python：串联列表中的列表字符串

Question

Is it possible to take each separate string from each list and combine it into one string, then have a list of strings? Instead of a list of strings within a list?

names = ['red', 'barn'], ['barn'], ['front', 'porch'], ['white', 'farm', 'house']]

Expected output below:

names = ['red barn', 'barn', 'front porch', 'white farm house']

Here is what I have tried

for name in names: names = " ".join(name) print(names) the output of this code is

white farm house

Why does this only concatenate the last element in the list?

Answer 1

You are overwriting names each loop, hence the last value of names is 'white farm house'.

Try this instead:

l_out = [' '.join(x) for x in names]
print(l_out)

Output:

['red barn', 'barn', 'front porch', 'white farm house']

Or you can do it the way you're trying:

l_out = []
for name in names:
    l_out.append(' '.join(name))
print(l_out)

Output:

['red barn', 'barn', 'front porch', 'white farm house']