Why do we need elif operation(python)?

Question

Why do we need elif operation if we can just simply do it with if?
For example,
if 1 == 3:
print(“hi”)
elif 1 == 1:
print(“hello”)

if 1 == 3:
print(“hi”)
if 1 == 1:
print(“hello”)

What is the difference???

Answer 1

if (true):
#something
if (true):
#something

#both statements will be executed

if (true):
#something
elif (true):
#something

#only the first statement will be executed

#elif evaluates only if the previous if/elif evaluated to false.

https://stackoverflow.com/questions/25703446/whats-the-main-difference-between-if-and-else-if

Answer 2

Sometimes, the result depand on all the conditions
if g % 7 == 0:
if f % 3 == 0:
do x
elif f % 5:
do x2
elif g % 5 == 0:
if f % 3 == 0:
do y
elif f % 5 == 0:
do y2

etc.

p.s.
+1 for @Hatsy Rei, if we fond that the first condition is enough, why keep asking?
It's not efficient.

Answer 3

@Amir Galanty Smoliar
Thanks for all those explanations, but I don’t get it. Can you explain it more easily please?