Control flow statements in Jython allow you to execute different sections of code based on certain conditions. In this blog post, we will explore how to use if-else statements, switch statements, and various types of loops in Jython.

If-Else Statements

The if-else statement in Jython allows you to control the flow of your program based on whether a condition is true or false. Here’s an example:

age = 25

if age >= 18:
    print("You are an adult.")
else:
    print("You are a minor.")

In the example above, the program checks if the age variable is greater than or equal to 18. If the condition is true, it will print “You are an adult.” Otherwise, it will print “You are a minor.”

Switch Statements

Jython does not have a built-in switch statement like some other programming languages. However, you can emulate the behavior of a switch statement using if-elif-else statements. Here’s an example:

day = "Sunday"

if day == "Monday":
    print("It's the start of the week.")
elif day == "Friday":
    print("It's the end of the week.")
else:
    print("It's a regular day.")

In the example above, the program checks the value of the day variable and prints a different message based on the value. If the day is “Monday”, it will print “It’s the start of the week.” If it’s “Friday”, it will print “It’s the end of the week.” For any other day, it will print “It’s a regular day.”

Loops

Jython supports different types of loops to iterate over collections, execute a block of code multiple times, or repeat until a certain condition is met. Here are some examples:

For Loop

A for loop is used to iterate over a sequence of elements. Here’s an example:

fruits = ["apple", "banana", "cherry"]

for fruit in fruits:
    print(fruit)

In the example above, the loop iterates through each item in the fruits list and prints it.

While Loop

A while loop executes a block of code repeatedly as long as a certain condition is true. Here’s an example:

count = 0

while count < 5:
    print("Count:", count)
    count += 1

In the example above, the loop prints the value of count and increments it by 1. It continues to execute as long as count is less than 5.

Conclusion

Control flow statements such as if-else statements, switch statements (emulated using if-elif-else), and loops are essential in any programming language, including Jython. They allow you to control the flow of your program based on conditions and perform repetitive tasks. Understanding these control flow statements is crucial for writing efficient and effective Jython code.

#jython #controlflow