don't import stuff at genscript import time but rather when it is used

CHANGELOG

@@ -1,6 +1,9 @@
 Changes between 2.0.2 and 2.0.3.dev
 ----------------------------------------------
 
+- don't require zlib (and other libs) for genscript plugin without
+  --genscript actually being used.
+
 - speed up skips (by not doing a full traceback represenation
   internally)
 

_pytest/genscript.py

@@ -1,8 +1,5 @@
 """ generate a single-file self-contained version of py.test """
 import py
-import pickle
-import zlib
-import base64
 
 def find_toplevel(name):
     for syspath in py.std.sys.path:
@@ -31,9 +28,9 @@ def pkg_to_mapping(name):
     return name2src
 
 def compress_mapping(mapping):
-    data = pickle.dumps(mapping, 2)
-    data = zlib.compress(data, 9)
-    data = base64.encodestring(data)
+    data = py.std.pickle.dumps(mapping, 2)
+    data = py.std.zlib.compress(data, 9)
+    data = py.std.base64.encodestring(data)
     data = data.decode('ascii')
     return data
 
@@ -44,7 +41,6 @@ def compress_packages(names):
         mapping.update(pkg_to_mapping(name))
     return compress_mapping(mapping)
 
-
 def generate_script(entry, packages):
     data = compress_packages(packages)
     tmpl = py.path.local(__file__).dirpath().join('standalonetemplate.py')

pytest.py

@@ -1,7 +1,7 @@
 """
 unit and functional testing with Python.
 """
-__version__ = '2.0.3.dev0'
+__version__ = '2.0.3.dev1'
 __all__ = ['main']
 
 from _pytest.core import main, UsageError, _preloadplugins

setup.py

@@ -22,7 +22,7 @@ def main():
         name='pytest',
         description='py.test: simple powerful testing with Python',
         long_description = long_description,
-        version='2.0.3.dev0',
+        version='2.0.3.dev1',
         url='http://pytest.org',
         license='MIT license',
         platforms=['unix', 'linux', 'osx', 'cygwin', 'win32'],