如何在python列表中的特定索引处插入元素

Question

I am creating a list whose items are to be mapped by index number. I tried using the list.insert() method. But still it always adds the first element to 0th index and I want the first element at 1st index. For example:

somelist=[]
somelist.insert(1,"Jack")
somelist.insert(2,"Nick")
somelist.insert(3,"Daniel")

>>print(somelist[1])
Nick # not Jack

how can I do this in Python? where I can insert element only at given index and let the list start from index 1.

Answer 1

When you insert something into a empty list, it will always be starting from the first position. Do something like this as workaround:

somelist=[]
somelist.insert(0,"dummy")
somelist.insert(1,"Jack")
somelist.insert(2,"Nick")
somelist.insert(3,"Daniel")

#print(somelist[1])
print(somelist[1])

output:

Jack

Answer 2

Your somelist array is empty, which means you can't add an item to the index 1 if there is no item in index 0..

With this i mean when you first try to insert "Jack" to index 1, it goes automatically to index 0, and then you insert "Nick" to index 2, and that goes to index 1... and last you print index 1 which is "Nick"

Answer 3

I think a dictionary could be helpful here if that will do.

Like

d={}

and insertion at required places is as easy as

d[1]="Jack"
d[2]="Nick"
d[3]="Daniel"

Now

print( d[1] )

will print

Jack

This way you won't have to use dummy values.