以下是一个示例代码，可以实现按组随机选择行的功能：

import random

def select_rows_by_group(data, group_column):
    # 将数据按组分组
    groups = {}
    for row in data:
        group = row[group_column]
        if group not in groups:
            groups[group] = []
        groups[group].append(row)
    
    # 随机选择每个组的一行
    selected_rows = []
    for group in groups.values():
        selected_row = random.choice(group)
        selected_rows.append(selected_row)
    
    return selected_rows

# 示例数据
data = [
    {"name": "John", "group": "A"},
    {"name": "Alice", "group": "A"},
    {"name": "Bob", "group": "B"},
    {"name": "Charlie", "group": "B"},
    {"name": "David", "group": "C"},
    {"name": "Eve", "group": "C"}
]

# 按组随机选择行
selected_rows = select_rows_by_group(data, "group")

# 输出结果
for row in selected_rows:
    print(row)

输出结果可能会有所不同，因为每次运行时随机选择的行可能不同。但是每个组中只会选择一行。