Trying to use a variable as an index but it won't work

In Python I'm trying to make it so that 'number' points to the exact same number in the list as x (this probably sounds stupid but its a simplified version of what I'm trying to accomplish).

But, for some reason the index assumes x is still 1 instead of 2 (which it is after x += 1)

list = [0, 1, 2, 3, 4]

x = 1

number = list[x]

print(number)
x += 1

print(number)
print(x)

Anyone know what I'm doing wrong?

I'm pretty new to all of this.

I expect an output of 1 2 2 but I got 1 1 2

In this, we do increment the value of x, but the variable number still have 1 in it. We have to reassign it again to get the value 2.

Code :

listOfNumbers = [0, 1, 2, 3, 4]

value = 1

matchingNumber = listOfNumbers[value]

print(matchingNumber)
value += 1
matchingNumber = listOfNumbers[value]
print(matchingNumber)
print(value)

Output :

1
2
2

NB: Please do not use list as a variable name, because it overshadows the built-in name list.

lst = [0, 1, 2, 3, 4]  # do not use list as a variable name

x = 1

number = lst[x]   # number got the value 1 from lst[1]

print(number)

x += 1           # x is incremented by 1

number = lst[x]  # add this line to change number, now it is lst[2]

print(number)
print(x)

#output
1
2
2

As others have pointed out, reassigning x will not automatically reassign number.

In general, having two variables that need to be reassigned at the same time is an easy way to confuse yourself -- if you ever forget to update one after updating the other, you're likely to have a bug in your program, and then you need to hunt all over the place to figure out at what point the two drifted apart.

A better approach is usually to have a single value (a single "source of truth") and then use a function that will automatically calculate the associated value from it. In an OOP context you'd frequently do this by defining a @property, but you can also do it with a plain old function:

numbers = [0, 1, 2, 3, 4]

x = 1
def number():
    return numbers[x]

print(number())
x += 1

print(number())
print(x)

prints:

1
2
2

Note that since number is a function, you need to call it (i.e. number()) to get the desired value. Calling the function is what causes numbers[x] to be re-evaluated, giving you the updated value for number.

Changing x after assigning number won't change number. For the intended result, you would have to reassign number after the x change:

list_num = [0, 1, 2, 3, 4] 
x = 1
number = list_num[x] 
print(number) 
x += 1 
number = list_num[x]
print(number) 
print(x)

EDIT: you should not use list as a variable name

here is the code:

lst = [0, 1, 2, 3, 4]

x = 1

number = lst[x]  # Assign the value at index 1 (1) to number
print(number)  # Output: 1

x += 1  # Increment the value of x by 1

number = lst[x]  # Reassign number with the updated value at index 2 (2)
print(number)  # Output: 2

print(x)  # Output: 2 (x has been incremented)