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gh-154675: pprint use lazy imports by edvilme · Pull Request #156803 · python/cpython · GitHub

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gh-154675: pprint use lazy imports #156803

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gh-154675: pprint use lazy imports #156803

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928cb08
gh-154675: pprint use lazy imports
edvilme Sep 1, 2026
82d7d1f
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 1, 2026
e055683
Use private imports
edvilme Sep 2, 2026
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19 changes: 8 additions & 11 deletions Lib/pprint.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,10 @@
import types as _types
from io import StringIO as _StringIO

lazy from dataclasses import is_dataclass as _is_dataclass
lazy from dataclasses import fields as _dataclass_fields
lazy import re as _re

__all__ = ["pprint","pformat","isreadable","isrecursive","saferepr",
"PrettyPrinter", "pp"]

Expand Down Expand Up @@ -197,15 +201,14 @@ def _format(self, object, stream, indent, allowance, context, level):
max_width = self._width - indent - allowance
if len(rep) > max_width:
p = self._dispatch.get(type(object).__repr__, None)
# Lazy import to improve module import time
from dataclasses import is_dataclass


if p is not None:
context[objid] = 1
p(self, object, stream, indent, allowance, context, level + 1)
del context[objid]
return
elif (is_dataclass(object) and
elif (_is_dataclass(object) and
not isinstance(object, type) and
object.__dataclass_params__.repr and
# Check dataclass has generated repr method.
Expand Down Expand Up @@ -240,15 +243,12 @@ def _write_indent_padding(self, write):
write((self._indent_per_level - 1) * " ")

def _pprint_dataclass(self, object, stream, indent, allowance, context, level):
# Lazy import to improve module import time
from dataclasses import fields as dataclass_fields

cls_name = object.__class__.__name__
if self._expand:
indent += self._indent_per_level
else:
indent += len(cls_name) + 1
items = [(f.name, getattr(object, f.name)) for f in dataclass_fields(object) if f.repr]
items = [(f.name, getattr(object, f.name)) for f in _dataclass_fields(object) if f.repr]
stream.write(self._format_block_start(cls_name + '(', indent))
self._format_namespace_items(items, stream, indent, allowance, context, level)
stream.write(self._format_block_end(')', indent - self._indent_per_level))
Expand Down Expand Up @@ -422,11 +422,8 @@ def _pprint_str(self, object, stream, indent, allowance, context, level):
if len(rep) <= max_width1:
chunks.append(rep)
else:
# Lazy import to improve module import time
import re

# A list of alternating (non-space, space) strings
parts = re.findall(r'\S*\s*', line)
parts = _re.findall(r'\S*\s*', line)
assert parts
assert not parts[-1]
parts.pop() # drop empty last part
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-09-01-23-24-34.gh-issue-154675.hmvwgW.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Use lazy imports instead of inline imports in pprint
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