Join Barron Stone for an in-depth discussion in this video Polling for a condition, part of Programming Foundations: Real-World Examples.
- There will be times…when you need a program to detect…that some event has occurred,…and then react to that event…by performing a certain action.…To accomplish that, there are two approaches you could use:…polling, or event-driven programming.…With the polling method,…a program is continuously checking and checking and checking…and actively checking for a certain condition to occur,…like a button being pressed.…And when it sees that the condition has occurred,…it'll then perform an appropriate action.…My house is ready for my friends,…so now I'm just waiting…for the pizza delivery guy to get here.…
When the pizza man arrives,…I'll need to perform the appropriate action…by opening the door, and getting the pizza.…So, how will I know when the pizza man…is on the front porch to get my pizza?…Well, I could try the polling method,…and to do that, I'll have to get up off my bed,…then I go down the stairs,…(door opens) I check to see if he's here.…Not yet.…(door closes)…So then I head back up the stairs,…and then I return back to lounging.…
Author
Barron Stone
Released
12/21/2015- Reusing functions
- Local vs. global variables
- Creating and naming custom objects
- Class inheritance
- Modules and packages
- Multidimensional lists and tuples
- Queues and stacks
- Creating and combining sets
- Storing data in dictionaries
- If/else and switch statements
- For vs. while loops
- Error handling
- Polling and event-driven programming
Skill Level Beginner
Duration
Views
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Introduction
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Welcome57s
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Using the exercise files1m 10s
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Installing Python 3 for Mac1m 56s
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1. Functions
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Cook with functions7m 16s
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Code reuse4m 44s
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Add new input parameters6m 12s
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Local and global variables7m 58s
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2. Objects
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Clothing as objects7m 25s
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Custom objects6m 3s
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Naming objects4m 44s
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Mutable and immutable data4m 32s
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3. Class Inheritance
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Inheriting classes7m 4s
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Override inherited methods3m 59s
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4. Modules and Packages
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Select tools from modules6m 55s
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Import tools from packages3m 42s
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5. Lists and Tuples
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Parking with lists7m 29s
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Multidimensional lists6m 50s
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Tuples4m 25s
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6. Queues and Stacks
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7. Sets
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Create and combine sets3m 40s
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Sort sets4m 45s
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8. Dictionaries
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Dictionaries3m 45s
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Add items to dictionaries4m 43s
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Reverse lookup issues4m 22s
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9. Conditional Execution
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If/else-if chains5m 52s
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Switch and case statements4m 31s
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10. Loops
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For loops5m 1s
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While loops3m 41s
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Break statements3m 37s
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11. Error Handling
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Error catching5m 39s
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Validate external input6m 9s
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Custom errors6m 49s
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12. Polling and Event-Driven Programming
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Polling for a condition6m 25s
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Event driven programming7m 30s
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Conclusion
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Next steps26s
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Video: Polling for a condition