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Python: data types and the input() function

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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Python: Challenges and Solutions (Chapter 1. Getting Started. The Game Over Program).

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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Python: Challenges and Decisions (Chapter 2. Types, Variables, and Basic I/O. Useless Facts Program).

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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Python – branching structures (if else, if, ifelif statements)

The if statement (if) is used to set conditions (if so, then…), for example:

cat_say = ‘mew’

if cat_say = ‘mew’ of cat_say = ‘myavki’:

….print(‘Dear, cat! Here’s your food!’)

Important: when using if conditions, you need to write double equals and put a colon at the end of the expression to show the end of the condition; before the rest of the code related to the condition, and print is indented with a tab (or 4 spaces).

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Python – Boolean Operators and Conditions

Basic conditions in Python:

< (one less than the other)

> (one more than the other)

<= (one is less than or equal to the other)

>= (one is greater than or equal to the other)

!= (one is not equal to the other)

== (one is equal to the other)

Examples of using conditions:

print(5 > 4)

True #result

print(‘cat’==’dog’)

False #result

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Python: базовые операторы ввода и вывода текста

Самые первые операции с текстом и базовые сведения о Python, которые помогают тут же начать программировать:

  1. # Comments

  2. Ограничители '' или "" и экранирование символов ' и "

  3. print('Hello world') – переход на новую строку

  4. end='...' – следующий print склеится

  5. escape-последовательности:

    a – системный динамик

    n – переход на новую строку (пустая строка)

    t – отступ типа tab

  6. + сцепление строк без разделителя

  7. * повторение строк без разделителя

  8. продолжение строки кода на следующей строке

  9. input('Press Entr to exit')

  10. Базовые математические операторы (+,-,*,/,//,%).

  11. Составные операторы присвоения

  12. Строковые методы (применяются к строке с текстом): I am cat

    .upper() I Am CAT

    .lower() i am cat

    .title() I Am Cat

    .replace(old,new,max число замен) заменяет старый текст на новый

    .swapcase() меняет регистры наоборот i Am Cat

    .capitalize() первая буква большая, остальные строчные I am cat

    .strip() строка без интервалов Iamcat

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