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Which Python module reads and writes CSV files without installing anything?

customer = {“name”: “Alice”, “age”: 30}print(customer[“name”])

inventory = [“apples”,”bananas”]inventory.append(“oranges”)inventory.remove(“bananas”)print(inventory)

What does df.head() return?

df = pd.DataFrame({“dept”:[“HR”,”IT”,”HR”,”IT”],”salary”:[60000,90000,65000,95000]})print(df.groupby(“dept”)[“salary”].mean())

df = pd.DataFrame({“name”:[“Alice”,”Bob”,”Carol”],”score”:[85,72,91]})result = df[df[“score”] > 80]print(result[“name”].values)

Angular cheilitis is commonly associated with

Which method fills missing values with a specified value?

Gross chromosomal abnormalities are most commonly caused by

What is Seaborn built on top of?