import pandas as pd

Nowcoder = pd.read_csv("Nowcoder.csv", sep=",")

print(Nowcoder.query("Num_of_exercise >= 500")[["Level", "Achievement_value"]])

# print(Nowcoder[Nowcoder.Num_of_exercise >= 500][["Level", "Achievement_value"]])

# print(Nowcoder.loc[Nowcoder["Num_of_exercise"] >= 500, ["Level", "Achievement_value"]])