pandas python:如何根据列的条件进行追加？

import pandas as pd

# 创建一个空的DataFrame
df = pd.DataFrame(columns=['Name', 'Age', 'Gender'])

# 添加一些数据
df = df.append({'Name': 'Alice', 'Age': 25, 'Gender': 'Female'}, ignore_index=True)
df = df.append({'Name': 'Bob', 'Age': 30, 'Gender': 'Male'}, ignore_index=True)
df = df.append({'Name': 'Charlie', 'Age': 35, 'Gender': 'Male'}, ignore_index=True)

# 根据条件追加行
new_row = {'Name': 'David', 'Age': 40, 'Gender': 'Male'}
if new_row['Age'] > 30:
    df = df.append(new_row, ignore_index=True)

# 打印结果
print(df)

      Name Age  Gender
0    Alice  25  Female
1      Bob  30    Male
2  Charlie  35    Male
3    David  40    Male