Use sys.executable instead of hardcoded "python" (#59)

* Use sys.executable instead of hardcoded pyhton

* update requirements for pymssql

* update version to 0.7.3

Python/buildandinstall.cmd

@@ -1,2 +1,2 @@
 python.exe setup.py sdist --formats=zip
-python.exe -m pip install --upgrade --upgrade-strategy only-if-needed dist\sqlmlutils-0.7.2.zip
+python.exe -m pip install --upgrade --upgrade-strategy only-if-needed dist\sqlmlutils-0.7.3.zip

Python/requirements.txt

@@ -1,5 +1,5 @@
 pip>=9.0.1
-pymssql>=2.1.4
+pymssql>=2.1.4,<3.0
 dill>=0.2.6
 pkginfo>=1.4.2
 requirements-parser>=0.2.0

Python/setup.py

@@ -6,7 +6,7 @@ from setuptools import setup
 setup(
     name='sqlmlutils',
     packages=['sqlmlutils', 'sqlmlutils/packagemanagement'],
-    version='0.7.2',
+    version='0.7.3',
     url='https://github.com/Microsoft/sqlmlutils/Python',
     license='MIT License',
     desciption='A client side package for working with SQL Server',

Python/sqlmlutils/packagemanagement/pipdownloader.py

@@ -1,7 +1,8 @@
+import os
 import re
 import requirements
 import subprocess
-import os
+import sys
 
 from sqlmlutils import ConnectionInfo, SQLPythonExecutor
 from sqlmlutils.packagemanagement import servermethods
@@ -45,7 +46,8 @@ class PipDownloader:
         # We get the package requirements based on the print output of pip, which is stable across version 8-10.
         # TODO: get requirements in a more robust way (either through using pip internal code or rolling our own)
         download_script = os.path.join((os.path.dirname(os.path.realpath(__file__))), "download_script.py")
-        args = ["python", download_script,
+        exe_path = sys.executable if sys.executable is not None else "python"
+        args = [exe_path, download_script,
                 str(_patch_get_impl_version_info()), str(_patch_get_abbr_impl()),
                 str(_patch_get_abi_tag()), str(_patch_get_platform()),
                 ",".join(str(x) for x in commands)]