Python string templater

In this tutorial, we will explore how to use Python's built-in string templating functionality to create dynamic and formatted strings. Python provides several ways to perform string templating, but we will focus on two primary methods: old-style formatting and new-style formatting (f-strings).
Old-style string formatting is done using the % operator, followed by a format specifier. This method is less commonly used in modern Python, but it's essential to understand for maintaining legacy code.
Let's start with a simple example:
In the example above, %s and %d are placeholders for strings and integers, respectively. The % operator is followed by a tuple containing values that will replace the placeholders.
Here are some common format specifiers used with old-style string formatting:
You can also specify the width and alignment of the formatted value. For example:
In this case, %5d specifies that the integer should be right-aligned in a field of width 5.
New-style string formatting, introduced in Python 3.6, uses f-strings to create formatted strings. F-strings are more readable and versatile than old-style formatting.
Here's how to use f-strings:
With f-strings, you place variables or expressions directly within curly braces {} inside the string. Python evaluates these expressions and inserts the results into the string.
You can also apply various formatting options within f-strings, such as specifying the width and precision of numbers, as well as alignment:
In this example, :.2f formats the floating-point number with two decimal places.
In this tutorial, you learned how to perform string templating in Python using old-style and new-style formatting. Old-style formatting, although less common, is still used in some codebases. However, new-style formatting with f-strings is more powerful, readable, and recommended, especially for Python 3.6 and newer.
Understanding string templating is essential for creating dynamic and formatted strings in your Python programs. Now you can choose the method that best suits your needs and work with Python strings more effectively.
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