Fix small errors

CHUNK_SIZE = 1024 * 1024  # 1 MB

with open("../data/wikipedia/wikipedia_corpus.txt", "rb", encoding="utf-8") as f:

with open("../data/wikipedia/wikipedia_corpus.txt", "rb") as f:

    CHUNK_NO = 1

    while True:

        print(f"reading Wikipedia data: approx. {CHUNK_NO} MB/8100 MB", end="\r")

            break

        for index, row in df.iterrows():

            name = row['name']

            name = row['name'].encode()

            count = wikipedia_text.count(name)

            df.at[index, "occurrences_in_wikipedia"] += count

        CHUNK_NO += 1

df.to_csv("./data/names_nationality_wikipedia.csv", index=False)

df.to_csv("../data/names_nationality_wikipedia.csv", index=False)

avg_occurrences = df.groupby("nationality")["occurrences_in_wikipedia"].mean()

for nationality, avg_count in avg_occurrences.items():