Week 7 Flashcards
What are the attributes of a set?
- they’re mutable.
- they’re unordered.
- they’re unique; cannot contain duplicate items.
How do you declare a set?
With curly brackets.
How do you declare an empty set?
With normal brackets and the word “set”() because empty curly brackets would be declaring a dictionary.
How do you add and remove items from a set?
.add() and .remove()
What is this? [“bobothy”, “jimrick”, “billiam”]
A list.
How do you delete an item from a dictionary?
using the del() keyword, then the dictionary’s name and then the key of the item you want to remove. Like this:
del item[“thingo”]
How do you declare a dictionary?
With curly brackets.
What is the default mode for opening a file in Python?
Read (“r”).
What is boundary-value analysis in Python?
It is used to identify defects and errors in software by testing input values on the boundaries of the allowable ranges.
What is black-box testing?
Black box testing involves testing a system with no prior knowledge of its internal workings. A tester provides an input, and observes the output generated by the system under test.
The focus is on what the program does, not how it does it. You test the program by providing various inputs and comparing the outputs with the expected results.
What is equivalence partitioning in Python?
Equivalence partitioning is a black-box testing technique that divides input domains into classes of data so that test cases can be derived.
What are try and except blocks?
“Try” contains code that might raise an exception, and the except block tells the program what to do if that happens.
What does EAFP (Easier to Ask for Forgiveness than Permission) mean in coding?
Where you try to perform an operation and catch any exceptions if they occur.
What does LBYL (Look Before You Leap) mean in coding?
That you check conditions before attempting an operation, so you avoid triggering exceptions.
When it comes to EAFP and LBYL, which is more encouraged in Python?
Python encourages the EAFP approach because it focuses on trying to execute and handle errors, rather than pre-checking for every possible issue.
Why would you use the raise keyword?
Whenever the programmer decides something so exceptional happens that the control flow should be stopped, like for incorrect user input or an unexpected calculation result.
What does __init__ stand for?
It stands for initialisation or instantiation. It’s needed for classes.
