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[英]Iterate over list of dictionaries and find matching elements from a list and append value of matching key to defaultdict
[英]Iterating over key and value of defaultdict dictionaries
預期的工作如下:
d = [(1,2), (3,4)]
for k,v in d:
print "%s - %s" % (str(k), str(v))
但這失敗了:
d = collections.defaultdict(int)
d[1] = 2
d[3] = 4
for k,v in d:
print "%s - %s" % (str(k), str(v))
帶有:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
為什么? 我該如何解決?
您需要遍歷dict.iteritems()
:
for k,v in d.iteritems(): # will become d.items() in py3k
print "%s - %s" % (str(k), str(v))
更新:在py3 V3.6 +中
for k,v in d.items():
print (f"{k} - {v}")
如果您使用的是Python 3.6
from collections import defaultdict
for k, v in d.items():
print(f'{k} - {v}')
如果要遍歷單個集合中的單個項目:
from collections import defaultdict
for k, values in d.items():
for value in values:
print(f'{k} - {value}')
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