04-02-2021-Carpentry-for-HGIS/01_Day_1_Unix_Shell/excercises/B6_Exercise_Lists

[utterances-bot]

Lists and indexing — Python essentials for GIS learners

https://the-magnificents.github.io/04-02-2021-Carpentry-for-HGIS/01_Day_1_Unix_Shell/excercises/B6_Exercise_Lists.html

[yvanmil]

I understand the exercises (mostly after reading the solution), but it is so much. How do you learn these codes... is there a coding dictionary?

[jurra]

@yvanmil that is a good question, I think the best way to learn is to combine several things: (Today is a good way to start how to learn to code)

• Trying out and experimenting with these tools as we are doing today
• Spend time coding, specially when you are starting, it is important to practice and do exercises
• Find a purpose to use code in your research flow
• Learn how to formulate computational research tasks or questions.

You need to have a good motivation, focus and take it step by step as a ladder, avoid going fast, instead learn as much as possible on each step.

It can be similar to learning how to draw, or play an instrument, its kind of a craft.

[aecryan]

@yvanmil you are learning it right now! :) A great resource for Python tutorials is https://realpython.com/, and if you like this hands-on style of practicing working with code, I really liked Codeacademy's model. These two resources together with a lot of real-life applications were my path to learning and improving which of course is always in process. :)

[aecryan]

Lastly, some people have made "cheat sheets" for Python that can help when you need to remember specific commands over and over again: https://www.pythoncheatsheet.org/

[manuGil]

@yvanmil Programming might seem complex at the beginning, and there's no programmer who will ever know everything about a programming language (specially because, programming languages also change). There's not a codding dictionary, but official documentation. Don't get discourage, when in doubt, consult the documentation and look for examples on the web.

[yvanmil]

Thank you for the motivation..... -- Yvonne van Mil research and mapping

web: www.yvonnevanmil.com I mail: @.*** I phone: +31 (0)64 139 9049 I LinkedIn: https://www.linkedin.com/in/yvonnevanmil/

Op ma 15 mrt. 2021 om 16:18 schreef Manuel Garcia @.***

:

@yvanmil https://github.com/yvanmil Programming might seem complex at the beginning, and there's no programmer who will ever know everything about a programming language (specially because, programming languages also change). There's not a codding dictionary, but official documentation https://docs.python.org/3/. Don't get discourage, when in doubt, consult the documentation and look for examples on the web.

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[cforgaci]

Done. Interesting to see the difference between Program A and Program B in the last exercise. When would be the behaviour shown in Program A desired? Or is this to show that making a copy before changing a variable should be done as in Program B?

[MertenNefs]

The slicing with double colons is a bit of a mystery to me, especially the difference between the two examples, which seem to do something totally different. The rest I found more understandable. Maybe I have to get used to the PY syntax some more.

[jurra]

In the case of the last one (as well as in the previous), the main difference is that "A" points to an existing object "old", while "B" creates a new object from an existing one. "B" creates a new spot in memory for this particular assignment, while the other just references to that existing variable. This is why in A programs both results are the same.

I if you want to compare old and new, value then you should keep both values before doing the comparison, hence B is more suitable in this sense.