在pprint输出中禁用排序机制

Question

我有一个正在打印的大词典，可以用prettyprint查看，但是如何保持格式但又不能杀死pprint中的排序机制？

Answer 1

您可以猴子修补pprint模块。

import pprint

pprint.pprint({"def":2,"ghi":3,"abc":1,})
pprint._sorted = lambda x:x
# Or, for Python 3.7:
# pprint.sorted = lambda x, key=None: x
pprint.pprint({"def":2,"ghi":3, "abc":1})

由于第二个输出基本上是随机排序的，因此您的输出可能与我的不同：

{'abc': 1, 'def': 2, 'ghi': 3}
{'abc': 1, 'ghi': 3, 'def': 2}

---

另一个版本更复杂，但更易于使用：

import pprint
import contextlib

@contextlib.contextmanager
def pprint_nosort():
    # Note: the pprint implementation changed somewhere
    # between 2.7.12 and 3.7.0. This is the danger of
    # monkeypatching!
    try:
        # Old pprint
        orig,pprint._sorted = pprint._sorted, lambda x:x
    except AttributeError:
        # New pprint
        import builtins
        orig,pprint.sorted = None, lambda x, key=None:x

    try:
        yield
    finally:
        if orig:
            pprint._sorted = orig
        else:
            del pprint.sorted

# For times when you don't want sorted output
with pprint_nosort():
    pprint.pprint({"def":2,"ghi":3, "abc":1})

# For times when you do want sorted output
pprint.pprint({"def":2,"ghi":3, "abc":1})