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age = 32 print(f"Age: {age}") Thus concludes the lecture on f-strings.

• kzrdude 3mo ago
  I find it funny and satisfying that Python has converged to it's own "printf", by which I mean print(f"").
• layer8 3mo ago
  It’s unclear what the big advantage is over `print("Age: "+age)`. It’s even more characters, in that specific example.
  • kstrauser 3mo ago
    If age is a number, that won’t work.
    • layer8 3mo ago
      Admittedly I’m not so familiar with Python; it does work in Java. In that case, introducing a less hazardous string concatenation operator would seem more universally useful.
      • kstrauser 3mo ago
        In Python, that less hazardous string concatenation operator is an f-string.
        • layer8 3mo ago
          I’m assuming you can only use it with string literals, hence it is less universally useful.
          • TZubiri 3mo ago
            Nope, you can put expressions in them: f'{a} = {functionThatReturnsAButHasSideEffects()}'
  • mixmastamyk 3mo ago
    Toy examples aren’t the use case, rather multiple variables or expressions, perhaps with formatting (padding) as well. f-string is shorter, less err prone, and faster for medium complexity or above.
  • deleted 3mo ago
    [deleted]
  • andai 3mo ago
    >>> age = 32 >>> print("Age: " + age) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: can only concatenate str (not "int") to str >>> print("Age: " + str(age)) Age: 32 As a side note, I always found it amusing that Python is dynamic but doesn't let you do this, while C# has static typing but lets you do string + number. (I looked into it a while back, I think it's because both are Object, so it does operator overloading on Object+Object and then checks the types...)