Algorithm complexity: if/else under for loop

Question

I am wondering if in a situation like the following (an if/else statement under a for loop) the complexity would be O(n) or O(n^2):

for character in string:
    if character==something:
        do something
    else:
        do something else.

Thank you!

Answer 1

这将是

如果“做某事”和“做某事”为O（1），则为O（n）

如果“做某事”和“做某事”为O（n），则为O（n ^ 2）

基本上，for循环的复杂度取决于it组件和no的复杂度。的循环。