{"id":13,"date":"2024-01-24T09:10:21","date_gmt":"2024-01-24T09:10:21","guid":{"rendered":"https:\/\/learnpython.elegantwallp.com\/?p=13"},"modified":"2024-01-24T09:10:22","modified_gmt":"2024-01-24T09:10:22","slug":"python-variables","status":"publish","type":"post","link":"https:\/\/learnpython.elegantwallp.com\/2024\/01\/24\/python-variables\/","title":{"rendered":"Python Variables"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you\u2019ll learn about Python variables and how to use them effectively.<\/p>\n\n\n\n

What is a variable in Python<\/h2>\n\n\n\n

When you develop a program, you need to manage values, a lot of them. To store values, you use variables.<\/p>\n\n\n\n

In Python, a variable is a label that you can assign a value to it. And a variable is always associated with a value. For example:<\/p>\n\n\n\n

message = 'Hello, World!' print(message) message = 'Good Bye!' print(message)<\/code>Code language: Python (python)<\/small><\/code><\/pre>\n\n\n\n
Output:<\/p>\n\n\n\n
Hello, World! Good Bye!<\/code>Code language: Python (python)<\/small><\/code><\/pre>\n\n\n\n
In this example, message<\/code> is a variable. It holds the string 'Hello, World!'<\/code>. The print()<\/code> function shows the message Hello, World!<\/code> to the screen.<\/p>\n\n\n\n
The next line assigns the string 'Good Bye!'<\/code> to the message<\/code> variable and print its value to the screen.<\/p>\n\n\n\n
The variable message<\/code> can hold various values at different times. And its value can change throughout the program.<\/p>\n\n\n\n
Creating variables<\/h2>\n\n\n\n
To define a variable, you use the following syntax<\/p>\n\n\n\n
variable_name = value<\/code>Code language: Python (python)<\/small><\/code><\/pre>\n\n\n\n
The =<\/code> is the assignment operator. In this syntax, you assign a value to the variable_name<\/code>.<\/p>\n\n\n\n
The value can be anything like a number<\/a>, a string<\/a>, etc., that you assign to the variable.<\/p>\n\n\n\n
The following defines a variable named counter<\/code> and assigns the number 1 to it:counter = 1<\/code>Code language: Python (python)<\/small><\/p>\n\n\n\n
Naming variables<\/h2>\n\n\n\n
When you name a variable, you need to adhere to some rules. If you don\u2019t, you\u2019ll get an error.<\/p>\n\n\n\n
The following are the variable rules that you should keep in mind:<\/p>\n\n\n\n
    \n
  • Variable names can contain only letters, numbers, and underscores (_<\/code>). They can start with a letter or an underscore (_<\/code>), not with a number.<\/li>\n\n\n\n
  • Variable names cannot contain spaces. To separate words in variables, you use underscores for example sorted_list<\/code>.<\/li>\n\n\n\n
  • Variable names cannot be the same as keywords, reserved words, and built-in functions in Python.<\/li>\n<\/ul>\n\n\n\n
    The following guidelines help you define good variable names:<\/p>\n\n\n\n
      \n
    • Variable names should be concise and descriptive. For example, the active_user<\/code> variable is more descriptive than the au<\/code>.<\/li>\n\n\n\n
    • Use underscores (_) to separate multiple words in the variable names.<\/li>\n\n\n\n
    • Avoid using the letter l<\/code> and the uppercase letter O<\/code> because they look like the number 1<\/code> and 0<\/code>.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
      Summary: in this tutorial, you\u2019ll learn about Python variables and how to use them effectively. What is a variable in Python When you develop a program, you need to manage values, a lot of them. To store values, you use variables. In Python, a variable is a label that you can assign a value to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-13","post","type-post","status-publish","format-standard","hentry","category-1-fundamentals"],"_links":{"self":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/comments?post=13"}],"version-history":[{"count":1,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/13\/revisions"}],"predecessor-version":[{"id":14,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/13\/revisions\/14"}],"wp:attachment":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/media?parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/categories?post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/tags?post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}