Add CHMI fetcher, fixes #47 (#55)

Author: kratzert

examples/test_czech_fetcher.py

@@ -0,0 +1,49 @@
+import logging
+
+import matplotlib.pyplot as plt
+
+from rivretrieve import CzechFetcher, constants
+
+logging.basicConfig(level=logging.INFO)
+
+gauge_ids = [
+    "0-203-1-016000",  # Example gauge_id from issue #47
+]
+variable = constants.DISCHARGE_DAILY_MEAN
+start_date = "2020-01-01"
+end_date = "2020-01-31"
+
+plt.figure(figsize=(12, 6))
+
+fetcher = CzechFetcher()
+for gauge_id in gauge_ids:
+    print(f"Fetching {variable} for {gauge_id} from {start_date} to {end_date}...")
+    data = fetcher.get_data(gauge_id=gauge_id, variable=variable, start_date=start_date, end_date=end_date)
+    if not data.empty:
+        print(f"Data for {gauge_id}:")
+        print(data.head())
+        print(f"Time series from {data.index.min()} to {data.index.max()}")
+        plt.plot(
+            data.index,
+            data[variable],
+            label=gauge_id,
+            marker=".",
+            linestyle="-",
+        )
+    else:
+        print(f"No data found for {gauge_id}")
+
+if "data" in locals() and not data.empty:
+    plt.xlabel(constants.TIME_INDEX)
+    plt.ylabel(f"{variable} (m3/s)")
+    plt.title(f"Czech River Discharge ({gauge_ids[0]} - {start_date} to {end_date})")
+    plt.legend()
+    plt.grid(True)
+    plt.tight_layout()
+    plot_path = "czech_discharge_plot.png"
+    plt.savefig(plot_path)
+    print(f"Plot saved to {plot_path}")
+else:
+    print("No data to plot.")
+
+print("Test finished.")

rivretrieve/__init__.py

@@ -5,6 +5,7 @@
 from .brazil import BrazilFetcher
 from .canada import CanadaFetcher
 from .chile import ChileFetcher
+from .czech import CzechFetcher
 from .france import FranceFetcher
 from .japan import JapanFetcher
 from .poland import PolandFetcher