[PyPI] Remove dill, pytest, pytest-xdist from end-user hard dependenc…

…ies (taichi-dev#1477)

python/taichi/lang/shell.py

@@ -67,7 +67,12 @@ def __init__(self):
 
         elif self.name == ShellType.NATIVE:
             # `dill.source` for "Python native shell"
-            import dill
+            try:
+                import dill
+            except ImportError as e:
+                raise ImportError(
+                    'In order to run Taichi in Python interactive shell, '
+                    'Please execute `python3 -m pip install --user dill`')
             self.getsource = dill.source.getsource
             self.getsourcelines = dill.source.getsourcelines
             self.getsourcefile = dill.source.getsourcefile

setup.py

@@ -19,36 +19,31 @@
 packages = setuptools.find_packages() + ['taichi.examples']
 print(packages)
 
-setuptools.setup(
-    name=project_name,
-    packages=packages,
-    version=version,
-    description='The Taichi Programming Language',
-    author='Yuanming Hu',
-    author_email='[email protected]',
-    url='https://github.com/taichi-dev/taichi',
-    install_requires=[
-        'numpy',
-        'pybind11>=2.5.0',
-        'colorama',
-        'setuptools',
-        'astor',
-        'dill',
-        # For testing:
-        'pytest',
-        'pytest-xdist',
-    ],
-    data_files=[('lib', data_files)],
-    keywords=['graphics', 'simulation'],
-    license='MIT',
-    include_package_data=True,
-    entry_points={
-        'console_scripts': [
-            'ti=taichi.main:main',
-            'tid=taichi.main:main_debug',
-        ],
-    },
-    classifiers=classifiers,
-    has_ext_modules=lambda: True)
+setuptools.setup(name=project_name,
+                 packages=packages,
+                 version=version,
+                 description='The Taichi Programming Language',
+                 author='Taichi developers',
+                 author_email='[email protected]',
+                 url='https://github.com/taichi-dev/taichi',
+                 install_requires=[
+                     'numpy',
+                     'pybind11>=2.5.0',
+                     'colorama',
+                     'setuptools',
+                     'astor',
+                 ],
+                 data_files=[('lib', data_files)],
+                 keywords=['graphics', 'simulation'],
+                 license='MIT',
+                 include_package_data=True,
+                 entry_points={
+                     'console_scripts': [
+                         'ti=taichi.main:main',
+                         'tid=taichi.main:main_debug',
+                     ],
+                 },
+                 classifiers=classifiers,
+                 has_ext_modules=lambda: True)
 
 # Note: this is a template setup.py used by python/build.py