human
I wrote the below code

    if symtab:
        varset = symtab
    else:
        varset = {'p': sympy.Symbol('p'), 'g': sympy.Symbol('g'), 'e': sympy.E, 'i': sympy.I, 'Q': sympy.Symbol('Q'), 'I': sympy.Symbol('I'), 'N': sympy.Symbol('N'), 'ZZ': sympy.Symbol('ZZ'), 'XI': sympy.Symbol('XI'), 'hat': sympy.Function('hat')}
    if do_qubit:
        varset.update({'qubit': Qubit, 'Ket': Ket, 'dot': dot, 'bit': sympy.Function('bit')})
    if abcsym:
        for letter in string.lowercase:
            if (letter in varset):
                continue
            varset.update({letter: sympy.Symbol(letter, real=True)})
    sexpr = sympify(expr, locals=varset)
    if normphase:
        if isinstance(sexpr, list):
            if sexpr[0].is_number:
                ophase = sympy.sympify(('exp(-I*arg(%s))' % sexpr[0]))
                sexpr = [sympy.Mul(x, ophase) for x in sexpr]
    def to_matrix(expr):
        '\n                                Convert    a    list,    or    list    of    lists    to    a    matrix.\n                                '
        if (not isinstance(expr, list)):
            return expr
        for row in expr:
            if (not isinstance(row, list)):
                return expr
        rdim = len(expr[0])
        for row in expr:
            if (not (len(row) == rdim)):
                return expr
        return sympy.Matrix(expr)
    if matrix:
        sexpr = to_matrix(sexpr)
    return sexpr

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def my_sympify(expr, normphase=False, matrix=False, abcsym=False, do_qubit=False, symtab=None):