Order of if statements?

I wonder if the first if statement is True, whether are the following elif executed or not (even if they are also True) ?

I have tried:

if True:
    print "Hi"
elif True:
    print "hello"

And it prints only "Hi". But in a more complex part of my code, I see some print outputs displayed that are within some elif statements and I just basically switch the very first if to True so that none of the elif should be executed for testing purposes. So why are the print statement that are within the elif printed?

(code is too long to print here, I just wonder if it could be an answer without...)