PythonSyntax and keywords
f-strings
Strings with inserted expression values: f"You have {points} pts".
Example
#Python
name = "Emma"
points = 1240
accuracy = 0.8772
print(f"{name} has {points:,} points")
print(f"Accuracy: {accuracy:.1%}")
print(f"After bonus: {points * 1.1:.0f}")Resultsaved result, you can check it
Emma has 1,240 points
Accuracy: 87.7%
After bonus: 1364
Definition and usage
#An f-string is a string prefixed with the letter f, where curly braces let you insert any expression: a variable, a calculation, a function call. Python replaces it with text right where it sits.
After a colon inside the braces, you give the format: the number of decimal places ({avg:.2f}), a thousands separator ({n:,}), a percentage ({ratio:.0%}), or alignment ({name:<10}).
The notation {variable=} prints both the name and the value at once, which makes it much easier to quickly check values while debugging.
Syntax
#Syntax
f"text {expression} text {number:.2f}"More examples
#Python
rows = [("HTML", 11), ("Python", 12)]
for course, modules in rows:
print(f"{course:<8}|{modules:>3}")
level = 7
print(f"{level=}")Resultsaved result, you can check it
HTML | 11
Python | 12
level=7
Good practices
#- f-strings are more readable and faster than joining strings with
+andstr(). - For a thousands separator other than a comma, such as a space, use
{n:,}and then replace the comma:.replace(",", " ").
Related entries
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