We continue to learn the programming language. Let’s move on to chapter 4 of the book: Michael Dawson “Python Programming”, 2014 (Michael Dawson “Python Programming for the Absolute Beginner”, 3rd Edition), where we will study loops with the for () operator, introducing constants into code, slices and tuples, working with sequences on the example of strings with the operators len(), range(), in, jumble(), etc.

Summary of chapter 4 with examples of programs I wrote:

Cycles (loops) for

We already know loops with the while statement, and have even done a lot of tasks. Remember, there is a control variable introduced before the loop, which is then used in the condition, which in turn is tested for truth every round of the loop. So with the for loop, things are a little different. Читать →

When running the code, a syntax error occurs – inconsistent use of tabs and spaces in indentation. What does this mean and how to solve this problem? The fact is that python enforces uniformity in the use of spaces, which show the indentation of parts of the code. If you use tab, it can get tricky because some of the tabs can be misinterpreted as spaces. As a result, you see a syntax error that can be difficult to fix. Читать →

In the Python programming language, there are three types objects (or data types – data type):

• scalar (indivisible)

  • int (integers, integer, e.g. 5);
  • float (real number, numbers with a semicolon, for example: 5.5);
  • bool(true/false, true/false);

• non-scalar (divisible)

  • str (string, string – all letters, text; everything that is not numbers).

Find out data type in Python:

type(…)

Example:

type(‘a’) – write a command

str – get the answer

There are several data types in the Python programming language, for example:

• integers int(x), for example, 1-2-3-4;
• fractional numbers float(x), for example, 1.0-2.0-3.5;
• str(x) strings, which can contain text and other characters.

The input() function has already been discussed earlier, this function allows the user to enter data into the program, this data can be further used.

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We continue to learn programming. After the second chapter in the book: Michael Dawson “We Program in Python”, 2014 (Michael Dawson “Python Programming for the Absolute Beginner”, 3rd Edition), where I studied the features of working with text in the Python programming language, tasks were offered. Let’s do them together. I will give my solution, and you write your options in the comments.

1) Learn how to trigger a bug: Interactively enter the name of your favorite ice cream brand. Then fix the error and create a command that will correctly display the name on the screen this type of ice cream.

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We continue to learn programming. After the second chapter in the book: Michael Dawson “We Program in Python”, 2014 (Michael Dawson “Python Programming for the Absolute Beginner”, 3rd Edition), where I studied the features of working with text in the Python programming language, tasks were offered. Let’s do them together. I will give my solution, and you write your options in the comments.

1) Come up with two lists: valid and invalid variable names. Explain why each of the names is valid or not valid, respectively. Then come up with two more lists—of “good” and “bad” valid names—and explain your choice.

Valid variable names: name, price, password, age, size (these can be any words that are not reserved in the programming language for functions / operators)

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