如何在 Python 中使用 pprint 缩进?

How to indent with pprint in Python?

我正在尝试缩进 pprint 的输出,以便在 pprint 中得到 8 space 的缩进。我使用的代码是:

import numpy as np
from pprint import pprint
A = np.array([1, 2, 3, 4])
f = open("log.txt", 'w')
n = 2
for i in range(n):
    A = A + 1
    f.writelines(list(u'    \u27B3 - %s\n'.encode('utf-8') % i for i in A))
    pprint(globals())

输出

{'A': array([2, 3, 4, 5]),
 '__builtins__': <module '__builtin__' (built-in)>,
 '__doc__': None,
 '__file__': '~/Stack exchange/pprint_tab.py',
 '__name__': '__main__',
 '__package__': None,
 'f': <open file 'log.txt', mode 'w' at 0xb659b8b8>,
 'i': 0,
 'n': 2,
 'np': <module 'numpy' from '/usr/lib/python2.7/dist...,
 'pprint': <function pprint at 0xb6dea48c>}
{'A': array([3, 4, 5, 6]),
 '__builtins__': <module '__builtin__' (built-in)>,
 '__doc__': None,
 '__file__': '~/Stack exchange/pprint_tab.py',
 '__name__': '__main__',
 '__package__': None,
 'f': <open file 'log.txt', mode 'w' at 0xb659b8b8>,
 'i': 1,
 'n': 2,
 'np': <module 'numpy' from '/usr/lib/python2.7/dist...,
 'pprint': <function pprint at 0xb6dea48c>}

期望输出

        {'A': array([2, 3, 4, 5]),
         '__builtins__': <module '__builtin__' (built-in)>,
         '__doc__': None,
         '__file__': '~/Stack exchange/pprint_tab.py',
         '__name__': '__main__',
         '__package__': None,
         'f': <open file 'log.txt', mode 'w' at 0xb659b8b8>,
         'i': 0,
         'n': 2,
         'np': <module 'numpy' from '/usr/lib/python2.7/dist...,
         'pprint': <function pprint at 0xb6dea48c>}
        {'A': array([3, 4, 5, 6]),
         '__builtins__': <module '__builtin__' (built-in)>,
         '__doc__': None,
         '__file__': '~/Stack exchange/pprint_tab.py',
         '__name__': '__main__',
         '__package__': None,
         'f': <open file 'log.txt', mode 'w' at 0xb659b8b8>,
         'i': 1,
         'n': 2,
         'np': <module 'numpy' from '/usr/lib/python2.7/dist...,
         'pprint': <function pprint at 0xb6dea48c>}

简而言之,在写入文件或使用 pprint 打印时,我需要 space 缩进。我试过了

pp = pprint.PrettyPrinter(indent=8)

但是没用

您无法pprint()添加额外的前导缩进,不。

您最好的选择是改用 pprint.pformat() function,然后手动添加缩进:

from pprint import pformat

print ''.join([
    '        ' + l
    for l in pformat(globals()).splitlines(True)])

这使用 str.splitlines() methodpformat() 输出分成单独的行以便于重新加入。

在Python3中,缩进可以用textwrap.indent():

from pprint import pformat
from textwrap import indent

print(indent(pformat(globals()),
             '        '))

对 Martijn 的回答进行了小幅更新。无需在简单的 str concat 中使用 .format()。

from pprint import pformat

def left_indent(text, indent=' ' * 8):
    return ''.join([indent + l for l in text.splitlines(True)])

print(indent(pformat(data)))