# Basic approximations in Python

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Approximation means estimating the value of something that is not quite accurate, but almost correct. It plays a vital role in science and technology. Let’s start with the most common example. Have you ever used the exact pi value? Of course not. It is an infinite irrational number with a very long meaning. If we continue to write the exact value of Pi , perhaps even this article will not be enough for this:

` 3.14159 26535 89793 23846 26433 83279 ... `

So here where approximation plays a role. We usually approximate Pi as `3.14` or in rational terms `22/7` . When you got to high school, you probably saw a wider application of approximations in mathematics, which use differentials to approximate the values ‚Äã‚Äãof quantities, such as (36.6) ^ 1/2 or (0.009) ^ 1/3. In computer science, we can use approximation to find the value or approximate the value of something using loops.

For example: approximation of the cube root of any number. Take a look at the process below:

 ` # Python program to approximate ` ` # cube root of 27 ` ` guess ` ` = ` ` 0.0 ` ` cube ` ` = ` ` 27 ` ` increment ` ` = ` ` 0.0001 ` ` epsilon ` ` = ` ` 0.1 ` ` # Find an approximate value ` ` while ` ` abs ` ` (guess ` ` * ` ` * ` ` 3 ` ` - ` ` cube) & gt; ` ` = ` ` epsilon: ` ` guess ` ` + ` ` = ` ` increment ` ` # Check approximate value ` ` if ` ` abs ` ` (guess ` ` * ` ` * ` ` 3 ` ` - ` ` cube) & gt; ` ` = ` ` epsilon: ` ` ` ` print ` ` ( ` ` "Failed on the cube root of" ` `, cube) ` ` else ` `: ` ` print ` ` (guess, ` `" is close to the cube root of "` `, cube) `

Output of the above code:

` 2.9963000000018987 is close to the cube root of 27 `

As we can see, 2.99 is not the exact value of ` (27) ^ 1/3 ` but is very close to the exact value 3. This is what we call approximation. Here we have used a series of calculations to approximate the value. First, we declare a variable ` guess = 0.0 ` which we will keep incrementing in a loop until it approaches the cube root of 27. Another variable ` epsilon ` is chosen as little as possible to get more accurate meaning. The line ` while abs (guess ** 3 - cube) & gt; = epsilon: ` will take care of this. If it breaks out of the loop with a value greater than ` epsilon `, it means that we have already crossed the approximate value and failed in the test. Otherwise, it will return the guess value.

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We hope this article has helped you to resolve the problem. Apart from Basic approximations in Python, check other code Python module-related topics.

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Javier Williams

California | 2023-03-26

Simply put and clear. Thank you for sharing. Basic approximations in Python and other issues with io Python module was always my weak point 😁. Will get back tomorrow with feedback

Carlo Galleotti

Berlin | 2023-03-26

Maybe there are another answers? What Basic approximations in Python exactly means?. I just hope that will not emerge anymore

Marie Lehnman

Shanghai | 2023-03-26

re Python module is always a bit confusing 😭 Basic approximations in Python is not the only problem I encountered. I am just not quite sure it is the best method

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