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Defer setuptools import to save ~60ms on startup

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(I ran this 5 times and picked a median result)

### before

```console
$ time flake8 --help > /dev/null

real    0m0.221s
user    0m0.199s
sys     0m0.020s
```

### after

```console
$ time flake8 --help > /dev/null

real    0m0.169s
user    0m0.144s
sys     0m0.020s
```
This commit is contained in:
Anthony Sottile 2018-10-14 21:45:58 -07:00
parent 9631dac52a
commit 6a610cb5d6
1 changed files with 3 additions and 2 deletions
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5
src/flake8/main/debug.py
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@ -4,8 +4,6 @@ from __future__ import print_function
import json import json
import platform import platform
import setuptools
def print_information(option, option_string, value, parser, def print_information(option, option_string, value, parser,
option_manager=None): option_manager=None):
@ -65,4 +63,7 @@ def plugins_from(option_manager):
def dependencies(): def dependencies():
"""Generate the list of dependencies we care about.""" """Generate the list of dependencies we care about."""
# defer this expensive import, not used outside --bug-report
import setuptools
return [{'dependency': 'setuptools', 'version': setuptools.__version__}] return [{'dependency': 'setuptools', 'version': setuptools.__version__}]