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# Complexity Measures

Some measures of symbolic expression complexity. Each complexity measure is expected to take a symbolic expression as an argument, and return a number.

`sage.symbolic.complexity_measures.``string_length`(expr)

  Returns the length of `expr` after converting it to a string.

  INPUT:

  - `expr` – the expression whose complexity we want to measure.

  OUTPUT:

  A real number representing the complexity of `expr`.

  RATIONALE:

  If the expression is longer on-screen, then a human would probably consider it more complex.

  EXAMPLES:

  This expression has three characters, `x`, `^`, and `2`:

      sage: from sage.symbolic.complexity_measures import string_length
      sage: f = x^2
      sage: string_length(f)
      3

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