{"id":12878,"date":"2020-11-19T00:27:08","date_gmt":"2020-11-19T08:27:08","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=12878"},"modified":"2023-12-01T04:04:11","modified_gmt":"2023-12-01T12:04:11","slug":"python-lowercase","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/python-lowercase\/","title":{"rendered":"Python Lowercase: A Step-By-Step Guide"},"content":{"rendered":"\n

The Python lower() function converts a string to all lowercase. The Python isLower() method will check if the alphabetical characters in a string are all lowercase and return True or False. The lower() and isLower() functions are useful for fields like email where all letters should be lowercase.<\/em><\/p>\n\n\n\n

\n\n\n\n

When you\u2019re working with a string in Python, you may want to convert the contents of that string to lowercase.<\/p>\n\n\n\n

For example, you may be creating a sign up form that converts a user\u2019s email to lowercase. This is a common practice used to ensure that another account cannot be created using the same email in uppercase because strings are case-sensitive.<\/p>\n\n\n\n

Python Lowercase<\/h2>\n\n\n\n

The Python built-in function lower()<\/em> can be used to convert a string into lowercase and return a copy of the revised string. In addition, the Python isLower()<\/em> method can be used to check whether all the characters within a string appear in lowercase.<\/p>\n\n\n\n

In this tutorial, we will discuss how to use the lower()<\/em> and isLower()<\/em> methods to work with lowercase strings. We will explore examples for each of these methods to show how they can work in a Python program.<\/p>\n\n\n\n

lower() Python Method<\/h2>\n\n\n\n

The Python lower() method converts all characters in a string to lowercase. Numbers and special characters are left unchanged. lower() is added to the end of a Python string value<\/a>.<\/p>\n\n\n\n

lower() is one of Python’s string methods. It works on all cased characters in a string. Here\u2019s the syntax for the Python lower()<\/em> function:<\/p>\n\n\n\n

string_name.lower()<\/pre><\/div>\n\n\n\n
The lower()<\/em> function takes in no parameters.<\/p>\n\n\n\n
To show off how lower()<\/em> works, we\u2019ll use an example.<\/p>\n\n\n\n
Lowercase Python Example<\/h3>\n\n\n\n
Let\u2019s say that we are creating a sign up form, and we want to convert the email address a user inserts into lowercase. We could do so by using the following code:<\/p>\n\n\n\n
email = input("What is your email address?")\nprint(email)\n\nfinal_email = email.lower()\nprint(final_email)<\/pre><\/div>\n\n\n\n
Upon execution, our code returns the following strings: <\/p>\n\n\n\n
What is your email address?\naLex@gmail.com\naLex@gmail.com\nalex@gmail.com<\/pre><\/div>\n\n\n\n
We declare a variable called email<\/em> that collects an email address from the user. In this case, we inserted \u201caLex@gmail.com<\/a>\u201d as our email. Then, we print out that email to the console in the format that it appeared when it was entered into the Python console.<\/p>\n\n\n\n
On the next line, we declare a Python variable<\/a> called final_email<\/em> which converts the contents of the email<\/em> variable to lowercase. Finally, we print final_email<\/em> to the console, which returns our original string but in lowercase.<\/p>\n\n\n\n
lower()<\/em> will return symbols and numbers in their regular state because those characters are not case-sensitive. Only the Unicode characters in a string are converted to lowercase.<\/p>\n\n\n\n
Python isLower()<\/h2>\n\n\n\n
The Python isLower() method evaluates whether all characters in a string are lowercase. This method does not check numbers, spaces, and other non-alphabetical characters.<\/p>\n\n\n\n
Before you convert a string to lowercase, you may want to evaluate whether that string is already in lowercase. That\u2019s where the isLower()<\/em> method comes in.<\/p>\n\n\n\n
isLower()<\/em> returns a True or False value based on whether the string contains only lowercase characters. Here\u2019s the syntax for the Python isLower()<\/em> method:<\/p>\n\n\n\n
string_name.isLower()<\/pre><\/div>\n\n\n\n
Like the lower()<\/em> method, isLower()<\/em> does not take any parameters. Instead, it is appended to the end of a string value.<\/p>\n\n\n\n
isLower() Python Example<\/h3>\n\n\n\n
Let\u2019s use an example to showcase how the lower()<\/em> method works. For instance, before we convert a user\u2019s email to lowercase, we want to check if it is already in lowercase. We could do so using this code:<\/p>\n\n\n\n
email = input("What is your email address?")\n\nprint(email.isLower())<\/pre><\/div>\n\n\n\n
If we run our program and insert the email \u201caLex@gmail.com<\/a>\u201d, our code returns the following:<\/p>\n\n\n\n
What is your email address?\naLex@gmail.com\nFalse<\/pre><\/div>\n\n\n\n
The string \u201caLex@gmail.com<\/a>\u201d contains one uppercase character\u2014the L<\/em>\u2014and so the isLower()<\/em> method decided that it was False. Meanwhile, if we were to insert the email \u201calex@gmail.com<\/a>\u201d into our program, we would receive the following output:<\/p>\n\n\n\n
What is your email address?\nalex@gmail.com\nTrue<\/pre><\/div>\n\n\n\n
isLower()<\/em> will return True even if the string contains white space, digits, and\/or symbols. Only lowercase letters that are found in the string will cause isLower()<\/em> to evaluate it as False.<\/p>\n\n\n\n
Say we want to run a particular block of code depending on whether a string contains an uppercase character. We could do this using a Python “if” statement<\/a>.<\/p>\n\n\n\n
Consider the following code:<\/p>\n\n\n\n
if email.isLower():\n\tprint("This email is valid.")\nelse:\n\tprint("Email addresses can only contain lowercase characters.")<\/pre><\/div>\n\n\n\n
We use a Python if statement and the isLower() method to evaluate whether the user’s email only uses lowercase characters. If isLower() returns True, the “if” statement executes. Otherwise, our “else” statement executes.<\/p>\n\n\n\n
If we inserted the email “alex@gmail.com”, our code would return:<\/p>\n\n\n\n
This email is valid.<\/pre><\/div>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
The Python lower()<\/em> method can be used to convert a string into lowercase and return a revised copy of the string. The Python isLower()<\/em> function can be used to check whether a string contains an uppercase character.<\/p>\n\n\n\n
In this tutorial, we\u2019ve explored the two main Python lowercase methods: lower()<\/em> and isLower()<\/em>. We also examined a few examples of these methods in action. So now you have the knowledge you need to work with lowercase strings like a Python expert!<\/p>\n\n\n\n
If you’re interested in reading more about coding in Python, check out our complete How to Learn Python guide<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"The Python lower() function converts a string to all lowercase. The Python isLower() method will check if the alphabetical characters in a string are all lowercase and return True or False. The lower() and isLower() functions are useful for fields like email where all letters should be lowercase. When you\u2019re working with a string in…","protected":false},"author":240,"featured_media":12879,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16578],"tags":[],"class_list":{"0":"post-12878","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-python"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"Python","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":null,"is_sponser_post":"","is_guest_post":""},"yoast_head":"\nPython Lowercase: A Step-By-Step Guide | Career Karma<\/title>\n<meta name=\"description\" content=\"The Python lower method converts a string to lowercase, and isLower checks if a string is all lowercase. 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