Python在生物信息学中的应用：字典推导式

prices = {
'ACME': 45.23,
'AAPL': 612.78,
'IBM': 205.55,
'HPQ': 37.20,
'FB': 10.75
}
# 依据值过滤
p1 = {key: value for key, value in prices.items() if value > 200}
# 依据键过程
tech_names = {'AAPL', 'IBM', 'HPQ', 'MSFT'}
p2 = {key: value for key, value in prices.items() if key in tech_names}

p1 = dict((key, value) for key, value in prices.items() if value > 200

# 依据键过程
tech_names = { 'AAPL', 'IBM', 'HPQ', 'MSFT' }
p2 = { key:prices[key] for key in prices.keys() & tech_names }