How to update the list so that each value in the list is converted to string?

Question

I initialized characters in a list without using quotes. I want to update every value in the list so that each element in the list is converted to string so that i can use the list.

list1=[1,2,3,A,B]
for i in range(len(list1)):
    list1[i]=str(list1[i])
print(list1)

I tried to update every element in the list by converting it to a string but even then i got the error.

Error Message: Traceback (most recent call last): File "C:/Users/hp/PycharmProjects/pythonProject/any.py", line 1, in list1 = [1,2,3,A,B] NameError: name 'A' is not defined Process finished with exit code 1

@ktalik I updated my question with an error message . Thanks for letting me know about that. — Anudeep Kosuri, Sep 12 '20 at 06:51
you can't use string without quotes. your code always throws an error as of my knowledge none of the programming languages supports this kind of task — deadshot, Sep 12 '20 at 06:52
@deadshot that's why I want to reassign the same list by converting all the values of list to string . — Anudeep Kosuri, Sep 12 '20 at 06:54
your code not even runs how do you convert? it's not possible — deadshot, Sep 12 '20 at 06:55
So `A` and `B` values aren't even defined. I think your problem is caused by fundamental lack of understanding how Python works. You cannot use a variable if it's not defined / declared yet. Please read more about that and good luck learning Python! — Konrad Talik, Sep 12 '20 at 06:59
@Ktalik I got a doubt whether this is possible or not if its possible then how can we do it. It doesn't mean I didn't have fundamental knowledge. Programming means making impossible things possible. — Anudeep Kosuri, Sep 12 '20 at 10:25

score 0 · Answer 1 · answered Sep 12 '20 at 06:33

0

Assuming that A and B are already defined in your code, You can use list comprehension :

list1 = [1,2,3,A,B]
strlist = [str(n) for n in  list1]

answered Sep 12 '20 at 06:33

Omkar76

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What error? You need to be specific. Also as said in comments `A` and `B` needs to be defined before use. – Omkar76 Sep 12 '20 at 06:42
Yes, I read your comment don't get me wrong but how to define them? – Anudeep Kosuri Sep 12 '20 at 06:46
By assigning value to variable – Omkar76 Sep 12 '20 at 06:49
if you define `A` and `B` you will never get this output `[1,2,3,'A','B']` it will convert the values of `A` and `B` to string not variable names – deadshot Sep 12 '20 at 06:59
Okk but I want to covert A to 'A'. I have tried a lot doing it in all possible ways.But I got some error while doing it. – Anudeep Kosuri Sep 12 '20 at 07:02

score 0 · Answer 2 · edited Sep 12 '20 at 06:51

0

You can't initialize characters in a list without using quotes. But you can use like..

list1 = [1,2,3,'A','B']

str_list = [str(n) for n in  list1]

print(str_list)

edited Sep 12 '20 at 06:51

deadshot

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answered Sep 12 '20 at 06:45

Vimal Mishra

1
1

score 0 · Accepted Answer · answered Sep 13 '20 at 20:11

0

Assuming all variables are unique, you can solve it with locals() method:

A = 4
B = 5
list1 = [1,2,3,A,B]

list2 = [None] * len(list1)

items = list(locals().items())

for i in range(len(list1)):
    for k,v in items:
        if v == list1[i]:
            list2[i] = k
            break
    if list2[i] is None:
        list2[i] = str(list1[i])
    
print(list2)

If not, please see this question for more information: Getting the name of a variable as a string

answered Sep 13 '20 at 20:11

Konrad Talik

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Thank you bro. Though it didn't worked for all characters it answered my question correctly. I am trying it for so many days whether it is possible or not . Really nice effort @ktalik – Anudeep Kosuri Sep 14 '20 at 07:11

How to update the list so that each value in the list is converted to string?

3 Answers3