我想做的事情是:
foo = {
'foo': 1,
'zip': 2,
'zam': 3,
'bar': 4
}
if ("foo", "bar") in foo:
#do stuff
我如何检查是否foo和酒吧都在dict foo?
我想做的事情是:
foo = {
'foo': 1,
'zip': 2,
'zam': 3,
'bar': 4
}
if ("foo", "bar") in foo:
#do stuff
我如何检查是否foo和酒吧都在dict foo?
当前回答
你可以这样做:
>>> if all(k in foo for k in ("foo","bar")):
... print "They're there!"
...
They're there!
其他回答
如果你想:
还可以获取键的值 多查字典
然后:
from operator import itemgetter
foo = {'foo':1,'zip':2,'zam':3,'bar':4}
keys = ("foo","bar")
getter = itemgetter(*keys) # returns all values
try:
values = getter(foo)
except KeyError:
# not both keys exist
pass
这只是我的看法,在所有给定的选项中,有两个方法很容易理解。所以我的主要标准是代码可读性强,而不是特别快。为了保持代码的可理解性,我更喜欢给定的可能性:
var <=var2.keys() var.issubset(var2)
事实上,“var <= var2.keys()”在我下面的测试中执行得更快,我更喜欢这个。
import timeit
timeit.timeit('var <= var2.keys()', setup='var={"managed_ip", "hostname", "fqdn"}; var2= {"zone": "test-domain1.var23.com", "hostname": "bakje", "api_client_ip": "127.0.0.1", "request_data": "", "request_method": "GET", "request_url": "hvar2p://127.0.0.1:5000/test-domain1.var23.com/bakje", "utc_datetime": "04-Apr-2019 07:01:10", "fqdn": "bakje.test-domain1.var23.com"}; var={"managed_ip", "hostname", "fqdn"}')
0.1745898080000643
timeit.timeit('var.issubset(var2)', setup='var={"managed_ip", "hostname", "fqdn"}; var2= {"zone": "test-domain1.var23.com", "hostname": "bakje", "api_client_ip": "127.0.0.1", "request_data": "", "request_method": "GET", "request_url": "hvar2p://127.0.0.1:5000/test-domain1.var23.com/bakje", "utc_datetime": "04-Apr-2019 07:01:10", "fqdn": "bakje.test-domain1.var23.com"}; var={"managed_ip", "hostname", "fqdn"};')
0.2644960229999924
my_dict = {
'name': 'Askavy',
'country': 'India',
'age': 30
}
if set(('name', 'country','age')).issubset(my_dict.keys()):
print("All keys are present in the dictionary")
else:
print("All keys are not present in the dictionary")
这应该可以工作:
if all(key in foo for key in ["foo","bar"]):
# do stuff
pass
提示:
在all()中使用方括号来创建一个列表推导式:
if all([key in foo for key in ["foo","bar"]]):
不仅是不必要的,而且是非常有害的,因为它们阻碍了all()的正常短路行为。
>>> ok
{'five': '5', 'two': '2', 'one': '1'}
>>> if ('two' and 'one' and 'five') in ok:
... print "cool"
...
cool
这似乎有用