Introduction to ctrl-flow for Python

The ctrl-flow library is a robust package designed to enhance Python’s control flow mechanisms, allowing for more readable, maintainable, and efficient code. Whether you’re handling complex branching, concurrency, or exception handling, ctrl-flow provides intuitive and flexible APIs to optimize your workflows.

API Explanations and Code Snippets

1. Conditional Execution

The IfElse class simplifies conditional statements.

 from ctrl_flow import IfElse
def positive_or_negative(number):
    return IfElse(number > 0, "Positive", "Negative").run()

print(positive_or_negative(10))  # Output: Positive print(positive_or_negative(-5))  # Output: Negative 

2. Loop Execution

The Loop class helps manage loops more effectively.

 from ctrl_flow import Loop
def print_numbers(n):
    Loop(lambda i: i < n, lambda i: print(i) or i + 1, 0).run()

print_numbers(5) # Output:  # 0 # 1 # 2 # 3 # 4 

3. Exception Handling

The TryExcept class simplifies try-except blocks.

 from ctrl_flow import TryExcept
def safe_divide(a, b):
    return TryExcept(lambda: a / b, ZeroDivisionError, lambda e: 'Cannot divide by zero').run()

print(safe_divide(10, 2))  # Output: 5.0 print(safe_divide(10, 0))  # Output: Cannot divide by zero 

4. Concurrent Execution

The Concurrent class allows for easy concurrent execution of tasks.

 from ctrl_flow import Concurrent import time
def task(name, duration):
    time.sleep(duration)
    return f'Task {name} completed in {duration} seconds'

results = Concurrent([
    lambda: task('A', 2),
    lambda: task('B', 3),
    lambda: task('C', 1)
]).run()
for result in results:
    print(result)
# Output: # Task A completed in 2 seconds # Task B completed in 3 seconds # Task C completed in 1 second 

App Example Using ctrl-flow

Here is an example app that demonstrates using the ctrl-flow library to handle various tasks.

 import time from ctrl_flow import IfElse, Loop, TryExcept, Concurrent
# Conditional task def welcome_user(age):
    return IfElse(age > 18, "Welcome, adult user!", "Welcome, young user!").run()

# Loop task def countdown(n):
    print("Starting countdown:")
    Loop(lambda i: i>0, lambda i: print(i) or time.sleep(1) or i-1, n).run()
    print("Countdown ended!")

# Safe calculation def safe_calculation(a, b):
    return TryExcept(lambda: a / b, ZeroDivisionError, lambda e: 'Division by zero error').run()

# Concurrent tasks def simulate_io_tasks():
    tasks = [
        lambda: (time.sleep(2), "Task 1 completed"),
        lambda: (time.sleep(3), "Task 2 completed"),
        lambda: (time.sleep(1), "Task 3 completed"),
    ]
    results = Concurrent(tasks).run()
    for result in results:
        print(result)

if __name__ == "__main__":
    print(welcome_user(20))
    countdown(5)
    print(safe_calculation(10, 2))
    print(safe_calculation(10, 0))
    simulate_io_tasks()

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