Answer:
Step-by-step explanation:
What is a Python if statement?
If is a conditional statement used for decision-making operations. In other words, it enables the programmer to run a specific code only when a certain condition is met. The body of a Python if statement begins with indentation. The first unindented line marks the end. Remember that non-zero values are interpreted by Python as True while None and 0 are False.
Example of an if statement in Python: If Statement
How if statements work in Python
First, the program evaluates your test expression. If it is true, the statement (or statements) will be executed. If it is false, the statement(s) will not be executed. The following flow chart demonstrates how an if statement works in Python: If Statement
Try it yourself
PYTHON
x = 73
y = 55
#Write an if statement that prints "x is greater than y" when true
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x = 73
y = 55
#Write an if statement that prints "x is greater than y" when true
What is a Python if-else statement?
An if-else statement adds onto the function of an if statement. Instead of simply refraining from executing statement(s) when the test expression is false, it provides alternative instructions for the program to follow. You’ll use indentation to separate the if and else blocks of code.
Example of an if-else statement in Python: if-else statement
How if-else statements work
The program evaluates your test expression. If it is true, the statement (or statements) will be executed. If it is false, the program will follow the alternative instructions provided. The following flow chart demonstrates how an if-else statement works in Python: If else Statement
Can you use if without else?
You can use if without else if you don’t want anything to be done when the if conditions are False.
How to write an if-else statement in Python
Here’s a breakdown of the syntax of an if-else statement:
PYTHON
if #expression:
#statement
else:
#statement
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if #expression:
#statement
else:
#statement
Try it yourself
PYTHON
fruits = ["apple","orange","banana","grape","pear"]
item = "cucumber"
#Write an if-else statement that prints "[item] is a fruit" or "[item] is not a fruit"
#depending on whether it's in the list of fruits
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fruits = ["apple","orange","banana","grape","pear"]
item = "cucumber"
#Write an if-else statement that prints "[item] is a fruit" or "[item] is not a fruit"
#depending on whether it's in the list of fruits
How can you write an if-else statement in one line?
You can write an if-else statement in one line using a ternary operator, or, a conditional expression. Keep in mind that using this method in excess can make your code more difficult to read.
How to use an if-else statement in Python
If you need a program to execute certain functions under specific conditions, you should use an if-else statement. Conditional statements like if-else are also known as conditional flow statements. This name comes from the ability to control the flow of your code on a situational basis. It can be helpful to think of conditional statements as a set of rules for Python to follow.
How can you exit out of an if-else statement?
In a loop, you can use the jump statement break. break enables you to move the flow of program execution outside the loop once a specific condition is met. In a function, you can use return or yield to exit an if statement.
What is elif in Python?
Elif is the shortened version of else if. It enables you to perform a series of checks to evaluate the conditions of multiple expressions. For example, suppose the first statement is false, but you want to check for another condition before executing the else block. In that case, you can use elif to look for the other specified condition before Python decides which action to take. You can have any number of elif statements following an if statement.
Example of an if-elif-else statement: if elif else
Here, each number from -2 to 1 gets passed through the if-elif-else statement. Once a condition is true, the interpreter executes that block of code.
How if-elif-else else works in Python
The interpreter will evaluate multiple expressions one at a time, starting with the if statement. Once an expression is evaluated as True, that block of code will execute. If no expression is True, the else statement will execute. The following flow chart demonstrates how an if-elif-else statement works in Python:
Elif statement
Can you have multiple elif blocks in python?
There is no limit to the number of elif blocks you use as long as there is only one if and one else per statement block.
What is a nested if-else statement?
In programming, “nesting” is a term that describes placing one programming construct inside another. For example, suppose you have more than two options to handle in your code. In that case, you can use a nested if-else statement to check conditions in consecutive order. Once a condition succeeds, it will move on to the next block. In the event that none of the conditions are true, the else clause will take effect