在python中聚合键值对 [英] Aggregating key value pair in python
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问题描述
我有一个与python代码有关的问题. 如果密钥= kv1,我需要汇总,该怎么办?
I have a question related to python code. I need to aggregate if the key = kv1, how can I do that?
input='num=123-456-7890&kv=1&kv2=12&kv3=0'
result={}
for pair in input.split('&'):
(key,value) = pair.split('=')
if key in 'kv1':
print value
result[key] += int(value)
print result['kv1']
非常感谢!
推荐答案
我假设您的意思是key == 'kv1'
,并且input
中的kv
也应该是kv1
,而result
是不需要result[key] += int(value)
只是result[key] = int(value)
I'm assuming you meant key == 'kv1'
and also the kv
within input
was meant to be kv1
and that result
is an empty dict
that doesn't need result[key] += int(value)
just result[key] = int(value)
input = 'num=123-456-7890&kv1=1&kv2=12&kv3=0'
keys = {k: v for k, v in [i.split('=') for i in input.split('&')]}
print keys # {'num': '123-456-7890', 'kv2': '12', 'kv1': '1', 'kv3': '0'}
result = {}
for key, value in keys.items():
if key == 'kv1':
# if you need to increase result['kv1']
_value = result[key] + int(value) if key in result else int(value)
result[key] = _value
# if you need to set result['kv1']
result[key] = int(value)
print result # {'kv1': 1}
假设您有多行数据,例如:
Assuming you have multiple lines with data like:
num=123-456-7890&kv1=2&kv2=12&kv3=0
num=123-456-7891&kv1=1&kv2=12&kv3=0
num=123-456-7892&kv1=4&kv2=12&kv3=0
逐行读取文件中的内容:
Reading line-by-line in a file:
def get_key(data, key):
keys = {k: v for k, v in [i.split('=') for i in data.split('&')]}
for k, v in keys.items():
if k == key: return int(v)
return None
results = []
for line in [line.strip() for line in open('filename', 'r')]:
value = get_key(line, 'kv1')
if value:
results.append({'kv1': value})
print results # could be [{'kv1': 2}, {'kv1': 1}, {'kv1': 4}]
或仅一个string
:
with open('filename', 'r') as f: data = f.read()
keys = {k: v for k, v in [i.split('=') for i in data.split('&')]}
result = {}
for key, value in keys.items():
if key == 'kv1':
result[key] = int(value)
控制台I/O:
c:\nathan\python\bnutils>python
Python 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> def get_key(data, key):
... keys = {k: v for k, v in [i.split('=') for i in data.split('&')]}
... for k, v in keys.items():
... if k == key: return int(v)
... return None
...
>>> results = []
>>> for line in [line.strip() for line in open('test.txt', 'r')]:
... value = get_key(line, 'kv1')
... if value:
... results.append({'kv1': value})
...
>>> print results
[{'kv1': 2}, {'kv1': 1}, {'kv1': 4}]
>>>
test.txt:
num=123-456-7890&kv1=2&kv2=12&kv3=0
num=123-456-7891&kv1=1&kv2=12&kv3=0
num=123-456-7892&kv1=4&kv2=12&kv3=0
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