The best way to convert python list items from string to number

Question

I have a list like this:

id=['"1',
 '"1',
 '"2',
 '"2',
 '"1',
 '"1',
 '"2',
 '"2'
]

what is the best way to convert all the item to numbers, now they are strings.Out put should like:

id=[1,
 1,
 2,
 2,
 ...
 2]

@not_speshal you are already using list comprehension, so you don't need the `map` :) — Be Chiller Too, Nov 10 '21 at 15:52

score 5 · Accepted Answer · answered Nov 10 '21 at 15:50

5

You can try:

numbers = [int(s.replace('"', '')) for s in id]
print(numbers)
# [1, 1, 2, 2, 1, 1, 2, 2]

and please don't use id as a variable name, as it's already a name used by python

answered Nov 10 '21 at 15:50

Be Chiller Too

score -3 · Answer 2 · answered Nov 10 '21 at 15:59

-3

You can also make a loop to convert every item into an integer

for i in range(len(id)):
     id[i] = int(id[i])

answered Nov 10 '21 at 15:59

Aditya Shah

1

Welcome to StackOverflow! I'm afraid executing `int('"2')` will yield a `ValueError` (there is a double quote inside the string) – Be Chiller Too Nov 10 '21 at 16:05
Since the elements in the id list contains an additional double quote, your solution will throw a "ValueError: invalid literal for int() with base 10" error. Before trying to cast to int, you should also remove the double quotes. – ihpar Nov 10 '21 at 20:16

2 Answers2