lst = ['python', 'java', 'php', 'swift', 'c++', 'c', 'c#', 'javascript', 'nodejs']
N = 2
lst = [lst[index:index + N] for index in range(0, len(lst), N)]
print(lst)
'''
run:
[['python', 'java'], ['php', 'swift'], ['c++', 'c'], ['c#', 'javascript'], ['nodejs']]
'''