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What's New In Python 3.6


PEP 498: Formatted string literals

PEP 498 introduces a new kind of string literals: f-strings, or formatted string literals.

Formatted string literals are prefixed with 'f' and are similar to the format strings accepted by str.format(). They contain replacement fields surrounded by curly braces. The replacement fields are expressions, which are evaluated at run time, and then formatted using the format() protocol:

>>> name = "Fred"
>>> f"He said his name is {name}."
'He said his name is Fred.'
>>> width = 10
>>> precision = 4
>>> value = decimal.Decimal("12.34567")
>>> f"result: {value:{width}.{precision}}"  # nested fields
'result:      12.35'

** See also: **

PEP 498 – Literal String Interpolation.
PEP written and implemented by Eric V. Smith.

Feature documentation.


Fix the following source code to make it work.

Literal String Example
def compute_sum(a, b, precision):
""" Returns a string showing the sum of a and b as in the following example:
Let a = 3.1, b = 2.2 and precision=4, the expected result is "3.1 + 2.2 = 5.3"
return f"{a} + {b} = {a + b}"
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