, bb, cc)

推荐答案

>>> ['_'.join(itemList[i:i+3]) for i in range(len(itemList)-2)]
['a_b_c', 'b_c_d', 'c_d_e', 'd_e_f', 'e_f_g', 'f_g_h']

或者如果您坚持打印:

>>> for i in range(len(itemList)-2):
    print('_'.join(itemList[i:i+3]))

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