在 python 中创建名称值对

Question

我有一个 python 脚本，它的以下输出存储在一个名为 jvmData 的变量中：

Stats name=jvmRuntimeModule, type=jvmRuntimeModule#
{
name=HeapSize, ID=1, description=The total memory (in KBytes) in the Java virtual machine run time., unit=KILOBYTE, type=BoundedRangeStatistic, lowWaterMark=1048576, highWaterMark=1048576, current=1048576, integral=0.0, lowerBound=1048576, upperBound=2097152

name=FreeMemory, ID=2, description=The free memory (in KBytes) in the Java virtual machine run time., unit=KILOBYTE, type=CountStatistic, count=348466

name=UsedMemory, ID=3, description=The amount of used memory (in KBytes) in the Java virtual machine run time., unit=KILOBYTE, type=CountStatistic, count=700109

name=UpTime, ID=4, description=The amount of time (in seconds) that the Java virtual machine has been running., unit=SECOND, type=CountStatistic, count=3706565

name=ProcessCpuUsage, ID=5, description=The CPU Usage (in percent) of the Java virtual machine., unit=N/A, type=CountStatistic, count=0
}

我想做的只是打印出重要部分的名称/值对，在这种情况下就是：

HeapSize=1048576
FreeMemory=348466
UsedMemory=700109
UpTime=3706565
ProcessCpuUsage=0

我对 python 一点也不擅长 :) 我脑子里唯一的解决方案似乎很啰嗦？拆分行，丢弃第一行、第二行和最后一行，然后以不同的情况（有时是当前的，有时是计数的）循环遍历每一行以查找字符串的长度等

也许（当然）我错过了一些不错的功能，我可以使用这些功能将它们放入相当于 java hashmap 之类的东西中？

Answer 1

“java HashMap 的等价物”在 python 中被称为字典。至于如何解析这个，只需遍历包含数据的行，对行中的所有键/值对进行字典，并为HeapSize 提供特殊情况：

jvmData = "..." #the string holding the data
jvmLines = jvmData.split("\n") #a list of the lines in the string
lines = [l.strip() for l in jvmLines if "name=" in l] #filter all data lines
result = {}
for line in lines:
    data = dict(s.split("=") for s in line.split(", "))
    #the value is in "current" for HeapSize or in "count" otherwise
    value = data["current"] if data["name"] == "HeapSize" else data["count"]
    result[data["name"]] = value

由于您似乎被困在 Jython2.1 上，这里有一个可以使用它的版本（显然未经测试）。与上面基本相同，但列表推导和生成器表达式分别替换为filter 和map，并且没有使用三元if/else 运算符：

jvmData = "..." #the string holding the data
jvmLines = jvmData.split("\n") #a list of the lines in the string
lines = filter(lambda x: "name=" in x, jvmLines) #filter all data lines
result = {}
for line in lines:
    data = dict(map(lambda x: x.split("="), line.split(", ")))
    if data["name"] == "HeapSize":
        result[data["name"]] = data["current"]
    else:
        result[data["name"]] = data["count"]

Answer 2

尝试使用 find 函数和小 re:

import re
final_map = {}
NAME= 'name='
COUNT= 'count='
HIGHWATERMARK= "highWaterMark="
def main():    
    with open(r'<file_location>','r') as file:
        lines = [line for line in file if re.search(r'^name', line)]        
        for line in lines:                    
            sub = COUNT if line.find(COUNT) != -1  else HIGHWATERMARK       
            final_map[line[line.find(NAME)+5:line.find(',')]] = line[line.find(sub)+len(sub):].split(',')[0].strip()
            print line[line.find(NAME)+5:line.find(',')]+'='+final_map[line[line.find(NAME)+5:line.find(',')]]                

if __name__ == '__main__':
    main()

输出：

HeapSize=1048576
FreeMemory=348466
UsedMemory=700109
UpTime=3706565
ProcessCpuUsage=0