def count_unknown_letters_in_expr()

in prm800k/grading/grader.py [0:0]

• 5 lines of code
• 3 McCabe index (conditional complexity)

def count_unknown_letters_in_expr(expr: str):
    expr = expr.replace("sqrt", "")
    expr = expr.replace("frac", "")
    letters_in_expr = set([x for x in expr if x.isalpha()])
    return len(letters_in_expr)