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File "<stdin>", line 4
return [i, s for i, s in zip(old, separators)][:-1]
^
SyntaxError: invalid syntax
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def insert_separator(old, sep):
items_count = len(old)
separators = (sep for _ in range(items_count))
result = []
for i, s in zip(old, separators):
result.append(i)
result.append(s)
return result[:-1]
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def foo(lst, sep):
res = []
for i in lst:
res += [i, sep]
return res[:-1]