[英]Function with dictionaries as optional arguments - Python
我正在嘗試創建一個可能作為輸入接收多個或幾個字典的函數。 我正在使用以下代碼:
def merge_many_dics(dic1,dic2,dic3=True,dic4=True,dic5=True,dic6=True,dic7=True,dic8=True,dic9=True,dic10=True):
"""
Merging up to 10 dictionaries with same keys and different values
:return: a dictionary containing the common dates as keys and both values as values
"""
manydics = {}
for k in dic1.viewkeys() & dic2.viewkeys() & dic3.viewkeys() & dic4.viewkeys() & dic5.viewkeys() & dic6.viewkeys()\
& dic7.viewkeys() & dic8.viewkeys() & dic9.viewkeys() & dic10.viewkeys():
manydics[k] = (dic1[k], dic2[k],dic3[k],dic4[k],dic5[k],dic6[k],dic7[k],dic8[k],dic9[k],dic10[k])
return manydics
請注意,我試圖將參數dic3,dic4,dic5等等於“True”,因此當它們未被指定並且在函數中被調用時,沒有任何反應。 但是我收到以下錯誤:
Traceback (most recent call last):
File "/Users/File.py", line 616, in <module>
main_dic=merge_many_dics(dic1,dic2,dic3,dic4)
File "/Users/File.py", line 132, in merge_many_dics
& dic7.viewkeys() & dic8.viewkeys() & dic9.viewkeys() & dic10.viewkeys():
AttributeError: 'bool' object has no attribute 'viewkeys'
有人為我的旅程提供服務嗎?
使用任意參數列表 ,可以使用任意數量的參數調用該函數:
>>> def merge_many_dics(*dicts):
... common_keys = reduce(lambda a, b: a & b, (d.viewkeys() for d in dicts))
... return {key: tuple(d[key] for d in dicts) for key in common_keys}
...
>>> merge_many_dics({1:2}, {1:3}, {1:4, 2:5})
{1: (2, 3, 4)}
你應該嘗試args語法:
def merge_many_dics(*args):
iterate over your args to join them
那么你可以使用任意數量的參數調用函數。
帶* args的函數可以如下:
def print_all(name, *args):
print "Hello", name, "here are your args"
for arg in args:
print arg
print_all("Claus", "car", "boat", "house")
這將打印:
Hello Clause here are your args
car
boat
house
這是基於@falsetru回答並使用operator.and_
函數的Python 3.x答案。
>>> from functools import reduce
>>> import operator
>>> def merge_many_dicts(*dicts):
... common_keys = reduce(operator.and_, (d.keys() for d in dicts))
... return {key: tuple(d[key] for d in dicts) for key in common_keys}
...
>>> merge_many_dicts({1:2}, {1:3}, {1:4, 2:5})
{1: (2, 3, 4)}
正如錯誤所說,你無法查看布爾值的鍵,也就是說,True.viewkeys()不起作用。 將您的默認字典更改為空,留下:
def merge_many_dics(dic1,dic2,dic3={},dic4={},dic5={},dic6={},dic7={},dic8={},dic9={},dic10={}):
"""
Merging up to 10 dictionaries with same keys and different values
:return: a dictionary containing the common dates as keys and both values as values
"""
manydics = {}
for k in dic1.viewkeys() & dic2.viewkeys() & dic3.viewkeys() & dic4.viewkeys() & dic5.viewkeys() & dic6.viewkeys()\
& dic7.viewkeys() & dic8.viewkeys() & dic9.viewkeys() & dic10.viewkeys():
manydics[k] = (dic1[k], dic2[k],dic3[k],dic4[k],dic5[k],dic6[k],dic7[k],dic8[k],dic9[k],dic10[k])
return manydics
這是一個實現,您可以在其中為每個鍵創建一個列表並添加每個項目,我確信它可以進行更多優化,但它非常易讀:
def merge_many_dicts(*args):
"""
Merging all dictionaries suposing all dictionaries share keys
:return: a dictionary containing the common dates as keys and both values as values
"""
manydicts = {}
for k in args:
for key in k.iterkeys():
manydicts[key] = []
for k in args:
for key, value in k.iteritems():
manydicts[key].append(value)
return manydicts
您可以使用以下代碼在函數中初始化這些參數
def merge_many_dics(dic1, dic2, dic3=None, dic4=None, dic5=None, dic6=None, dic7=None, dic8=None, dic9=None,
dic10=None):
"""
Merging up to 10 dictionaries with same keys and different values
:return: a dictionary containing the common dates as keys and both values as values
"""
for item in locals().items():
if item is None:
item = dic1
manydics = {}
for k in dic1.viewkeys() & dic2.viewkeys() & dic3.viewkeys() & dic4.viewkeys() & dic5.viewkeys() & dic6.viewkeys() \
& dic7.viewkeys() & dic8.viewkeys() & dic9.viewkeys() & dic10.viewkeys():
manydics[k] = (dic1[k], dic2[k], dic3[k], dic4[k], dic5[k], dic6[k], dic7[k], dic8[k], dic9[k], dic10[k])
return manydics
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