Python Joining multiple lists inside a list variable

Question

Note: I would want j = [] to remain inside the loop Example：

x = ['Page1.pdf','Page2.pdf']
for i in x:
    s = i
    j = []
    j.append(s)
    print(j)
    

My output from print(j):

['Page1.pdf']
['Page2.pdf']

Expected Output from print(j):

['Page1.pdf','Page2.pdf']

Answer 1

You have a list of lists of strings, which you want to convert to a simple list of strings. You can do that this way:

x = [['john'],['mary']]
x = [item for sublist in x for item in sublist]

After that, x is ['john', 'mary'], so you can do what you did:

for i in x:
    print(i)

Answer 2

import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))

From join list of lists in python [duplicate]

Answer 3

You can use list comprehension in the following way:

print([i for names in x for i in names])