How Do I Escape Curly Braces in Python's .format() Method?

Formatting Strings with Curly Braces in Python

When using the .format() method to format strings, it's important to pay attention to the handling of curly-brace characters ({ and }) within the string. If you simply include curly braces in the string, they will be interpreted as placeholders for values, leading to errors or incorrect output.

To escape curly-brace characters and preserve them as literal text in the output, you need to double them up. This means using {{ and }} instead of { and }.

Example:

Consider the following non-working example:

print("{ Hello } {0}".format(42))

This will result in an error, as the curly braces are interpreted as placeholders that should contain a value.

To fix this, we need to escape the curly-brace characters by doubling them:

x = " {{ Hello }} {0} "
print(x.format(42))

This will produce the desired output:

{ Hello } 42

As explained in Python's documentation for format string syntax:

"Replacement fields" are surrounded by curly braces {}. Literal text is copied unchanged. To include a brace character in the literal text, it can be escaped by doubling: {{ and }}.

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