> name = 'Elizabeth' > t = Template ( 'Hey $name!' ) > t. Pad number with zeros (left padding, width 2) These strings may contain replacement fields, which are expressions delimited by curly braces " # '81.66%' Number formatting table Number Handles numbers in the same way as zfill().A formatted string literal or f-string is a string literal that is prefixed with `f` or `F`. = Right-aligned except for the sign, which is left-aligned.The alignment modifier defines whether the value is The width modifier defines the minimum total field width of a field, including any prefixes, separators, and other formatting characters. This is particularly useful if you want the string output to look neat and be tabulation-friendly. These modifiers help us format unpredictable-length variables to fit a fixed width. Python’s Formatting Mini-Language Syntax: The Details Alignment, Fill, and Width Modifiers General decimal format - fixed point for smaller numbers, scientific notation for larger numbers. For types b, o, x, and X, underscore will be inserted every 4 digits.ĭefines the comma as a thousands separator.ĭefines digits after the point for types f and F, total digits for types g and G, or maximum characters displayed for strings. (It is also available in versions 2.7 and onward.) It essentially functions by linking placeholders marked by curly braces ".format(124))ĭefines the underscore as a thousands separator. The String.format() function is a powerful and flexible string formatting tool introduced in Python 3. If any of the terms above (such as variable or function) are unfamiliar to you, please read Python Terms Beginners Should Know – Part 1 and Python Terms Beginners Should Know – Part 2 before continuing this article. As of Python 3, string formatting is performed chiefly using the format() function, which belongs to the String class. The python format() method is an effective way of. We won’t be spending any more time talking about it – except to mention that it could be useful when dealing with older versions of Python. The python format() method will return a formatted value as specified by the format passed as a parameter. This outdated method has been explicitly disavowed in the Python 3 documentation because it’s error-prone and outdated. > print("Lorem %s dolor sit %s." % ("ipsum", "amet")) Its usage primarily consisted of adding a C-style placeholder in the string where a variable should go and then linking to it by appending the variable references to the string using %. will mostly be responses to bug reports and support for new Python syntax. > print("customer_name ordered a order_name for price with a tip_percentage tip")Ĭustomer_name ordered a order_name for price with a tip_percentage tipīefore the introduction of Python 3, string formatting was mainly achieved through the % operator. Formatting becomes transparent after a while and you can focus on the content. What happens when we need to read the customer’s name, their order, its price, and the tip amount from variables? In this snippet, we are printing the details of an order in a pizza restaurant. John ordered a Pepperoni Pizza for $4.25 with a 15% tip > print("John ordered a Pepperoni Pizza for $4.25 with a 15% tip") Take, for instance, the code snippet below: After all, all the ubiquitous “Hello World!” really does is print one string:Ĭomplications arise, however, when we need to introduce dynamic data – meaning data that may change over time or with each execution. Working with strings is one of the first things any developer learns to do as such, it seems as if it should be one of the simplest. (Check out this article if you’ll also be manipulating strings in SQL.) What is String Formatting in Python? Today you will learn about how Python handles string formatting, or the art of combining a string with dynamic data in such a way that it is easily legible by either a human reader or an expecting machine. You may know all kinds of ways to manually manipulate strings in Python – maybe you learned from our Working with Strings in Python course (part of the Python Basics track). Everything you need to know about formatting strings in Python and the Python formatting mini-language.
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