Python: how to dynamically add a number to the end of the name of a list

Question

In python I am appending elements to a list. The element name I am getting from an input file, so the element_name is an unknown. I would like to create a new list by adding a number to the end of the original list (dyn_list1) or even by using one of the elements in the list (element_name). How can this be achieved?

dyn_list = []
for i in range(4):
    dyn_list.append(element_name)

I thought it would look something like:

dyn_list = []
for i in range(4):
     dyn_list%i.append(element_name)
 print(dyn_list)

But that obviously doesn’t work.

To try to be clearer, what I am ultimately trying to do is create a dynamically named list, with a list name that I didn’t have to explicitly define in advance.

Update:
This is not perfect, but it gets close to accomplishing what I want it to:

            for i in range(4):
                dyn_list.append(element_name)
                globals()[f"dyn_list{i}"] = dyn_list
            print("dyn_list %s" %dyn_list)
            print("Dyn_list1 %s" %dyn_list1)

Asked By: Shōgun8

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Source

Answer 1

I’m not sure I understand correctly, but I think you want to add the data you get by reading a txt file or something like that at the end of your list. I’m answering this assuming. I hope it helps.

list_ = ["ethereum", "is", "future"]  #your list
new_list = []                         #declare your new list
list_len = len(list_)                 #get list len
with open('dynamic.txt') as f:        #read your file for dynamic string

    lines = f.readlines()


while list_len:   # so that the dynamic data does not exceed the length of the list

    for i in range(list_len):
        new_element = list_[i] + "." + str(lines[i])
        new_list.append(new_element)
        list_len -= 1  #Decrease to finish the while loop

for p in new_list: print(p)

Answered By: emirongrr

Answer 2

You may want to use a dictionary instead of a list. You could use something like

dyn_list = {}
for i in range(4) : 
    element_name = ...#some code to get element_name
    dyn_list[i] = element_name

Then if you want to retrieve the ith element, you can use

dyn_list[i]

Answered By: Patrick_N

Answer 3

my_list = ["something"]

g = globals()
for i in range(1, 5):
         g['dynamiclist_{0}'.format(i)] = my_list

print(dynamiclist_1)
print(dynamiclist_2)
print(dynamiclist_3)
print(dynamiclist_4)

something like that ?

Answered By: emirongrr

Python: how to dynamically add a number to the end of the name of a list

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