In python programming, if....elif...The else statement is a powerful control structure that allows us to execute different blocks based on multiple conditions.
Among them, the elif keyword plays an important role in this structure, which connects multiple conditional judgments to make ** more flexible and efficient.
This article will take you through the use of ELIF in Python to help you write more elegant **.
Basic grammar. ELIF is an abbreviation for Else IF and is used to check for another condition when the IF condition is not met. Its basic grammatical structure is as follows:
This section will be checked in the order of the conditions, and once the conditions that are met are found, the corresponding blocks will be executed, and subsequent condition checks will be skipped. If all conditions are not met, then the ** in the else block (if any) is executed.
Use cases for ELIF.
Multi-condition judgment: ELIF is useful when you need to perform different operations based on multiple conditions. For example, different evaluations are given according to different grades of achievement:
score = 85 if score >= 90: (tab)grade = "a" elif score >= 80: (tab)grade = "b" elif score >= 70: (tab)grade = "c" else: (tab)grade = "d"print(grade) output: b
Simplification: With ELIF, you can avoid the use of nested if statements and make them more concise. For example, determine whether a number is positive, negative, or zero:
num = -5 if num > 0: (tab)print("Positive") elif num < 0: (tab)print("Negative") else: (tab)print("Zero"Output: Negative.
Handling multiple mutexes: When multiple mutex conditions need to be handled, ELIF can help us ensure that only one block is executed. For example, to determine whether a number is odd or even:
num = 7 if num % 2 == 0: (tab)print("Even number") elif num % 2 == 1: (tab)print("Odd number"Output: Odd.
Precautions. The following points should be paid attention to when using it:
The ELIF must be followed by the IF and cannot be preceded by anything else**. ELIF can have more than one and is used to check multiple conditions. else is optional, and when all the if and elif conditions are not met, the ** in the else block will be executed. The order in which the conditions are judged is important, and once the conditions that are met are found, the subsequent conditions will not be checked. Summary.
In actual programming, the judicious use of ELIF can help us write more elegant and maintainable **.
Hopefully, this article will be helpful to you and make your path to python programming smoother!