How to append data inside the first list into the second list-CodePudding

How to append data inside the first list into the second list and eliminate newline for data in y. For example, y = ['2\n'] x = ['22 34 55 \n']

expected output : output = [' 2 22 34 55 \n']

I have tried .join syntax but i didnt get the output as I expected.

CodePudding user response：

If you are trying to merge two lists into one you can use Mechanic pig's method:

y = ["2"]
x = ["22", "34", "55"]

z = y   x

# y and x will remain ["2"] and ["22", "34", "55"]
# z will be ["2", "22", "34", "55"]

If you are trying to append values to a list you can use the list.extend method:

y = ["2"]
x = ["22", "34", "55"]

y.extend(x)

# x will remain ["22", "34", "55"]
# y will become ["2", "22", "34", "55"]

Or if you want to prepend a list to a list insert the elements of list y from back to front into x:

y = ["2"]
x = ["22", "34", "55"]

for element in y[::-1]:
    x.insert(0, element)

# x will become ["2", "22", "34", "55"]
# y will remain ["2"]

CodePudding user response：

We can use the extend() method and combine both the lists.

We can also use a lambda function to iterate the list x, and append the item as shown.

I have attached the code below.

y=[2]
x=[22, 34, 55]

y.extend(x)
print(y) # prints [2, 22, 34, 55]

y=[2]
y.extend([i for i in x])
print(y) # prints [2, 22, 34, 55]