python：增加东京橱柜商店的价值
我正在使用 tcdb 来保存大型键值存储。键是表示用户 ID 的字符串，值是以下形式的字典。
{'coord':0,'node':0,'way':0,'relation':0}
存储是通过迭代数据文件来填充的，该数据文件具有坐标、节点、路径和关系对象，每个对象都链接到特定用户。这是我用于增加字段的代码：
def increment(self,uid,typ):
uid = str(uid)
type = str(typ)
try:
self.cache[uid][typ] += 1
except KeyError:
try:
self.cache[uid][typ] = 1
except KeyError:
try:
print 'creating record for %s' % uid
self.cache[uid] = {'coord':0,'node':0,'way':0,'relation':0}
except KeyError:
print 'something\'s messed up'
这不起作用。我最终得到一个全为零值的表：
def result(self):
print 'cache is now %i records' % len(self.cache)
for key in self.cache:
print key + ': ' + str(self.cache[key])
收益率：
...
4951: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
409553: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
92274: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
259040: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
...
为什么？
最后一个异常永远不会被调用。
编辑 第一个 try 块中的代码：
tempdict = self.cache[uid]
tempdict[typ] = tempdict.get(typ,0) + 1
self.cache[uid] = tempdict
而不是原始
self.cache[uid][typ] += 1
作品，但对我来说看起来真的很难看。
I am using tcdb to hold a large key-value store. The keys are strings representing user IDs, the values are dicts of the form
{'coord':0,'node':0,'way':0,'relation':0}
The store is filled iterating over a data file that has coord, node, way and relation objects, each linked to a specific user. Here's my code for incrementing the fields:
def increment(self,uid,typ):
uid = str(uid)
type = str(typ)
try:
self.cache[uid][typ] += 1
except KeyError:
try:
self.cache[uid][typ] = 1
except KeyError:
try:
print 'creating record for %s' % uid
self.cache[uid] = {'coord':0,'node':0,'way':0,'relation':0}
except KeyError:
print 'something\'s messed up'
This does not work. I end up with a table that has all zero values:
def result(self):
print 'cache is now %i records' % len(self.cache)
for key in self.cache:
print key + ': ' + str(self.cache[key])
yields:
...
4951: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
409553: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
92274: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
259040: {'node': 0, 'coord': 0, 'relation': 0, 'way': 0}
...
Why?
The last exception is never called.
EDIT This code in the first try block:
tempdict = self.cache[uid]
tempdict[typ] = tempdict.get(typ,0) + 1
self.cache[uid] = tempdict
instead of the original
self.cache[uid][typ] += 1
works, but looks really ugly to me.
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continue
After this line:
Add this:
Also, please don't use
typeas a variable name as it hides the built-in of the same name.