Question

我觉得必须有一种更容易（更清晰）的方法来使用理解来解析linux上的meminfo文件。该文件的格式为：

MemTotal:        3045588 kB
MemFree:         1167060 kB
Buffers:          336752 kB
Cached:           721980 kB
SwapCached:            0 kB
Active:           843592 kB
Inactive:         752920 kB
Active(anon):     539968 kB
Inactive(anon):   134472 kB

我尝试重写for循环id，用于使用理解，发现我需要3个...

def parse_mem_file(memfile = '/proc/meminfo'):
    lines = open(memfile, 'r').readlines()
    lines = [line.strip('kB\n') for line in lines if line[-3:] == 'kB\n']
    lines = [line.split(':') for line in lines]
    return dict((key, int(value)) for (key, value) in lines)

print parse_mem_file()

我做错了什么？有没有合理的方法来简化这个？

Answer 1

d = {}
with open(f) as fin:
    for l in fin:
        x = l.split()
        d[x[0][:-1]] = int(x[1])
return d

Answer 2

我觉得这个版本更具可读性：

def parse_mem_file(memfile='/proc/meminfo'):
    data = {}
    with open(memfile, 'r') as f:
        for line in f:
            key, value, size = line.split()
            if size == 'kB':
                data[key[:-1]] = int(value)
    return data

Answer 3

另一个解决方案（注意我已经使用了字符串数据 - 因此在您的情况下，您需要修改代码以从文件中读取数据）：

data = """
MemTotal:        3045588 kB
MemFree:         1167060 kB
Buffers:          336752 kB
Cached:           721980 kB
SwapCached:            0 kB
Active:           843592 kB
Inactive:         752920 kB
Active(anon):     539968 kB
Inactive(anon):   134472 kB
"""

res = {}

for line in [x for x in d.split('\n') if x.strip() and ':' in x and 'kB' in x]:
    details = line.split()
    res[details[0][:-1]] = details[-2]

Answer 4

使用正则表达式和列表解析：

def parse_mem_file(memfile = '/proc/meminfo'):
    with open(memfile, 'r') as meminfo:
        return dict(
            (m.group(1), int(m.group(2)))
            for m in [re.match('(.+):\\s*(\\d+)', line) for line in meminfo]
            if m is not None)

Python理解整合

4 个答案: