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Original
2026-01-01
Modified
2026-02-21
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<p>When we're making a dish, we follow the recipe carefully. Otherwise, the food won't turn out as expected. The same rule applies to programming.</p>
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<p>When we're making a dish, we follow the recipe carefully. Otherwise, the food won't turn out as expected. The same rule applies to programming.</p>
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<p>We want to see the expected result onscreen, so we should give the computer clear, step-by-step directions. We can do it using instructions. An instruction is a command to the computer, a unit of execution. In this case, Python code is a set of instructions. We can present it as a step-by-step recipe.</p>
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<p>We want to see the expected result onscreen, so we should give the computer clear, step-by-step directions. We can do it using instructions. An instruction is a command to the computer, a unit of execution. In this case, Python code is a set of instructions. We can present it as a step-by-step recipe.</p>
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<p>We run the Python code using an<strong>interpreter</strong>, a program that executes instructions strictly one at a time. Like the steps in a recipe, the instructions for the interpreter are written in order and separated by jumping to the following line.</p>
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<p>We run the Python code using an<strong>interpreter</strong>, a program that executes instructions strictly one at a time. Like the steps in a recipe, the instructions for the interpreter are written in order and separated by jumping to the following line.</p>
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<p>Developers must understand the order of operations in the code and be able to mentally break the program into independent parts that are convenient for analysis.</p>
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<p>Developers must understand the order of operations in the code and be able to mentally break the program into independent parts that are convenient for analysis.</p>
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<p>Let's look at an example of some code with two instructions. When it's started, two sentences are displayed sequentially on the screen:</p>
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<p>Let's look at an example of some code with two instructions. When it's started, two sentences are displayed sequentially on the screen:</p>
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<p>We said above that instructions are separated from each other by a line break. But there is another way: you can separate them with a semicolon:</p>
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<p>We said above that instructions are separated from each other by a line break. But there is another way: you can separate them with a semicolon:</p>
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<p>There is no technical difference between the first and second versions. The interpreter will understand the instructions the same way, but it is physically inconvenient to read the second version.</p>
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<p>There is no technical difference between the first and second versions. The interpreter will understand the instructions the same way, but it is physically inconvenient to read the second version.</p>
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<p>It is better to place the instructions under each other. It makes it easier for colleagues to read your code, maintain it, and make changes.</p>
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<p>It is better to place the instructions under each other. It makes it easier for colleagues to read your code, maintain it, and make changes.</p>