Replacement field

Definition

A replacement field is a placeholder within a formatted string that gets replaced by specific values during string formatting. It is denoted by curly braces {} and can include optional format specifications.

5 Must Know Facts For Your Next Test

1. Replacement fields are used within f-strings, the format() method, and template strings in Python.
2. Inside the curly braces, you can reference variables, expressions, or specify format codes for data representation.
3. Using f-strings allows for inline expression evaluation directly within the replacement fields.
4. The syntax for including a variable inside a replacement field in an f-string is {variable_name}.
5. Format specification mini-language can be used inside curly braces to control the display of values, such as {:.2f} for two decimal places.

Review Questions

• What symbol is used to denote a replacement field in Python?
• How can you include an expression within a replacement field in an f-string?
• What would be the output of the following code: `name = 'Alice'; print(f'Hello, {name}!')`?

Related terms

f-string: A string literal that is prefixed with 'f' or 'F' and allows embedding expressions inside curly braces.

.format() method: A method of the str class that performs string formatting by replacing fields enclosed in curly braces with specified values.

Format Specification Mini-Language: $A set of conventions$ for defining how data should be presented in formatted strings, such as alignment, width, and type.