13 lines
294 B
Python
13 lines
294 B
Python
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def chain_insert(lst, at, item):
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while lst is not None:
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if lst[0] == at:
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lst[1] = [item, lst[1]]
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return
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else:
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lst = lst[1]
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raise ValueError(str(at) + " not found")
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chain = ['A', ['B', None]]
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chain_insert(chain, 'A', 'C')
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print chain
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