Question

Python 3.6

我有一个程序正在生成一个词典列表。

如果我将其打印到屏幕上：

print(json.dumps(output_lines, indent=4, separators=(',', ': ')))

它完全按照我想要的方式打印出来：

[
    {
        "runts": 0,     
        "giants": 0,     
        "throttles": 0,
        "input errors": 0,
        "CRC": 0,
        "frame": 0,
        "overrun": 0,
        "ignored": 0,
        "watchdog": 0,
        "pause input": 0,
        "input packets with dribble condition detected": 0,
        "underruns": 0,
        "output errors": 0,
        "collisions": 0,
        "interface resets": 2,
        "babbles": 0,
        "late collision": 0,
        "deferred": 0,
        "lost carrier": 0,
        "no carrier": 0,
        "PAUSE output": 0,
        "output buffer failures": 0,
        "output buffers swapped out": 0
    },
    {
        "runts": 0,
        "giants": 0,
        "throttles": 0,
        "input errors": 0,
        "CRC": 0,
        "frame": 0,
        "overrun": 0,
        "ignored": 0,
        "watchdog": 0,
        "pause input": 0,
        "input packets with dribble condition detected": 0,
        "underruns": 0,
        "output errors": 0,
        "collisions": 0,
        "interface resets": 2,
        "babbles": 0,
        "late collision": 0,
        "deferred": 0,
        "lost carrier": 0,
        "no carrier": 0,
        "PAUSE output": 0,
        "output buffer failures": 0,
        "output buffers swapped out": 0
    },

但是如果我尝试将其打印到一个文件：

outputfile = ("d:\\mark\\python\\Projects\\error_detect\\" + hostname)
# print(json.dumps(output_lines, indent=4, separators=(',', ': ')))
output_lines.append(json.dumps(output_lines, indent=4, separators=(',', ': ')))
del output_lines[-1]
with open(outputfile, 'w') as f:
    json.dump(output_lines, f)

该文件是一个巨大的文本行。

我希望文件中的格式与我在屏幕上打印时的格式相同。

我不明白为什么我会丢失格式。

Answer 1

我认为你所需要的只是json.dump indent而且应该没问题：

outputfile = ("d:\\mark\\python\\Projects\\error_detect\\" + hostname)
# print(json.dumps(output_lines, indent=4, separators=(',', ': ')))
# output_lines.append(json.dumps(output_lines, indent=4, separators=(',', ': ')))
# del output_lines[-1]
with open(outputfile, 'w') as f:
    json.dump(output_lines, f, indent=4, separators=(',', ': '))

格式化字符串然后在字符串上重新运行dump对我来说没有多大意义。

Answer 2

尝试简单地输出格式化的json.dumps，而不是再次通过json.dump运行。

with open(outputfile, 'w') as f:
    f.write(output_lines)

Answer 3

假设您的程序生成此词典列表

>>> list_of_dicts = [dict(zip(list(range(2)),list(range(2)))), dict(zip(list(range(2)),list(range(2))))]
>>> list_of_dicts
[{0: 0, 1: 1}, {0: 0, 1: 1}]

你能做的是

>>> import json
>>> str_object = json.dumps(list_of_dicts, indent=4)
>>> repr(str_object)
'[\n    {\n        "0": 0, \n        "1": 1\n    }, \n    {\n        "0": 0, \n        "1": 1\n    }\n]'
>>> str_object
[
    {
        "0": 0, 
        "1": 1
    }, 
    {
        "0": 0, 
        "1": 1
    }
]

现在你可以写str_object

了

>>> with open(outputfile, 'w') as f:
        f.write(str_object)

这使得文件中的格式与将其打印到屏幕时的格式相同。

将字典列表打印到文件中

3 个答案: