pprint — 漂亮的打印数据结构

# pprint_data.py
data = [
    (1, {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'}),
    (2, {'e': 'E', 'f': 'F', 'g': 'G', 'h': 'H',
         'i': 'I', 'j': 'J', 'k': 'K', 'l': 'L'}),
    (3, ['m', 'n']),
    (4, ['o', 'p', 'q']),
    (5, ['r', 's', 't''u', 'v', 'x', 'y', 'z']),
]

打印

# pprint_pprint.py
from pprint import pprint

from pprint_data import data

print('PRINT:')
print(data)
print()
print('PPRINT:')
pprint(data)

格式化

# pprint_pformat.py
import logging
from pprint import pformat
from pprint_data import data

logging.basicConfig(
    level=logging.DEBUG,
    format='%(levelname)-8s %(message)s',
)

logging.debug('Logging pformatted data')
formatted = pformat(data)
for line in formatted.splitlines():
    logging.debug(line.rstrip())

任意类

# pprint_arbitrary_object.py
from pprint import pprint


class node:

    def __init__(self, name, contents=[]):
        self.name = name
        self.contents = contents[:]

    def __repr__(self):
        return (
            'node(' + repr(self.name) + ', ' +
            repr(self.contents) + ')'
        )


trees = [
    node('node-1'),
    node('node-2', [node('node-2-1')]),
    node('node-3', [node('node-3-1')]),
]
pprint(trees)

递归

# pprint_recursion.py
from pprint import pprint

local_data = ['a', 'b', 1, 2]
local_data.append(local_data)

print('id(local_data) =>', id(local_data))
pprint(local_data)

限制嵌套输出

# pprint_depth.py
from pprint import pprint

from pprint_data import data

pprint(data, depth=1)
pprint(data, depth=2)

控制输出宽度

# pprint_width.py
from pprint import pprint

from pprint_data import data

for width in [80, 5]:
    print('WIDTH =', width)
    pprint(data, width=width)
    print()

# pprint_compact.py
from pprint import pprint

from pprint_data import data

print('DEFAULT:')
pprint(data, compact=False)
print('\nCOMPACT:')
pprint(data, compact=True)