print(f"{person}:") SyntaxError: invalid syntax when running it

[AryaIC]

Hello all...,

I'm beginner in python and have been trying to fix this but I'm lost. So please help me. I got this ^
SyntaxError: invalid syntax print(f"{person}:") when I ran it in PyCharm. The code:

import csv
import itertools
import sys

PROBS = {

    "gene": {
        2: 0.01,
        1: 0.03,
        0: 0.96
    },

    "trait": {

        2: {
            True: 0.65,
            False: 0.35
        },

        1: {
            True: 0.56,
            False: 0.44
        },

        0: {
            True: 0.01,
            False: 0.99
        }
    },

    "mutation": 0.01
}


def main():
    if len(sys.argv) != 2:
        sys.exit("Usage: python heredityarya.py data.csv")
    people = load_data(sys.argv[1])

    probabilities = {
        person: {
            "gene": {
                2: 0,
                1: 0,
                0: 0
            },
            "trait": {
                True: 0,
                False: 0
            }
        }
        for person in people
    }

    names = set(people)
    for have_trait in powerset(names):

        fails_evidence = any(
            (people[person]["trait"] is not None and
             people[person]["trait"] != (person in have_trait))
            for person in names
        )
        if fails_evidence:
            continue

        for one_gene in powerset(names):
            for two_genes in powerset(names - one_gene):

                p = joint_probability(people, one_gene, two_genes, have_trait)
                update(probabilities, one_gene, two_genes, have_trait, p)

    normalize(probabilities)

    for person in people:
        [b]print(f" {person}:")[/b]
        for field in probabilities[person]:
            print(f"  {field.capitalize()}:")
            for value in probabilities[person][field]:
                p = probabilities[person][field][value]
                print(f"    {value}: {p:.4f}")

def load_data(filename):
    data = dict()
    with open(filename) as f:
        reader = csv.DictReader(f)
        for row in reader:
            name = row["name"]
            data[name] = {
                "name": name,
                "mother": row["mother"] or None,
                "father": row["father"] or None,
                "trait": (True if row["trait"] == "1" else
                          False if row["trait"] == "0" else None)
            }
    return data


def powerset(s):
    s = list(s)
    return [
        set(s) for s in itertools.chain.from_iterable(
            itertools.combinations(s, r) for r in range(len(s) + 1)
        )
    ]


def joint_probability(people, one_gene, two_genes, have_trait):
    probability = 1
    for person in people:

        num_genes = num_genes_of_person(person, one_gene, two_genes)

        has_trait = person in have_trait

        if people[person]['mother'] is None and people[person]['father'] is None:
            probability *= PROBS["gene"][num_genes] * PROBS["trait"][num_genes][has_tr

            else:
            num_genes_mother = num_genes_of_person(people[person]['mother'], one_gene
            num_genes_father = num_genes_of_person(people[person]['father'], one_gene

            if num_genes == 0:
                probability *= probability_inheritence(num_genes_mother, False) * prob

            elif num_genes == 1:
                probability *= probability_inheritence(num_genes_mother, True) * proba
                               + probability_inheritence(num_genes_mother, False) *

            elif num_genes == 2:
                probability *= probability_inheritence(num_genes_mother, True) * proba

            probability *= PROBS["trait"][num_genes][has_trait]
    return probability

def update(probabilities, one_gene, two_genes, have_trait, p):
    for person in probabilities:

        num_genes = num_genes_of_person(person, one_gene, two_genes)

        has_trait = person in have_trait

        probabilities[person]["gene"][num_genes] += p
        probabilities[person]["trait"][has_trait] += p

def normalize(probabilities):
    for person in probabilities:
        trait_sum = sum(probabilities[person]["trait"].values())
        gene_sum = sum(probabilities[person]["gene"].values())

        for gene in probabilities[person]["gene"]:
            probabilities[person]["gene"][gene] /= gene_sum

        for trait in probabilities[person]["trait"]:
            probabilities[person]["trait"][trait] /= trait_sum

if __name__ == "__main__":
    main()

Why print(f"{person}:") is invalid syntax? What changes should I make on this?
And I got No such file or directory when I ran it in Visual Studio Code. What did I miss?

Many thanks in advance.