Make a copy of a list

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Christian Lawson-Perfect

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Christian Lawson-Perfect 1 year, 10 months ago

Published this.

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Christian Lawson-Perfect 3 years, 1 month ago

Created this.

Name	Status	Author	Last Modified
Make a copy of a list	draft	Christian Lawson-Perfect	10/05/2023 13:29
Make a copy of a list	Ready to use	Christian Lawson-Perfect	23/11/2023 11:36

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Question statement

Give any introductory information the student needs.

			Name	Type	Generated Value

Automatically regenerate variables?

No variables have been defined in this question.

Parts

Code
1. Alt Didn't copy

Code

Ask the student a question, and give any hints about how they should answer this part.

The variable list1 contains a list.

Write code to assign a copy of the list to the variable list2.

Help with this part type

Marks

Show correct answer on reveal?

Show score feedback icon?

Show the input hint?

Code language

The language that the student's code will be written in.

Correct answer

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list2 = list1[:]

A correct answer to the part.

Substitute question variables into the correct answer?

If ticked, then JME expressions between curly braces will be evaluated and substituted into the correct answer.

If not ticked, then the correct answer will be displayed exactly as it is.

Show stdout?

If ticked, the STDOUT produced after running the student's code will be shown in the feedback.

Show stderr?

If ticked, the STDERR produced after running the student's code will be shown in the feedback.

Show errors produced by marking tests?

Placeholder

​x
 
​

Initial text for the code editor

Student code modifier

​

JME expression to modify the student's submitted code before being passed to the marking template. The student's code is available as the string variable studentAnswer.

Preamble

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from random import randrange
list1 = [randrange(1,10) for i in range(50)]

This code is run before the student's code. Define anything that the student's code or your tests need.

Postamble

​

This code is run after the student's code but before the validation and unit tests.

Format postamble output as code?

If ticked, any output produced by the postamble will be formatted in monospace font, with whitespace preserved. If not ticked, it'll be presented as prose text or HTML.

Marking tests

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[
  ["list2 is equal to list1, but not the same object", 1, "list1 == list2 and list1 is not list2"]
]

A list of tests used to mark the student's answer.
Each item is a list with three values:

The name of the test, shown to the student above any feedback.
The proportion of the credit available for the part to award if this test is passed.
The code to run.

Validation tests

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[
  py_valid_defined('list2')
]

A list of tests used to validate that the student's code is acceptable.
Each item is a list with two string values:

A name which will be shown to the student if the test fails.
The code to run.

Variables to include in code

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dict()

Give a dictionary mapping variable names to their values. These variables will be available in the code that is run.

Advice

In Python, a variable is a reference to an object. More than one variable can refer to the same object.

If you wrote list2 = list1, then list2 would refer to the same object as list1, and any changes to list1 would be reflected in list2 as well.

In order to make an independent copy, you should make a slice of list1:

{code_block("list2 = list1[:]", "python")}

This creates a new list object, with all the same elements as list1.

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet

This question is used in the following exam:

Programming extension demo by Christian Lawson-Perfect in Programming extension.

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

History

Comment

Checkpoint description

Christian Lawson-Perfect 1 year, 10 months ago

Christian Lawson-Perfect 3 years, 1 month ago

Error in variable testing condition

Parts

Code