Basi Karaoke Gratis Da Scaricare Napoletane
Category:Italian musical genres
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Category:Songs about NaplesVarious electronic devices have employed different types of power supplies, including batteries and AC-DC converters. Each type has advantages and disadvantages. Generally, batteries are inexpensive and portable. However, they are not ideal for continuous operation of a device due to their limited power and short duration of operation. Therefore, when utilizing a battery, it is important to limit the power drawn so as not to shorten the battery's useful life, and in some cases it is preferable to use a battery that charges faster than it discharges. AC-DC converters are not as popular due to their high cost. For example, typical cost for a DC-DC converter is approximately $1.00, while a typical cost for a battery is approximately $0.50.
To provide a good overall solution, some designers have employed both batteries and AC-DC converters in their design. This is accomplished by employing the AC-DC converter to supply power when battery power is low, and employ batteries to supply power when AC power is available. This combined system is employed by a variety of different designs, but typically has significant power storage issues, such as short battery life, heavy batteries, and/or high cost of a battery due to a large capacity of the battery.Q:
How can I modify rows in a 2D list?
I have a list of lists like so:
[[1, 1, 1], [1, 1, 1], [1, 1, 1]]
I need to modify each row by multiplying by 2. I tried the following:
e_list[row] = e_list[row] * 2
but got this error:
'int' object is not iterable
How do I accomplish this?
A:
if your list is
L = [[1,1,1],[1,1,1],[1,1,1]]
L.extend(L * 2)
or if you have a list of lists of lists
L = [[1,1,1],[1,1,1],[1,1,1]]
L.extend(zip(*map(lambda x: x * 2, L)))
You could also use a list comprehension:
L = [[1,1,1],[1,1,1],[1,
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