MAINT: Bump minimum python version

Follow NEP and drop 3.7

Author: bashtage

INSTALL.txt

@@ -1,15 +1,15 @@
 Dependencies
 ------------
 
-python >= 3.7
+python >= 3.8
 
     www.python.org
 
-numpy >= 1.17
+numpy >= 1.18
 
     www.numpy.org
 
-scipy >= 1.3
+scipy >= 1.4
 
     www.scipy.org
 
@@ -21,7 +21,7 @@ patsy >= 0.5.2
 
     patsy.readthedocs.org
 
-cython >= 0.29.22
+cython >= 0.29.26
 
     https://cython.org/
 

docs/source/install.rst

@@ -15,7 +15,7 @@ Instructions for installing from PyPI, source or a development version are also
 Python Support
 --------------
 
-statsmodels supports Python 3.7, 3.8, and 3.9.
+statsmodels supports Python 3.8, 3.9, and 3.10.
 
 Anaconda
 --------
@@ -130,15 +130,15 @@ Dependencies
 
 The current minimum dependencies are:
 
-* `Python <https://www.python.org>`__ >= 3.7
-* `NumPy <https://www.scipy.org/>`__ >= 1.17
-* `SciPy <https://www.scipy.org/>`__ >= 1.3
+* `Python <https://www.python.org>`__ >= 3.8
+* `NumPy <https://www.scipy.org/>`__ >= 1.18
+* `SciPy <https://www.scipy.org/>`__ >= 1.4
 * `Pandas <https://pandas.pydata.org/>`__ >= 1.0
 * `Patsy <https://patsy.readthedocs.io/en/latest/>`__ >= 0.5.2
 
 Cython is required to build from a git checkout but not to run or install from PyPI:
 
-* `Cython <https://cython.org/>`__ >= 0.29 is required to build the code from
+* `Cython <https://cython.org/>`__ >= 0.29.26 is required to build the code from
   github but not from a source distribution.
 
 Given the long release cycle, statsmodels follows a loose time-based policy for

setup.py

@@ -98,9 +98,9 @@
     "Development Status :: 4 - Beta",
     "Environment :: Console",
     "Programming Language :: Cython",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
     "Operating System :: OS Independent",
     "Intended Audience :: End Users/Desktop",
     "Intended Audience :: Developers",
@@ -399,7 +399,7 @@ def is_pure(self):
     install_requires=INSTALL_REQUIRES,
     extras_require=EXTRAS_REQUIRE,
     zip_safe=False,
-    python_requires=">=3.7",
+    python_requires=">=3.8",
 )
 
 # Clean-up copied files

statsmodels/compat/pandas.py

@@ -60,7 +60,7 @@
 assert_series_equal = testing.assert_series_equal
 
 
-def is_int_index(index: pd.Index):
+def is_int_index(index: pd.Index) -> bool:
     """
     Check if an index is integral
 
@@ -81,7 +81,7 @@ def is_int_index(index: pd.Index):
     )
 
 
-def is_float_index(index):
+def is_float_index(index: pd.Index) -> bool:
     """
     Check if an index is floating
 

tools/ci/azure/azure_template_posix.yml

@@ -17,44 +17,44 @@ jobs:
   strategy:
     matrix:
       ${{ if eq(parameters.name, 'Linux') }}:
+        python_310_latest:
+          python.version: '3.10'
+          lint: true
         python_39:
           python.version: '3.9'
-          lint: true
-        python_38:
-          python.version: '3.8'
           USE_MATPLOTLIB: false
           USE_CVXOPT: false
           SCIPY: 1.5.4
-          PANDAS: 1.1.5
-          NUMPY: 1.19.5
+          PANDAS: 1.2.5
+          NUMPY: 1.20.3
           lint: true
-        python37:
-          python.version: '3.7'
+        python38:
+          python.version: '3.8'
           use.conda: true
-          PANDAS: 0.25.3
+          PANDAS: 1.0.5
           NUMPY: 1.18.5
           SCIPY: 1.4.1
           MATPLOTLIB: 3.2.2
           coverage: true
           PYTEST_OPTIONS: ''
-        python_37_legacy_blas:
-          python.version: '3.7'
+        python_38_legacy_blas:
+          python.version: '3.8'
           use.conda: true
           coverage: true
-          NUMPY: 1.17.4
-          PANDAS: 0.25.3
+          NUMPY: 1.18.5
+          PANDAS: 1.0.5
           MATPLOTLIB: 3.1.3
-          SCIPY: 1.3.2
+          SCIPY: 1.4.1
           BLAS: "nomkl blas=*=openblas"
           PYTEST_OPTIONS: ''
-        python38_numpy118:
-          python.version: '3.8'
-          NUMPY: 1.18.5
-          SCIPY: 1.3.3
-          PANDAS: 1.0.5
-          lint: true
-        python_39_pre:
+        python39_numpy119:
           python.version: '3.9'
+          NUMPY: 1.19.5
+          SCIPY: 1.4.1
+          PANDAS: 1.1.5
+          lint: true
+        python_310_pre:
+          python.version: '3.10'
           pip.pre: true
       ${{ if eq(parameters.name, 'macOS') }}:
         python39_macos_latest:

tools/ci/azure/azure_template_windows.yml

@@ -16,15 +16,15 @@ jobs:
     vmImage: ${{ parameters.vmImage }}
   strategy:
     matrix:
-      python37_win_latest:
-        python.version: '3.7'
-        python.architecture: 'x64'
       python38_win_latest:
         python.version: '3.8'
         python.architecture: 'x64'
       python39_win_latest:
         python.version: '3.9'
         python.architecture: 'x64'
+      python310_win_latest:
+        python.version: '3.10'
+        python.architecture: 'x64'
     maxParallel: 10
 
   steps:

tox.ini

@@ -17,9 +17,9 @@
 ##############################################################################
 [tox]
 envlist = 
-    py37
     py38
     py39
+    py310
     coverage
     cython-coverage