BLD: Install scripts tests only during inplace

The scripts directory is not visible if the
installation is not inplace.

Follow-up to gh-20061.

Author: gfyoung

setup.py

@@ -435,6 +435,15 @@ def get_tag(self):
     # args to ignore warnings
     extra_compile_args = ['-Wno-unused-function']
 
+# If we're doing an inplace installation, the "scripts" directory is visible.
+# Thus, testing involving that directory should be "installed". Otherwise,
+# they should be excluded.
+for arg in ("develop", "-i", "--inplace"):
+    if arg in sys.argv:
+        exclude = []
+        break
+else:
+    exclude = ["pandas.tests.scripts"]
 
 # enable coverage by building cython files by setting the environment variable
 # "PANDAS_CYTHON_COVERAGE" (with a Truthy value) or by running build_ext
@@ -727,7 +736,8 @@ def srcpath(name=None, suffix='.pyx', subdir='src'):
 setup(name=DISTNAME,
       maintainer=AUTHOR,
       version=versioneer.get_version(),
-      packages=find_packages(include=['pandas', 'pandas.*']),
+      packages=find_packages(include=['pandas', 'pandas.*'],
+                             exclude=exclude),
       package_data={'': ['templates/*', '_libs/*.dll']},
       ext_modules=maybe_cythonize(extensions, compiler_directives=directives),
       maintainer_email=EMAIL,