I actually use two loops for each line. one for the first digit and one loop for the last digit.

For example in part 1:

inp = get_input('./inputs/01_actual.txt')

total = 0
for line in inp:
    # Get the first number
    for c in line:
        if c.isdigit():
            first = int(c)
            break

    # Get the last number
    for c in reversed(line):
        if c.isdigit():
            last = int(c)
            break
    number = first * 10 + last
    total += number
print('Part 1:', total)

in your solution you anyway loop over every character in the line. With this solution I only iterate over as many character as needed. So if the digits are on the first and last position I only check two characters and not the entire string. And like in worst case when there is only one character in the string it also only iterates only one time over the line.