字典中提取子集 for python

 prices = {
'ACME': 45.23,
'AAPL': 612.78,
'IBM': 205.55,
'HPQ': 37.20,
'FB': 10.75
}
tech_names = {'AAPL', 'IBM', 'HPQ', 'MSFT'}

# 字典推导式中添加筛选条件
print({key: value for key, value in prices.items() if value > 200})
# 运行结果{'AAPL': 612.78, 'IBM': 205.55}

print({key: value for key, value in prices.items() if key in tech_names})
# 运行结果{'AAPL': 612.78, 'IBM': 205.55, 'HPQ': 37.2}