How can you use a `for` loop to change the content of a list?-CodePudding

For example:

my_list = [x for x in range(10)]
for i in my_list:
    i  = 1
print(my_list)

This code will print a list containing numbers between 0 - 9. But I want if I change i, the actual value in my_list will change too. So for the example, I want it to print between 1 - 10.

I can do:

my_list = [x for x in range(10)]
for i in range(len(my_list)):
    my_list[i]  = 1
print(my_list)

but I heard that this kind of for loop when you use len() is bad. So is there any other way?

I know that i is not a reference, but I want to make it like one.

CodePudding user response：

You can use only one list comprehension instead of using two loops:

my_list = [x 1 for x in range(10)]

Output:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

CodePudding user response：

You can use a list comprehension:

my_list = [x   1 for x in range(10)]

# or:

my_list = [x for x in range(10)]
my_list = [x   1 for x in my_list]

In your first loop, i is just a name, it's not a reference to the list in any way.