remove references to python 3.7 support

README.md

@@ -257,7 +257,7 @@ conda install -c conda-forge netCDF4
 * Clone GitHub repository (`git clone https://github.com/Unidata/netcdf4-python.git`)
 
 * Make sure [numpy](http://www.numpy.org/) and [Cython](http://cython.org/) are
-  installed and you have [Python](https://www.python.org) 3.7 or newer.
+  installed and you have [Python](https://www.python.org) 3.8 or newer.
 
 * Make sure [HDF5](http://www.h5py.org/) and netcdf-4 are installed, 
   and the `nc-config` utility is in your Unix PATH.

pyproject.toml

@@ -12,7 +12,7 @@ description = "Provides an object-oriented python interface to the netCDF versio
 authors = [
   {name = "Jeff Whitaker", email = "jeffrey.s.whitaker@noaa.gov"},
 ]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 keywords = [
     "numpy", "netcdf", "data", "science", "network", "oceanography",
     "meteorology", "climate",
@@ -21,7 +21,6 @@ license = {text = "MIT"}
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",

src/netCDF4/_netCDF4.pyx

@@ -32,7 +32,7 @@ types) are not supported.
 
  - Clone the
    [github repository](http://github.com/Unidata/netcdf4-python).
- - Make sure the dependencies are satisfied (Python 3.7 or later,
+ - Make sure the dependencies are satisfied (Python 3.8 or later,
    [numpy](http://numpy.scipy.org),
    [Cython](http://cython.org),
    [cftime](https://github.com/Unidata/cftime),