I have 2 list in python, list1 and list2, i need to access this list in loop one by one, how can do we do it dynamically?

Answer 1

This sounds like something you'd usually use an array (or a list) for.

for i in range(5):
mylist[i] = [1, 2, 3]

If you can't or don't want to use a list of lists, you can use eval() or exec(), depending on what you want to do:

for i in range(5):
exec('mylist' + str(i) + ' = [1,2,3]')

for i in range(5):
print(eval('mylist' + str(i)))

# output:
[1,2,3]
[1,2,3]
...

Answer 2

Lets say that you have a 2-dimentional array, you typically use nested loops.

EX :

a = [[1, 2, 3, 4], [5, 6], [7, 8, 9]]
for i in range(len(a)):
for j in range(len(a[i])):
print(a[i][j], end=' ')

#OUTPUT : 1 2 3 4 5 6 7 8 9

so The first loop iterates through the row number, the second loop runs through the elements inside of a row.

Answer 3

to run through the list use a for loop:

for element in list1:
# do something

for element in list2:
# do something

Answer 4

One way would be to have a dictionary of all your lists, like:

d={0: list0, 1: list1...)

Then you can access the lists in your loop via d[i], d[i][3], d[i].append and so on.

Answer 5

What exactly do you want to do?

Answer 6

Each list name is a concatenation of "list" + number, each time I want to access a single list whose name will be "list" + STR(i)