I've got trouble reverting below one line loop to multiple lines loop. here is the original code:
sequences = [[[item.strip() for item in itemset.split(",")] for itemset in sequence] for sequence in sequences]
Multiple line loop that I tried:
for sequence in sequences:
for itemset in sequence:
for item in itemset.split(","):
sequences.append(item.strip())
It does not work as the original one. Any idea?
Your original question reassigns the result with the same name of the data (sequences). Here, I assign the result to the variable result.
Given that you did not provide sample data, I just made some up (sequences).
Your original list comprehension is nested (note the brackets), with each layer creating a separate list.
[[[x.strip() for x in something] for something in something_else] for something_else in sequences].
I've recreated that structure by creating a new list with each for-loop, appending as it goes along to match the original list comprehension.
# Sample data.
sequences = [['the, quick, brown fox'], ['jumped, over, the lazy dog']]
# Solution.
result = []
for sequence in sequences:
inner_list = list()
result.append(inner_list)
for itemset in sequence:
inner_list_2 = list()
inner_list.append(inner_list_2)
for item in itemset.split(","):
inner_list_2.append(item.strip())
>>> result
[[['the', 'quick', 'brown fox']], [['jumped', 'over', 'the lazy dog']]]
# Original list comprehension.
>>> [[[item.strip() for item in itemset.split(",")]
for itemset in sequence]
for sequence in sequences]
[[['the', 'quick', 'brown fox']], [['jumped', 'over', 'the lazy dog']]]
[[['the', 'quick', 'brown fox']], [['jumped', 'over', 'the lazy dog']]] You need another array.
[['the', 'quick', 'brown fox'], ['jumped', 'over', 'the lazy dog']], which was missing one level of nesting and therefore did not match the answer you get from the list comprehension you provided.
sequences, create another empty list and append to it every loop