📅  最后修改于: 2023-12-03 15:00:35.771000             🧑  作者: Mango
In Python, there is no direct "else if" keyword, instead, we use "elif" to achieve the same result.
The syntax of an "if-elif-else" statement in Python is as follows:
if condition_1:
# code block
elif condition_2:
# code block
else:
# code block
Here, the code block under the "if" statement is executed only if "condition_1" is true. If it's false, Python checks the "elif" statement(s) one by one until it finds one that's true. Once it finds a true statement, it executes the corresponding code block and exits the entire "if-elif-else" block. If none of the conditions are true, the code block under the "else" statement is executed.
Let's see a practical example:
x = 5
if x < 5:
print("x is less than 5")
elif x == 5:
print("x is equal to 5")
else:
print("x is greater than 5")
Here, "x" is compared to three different values using "if", "elif", and "else" statements. If "x" is less than 5, the first code block is executed. If it's equal to 5, the second code block is executed. If it's greater than 5, the third code block is executed.
So, that's how we use "elif" to create "else if" blocks in Python. It's a neat little feature that can come in handy when dealing with complex conditions.