add: installation, simple tools for conversion and check

.gitignore

+*.DS*
+.vscode
+.idea
+.ipynb_checkpoints
+*/.ipynb_checkpoints
+*/*/.ipynb_checkpoints
+.vscode
+*.log
+.idea*
+conda_env/
+**/*.sw[pco]
+**/*.*.sw[pco]
+**/.ipynb_checkpoints*
+**/*.py[co]
+**/*~
+**/._README.md
+**/*egg*

Makefile

+# makefile used for testing
+#
+#
+ENV_NAME=era5-tables
+.PHONY: all conda install test
+
+all: install test
+
+conda:
+	conda create -n $(ENV_NAME) python=3.11
+
+install: conda
+	@# python3 -m pip install -e .[dev]
+	conda run -n $(ENV_NAME) python -m pip install -e .[dev]
+
+check:
+	conda activate $(ENV_NAME); cfchecks $(file)
+
+clean:
+	conda remove -n $(ENV_NAME) --all -y
+
+lint:
+	mypy --install-types --non-interactive
+	black --check -t py311 -l 79 src
+	flake8 src/rechunk_data --count --max-complexity=15 --max-line-length=88 --statistics --doctests
\ No newline at end of file

setup.py

+from setuptools import setup, find_packages
+
+setup(
+    name='era5-tables',
+    version='0.1',
+    packages=find_packages(where='src'),
+    package_dir={'': 'src'},
+    install_requires=[
+        'pandas>=2.0.0',
+        'openpyxl>=3.1.0',
+        'cfchecker>=4.1.0',
+        'netCDF4>=1.6.0',
+        'numpy>=1.20.0'
+    ],
+    extras_require={
+        'dev': [
+            'pytest',
+            'mypy',
+            'black',
+            'flake8',
+            'ipython'
+        ]
+    },
+    python_requires='>=3.9',
+)

src/converter.py

+import pandas as pd
+import json
+import csv
+from pathlib import Path
+
+def excel_to_csv(excel_path, csv_path, sheet_name=0, field_separator="|"):
+    df = pd.read_excel(excel_path, sheet_name=sheet_name)
+    df.to_csv(csv_path, sep=field_separator, index=False)
+    return csv_path
+
+def csv_to_json(csv_path, json_path):
+    with open(csv_path, encoding='utf-8') as csvf:
+        csv_reader = csv.DictReader(csvf)
+        data = [row for row in csv_reader]
+
+    with open(json_path, 'w', encoding='utf-8') as jsonf:
+        json.dump(data, jsonf, indent=2)
+    
+    return json_path

src/validator.py

+import subprocess
+import sys
+
+def cf_check(nc_file):
+    try:
+        result = subprocess.run(['cfchecks', nc_file], capture_output=True, text=True, check=True)
+        print(result.stdout)
+    except subprocess.CalledProcessError as e:
+        print("CF checker error:", e.stderr, file=sys.stderr)
+        sys.exit(1)