Warn deprecation at the beginning of file.

This way the deprecation message is shown when running 'python ez_setup.py'
or other methods (like when using 'exec' in buildout world, check
https://github.com/buildout/buildout/blob/9ba1e3170a474e6139c9a7eadd32a498c22cb3bb/bootstrap/bootstrap.py#L88
for more details).

The deprecation message was improved as well.

1 files changed, 3 insertions, 2 deletions

diff --git a/ez_setup.py b/ez_setup.py
index d15ce1da..800c31ef 100755
--- a/ez_setup.py
+++ b/ez_setup.py
@@ -20,7 +20,6 @@ import subprocess
 import platform
 import textwrap
 import contextlib
-import warnings
 
 from distutils import log
 
@@ -38,9 +37,12 @@ except ImportError:
 DEFAULT_VERSION = "33.1.1"
 DEFAULT_URL = "https://pypi.io/packages/source/s/setuptools/"
 DEFAULT_SAVE_DIR = os.curdir
+DEFAULT_DEPRECATION_MESSAGE = "ez_setup.py is deprecated and when using it setuptools will be pinned to {0} since it's the last version that supports setuptools self upgrade/installation, check https://github.com/pypa/setuptools/issues/581 for more info; use pip to install setuptools"
 
 MEANINGFUL_INVALID_ZIP_ERR_MSG = 'Maybe {0} is corrupted, delete it and try again.'
 
+log.warn(DEFAULT_DEPRECATION_MESSAGE.format(DEFAULT_VERSION))
+
 
 def _python_cmd(*args):
     """
@@ -409,5 +411,4 @@ def main():
     return _install(archive, _build_install_args(options))
 
 if __name__ == '__main__':
-    warnings.warn("ez_setup.py is deprecated, check https://github.com/pypa/setuptools/issues/581 for more info; use pip to install setuptools")
     sys.exit(main())