Python for Entrepreneurs Transcripts
Chapter: Appendix: Python language concepts
Lecture: Concept: Tuples
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Tuples are a lightweight, immutable data structure in Python
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that's kind of like a list but that can't be changed once you create them.
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And you'll see many very cool techniques that make Python readable
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and easy to use are actually clever applications of tuples.
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On the first line here, we are defining a tuple m,
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the way you define a tuple is you list out the values and you separate them by commas.
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When you look at it, it appears like the parenthesis are part of the definition,
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and when you print tuples you'll see that the parenthesis do appear
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but it's not actually the parenthesis that create them, it's the commas.
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We want to get the value out over here we want to get the temperature,
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which is the first value, we would say m[0], so zero-based index into them.
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If we want the last value, the fourth one,
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we would say m[3], that's the quality of the measurements.
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Notice below we are redefining m, this time without the parentheses,
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just the commas and we print it out and we get exactly the same thing again,
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so like I said, it's the commas that define the tuple not the parentheses,
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there is a few edge cases where you will actually need to put the parentheses
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but for the most part, commas.
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Finally, tuples can be unpacked,
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or assigned to a group of variables that contain the individual values.
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So down here you can see we have a "t" for temperature,
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"la" for latitude "lo" for longitude, and "q" for quality,
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and those are the four measurements in our tuple,
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we want to assign those and instead of doing like we did above
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where you index each item out and assign them individually,
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we can do this all in one shot, so here we can say variable,
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four variables separated by commas equals the tuple,
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and that reverses the assignment so you can see "t" has the right value of 22,
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latitude 44, longitude 19 and the quality is strong.
