add script to read in depreciation data

data/pull_depreciation.py

@@ -0,0 +1,52 @@
+"""
+This model has functions to read in depreciation data
+"""
+
+# imports
+import numpy as np
+import pandas as pd
+from data_paths import get_paths
+
+globals().update(get_paths())
+
+
+def get_depr():
+    """
+    Reads in the list of assets and their economic depreciation values
+    from BEA data and the tax depriation system for each asset type from
+    the IRS
+
+    Args:
+        None
+
+    Returns:
+        econ_deprec_rates (DataFrame): economic depreciation rates for
+                           all asset types
+
+    """
+    econ_deprec_rates = pd.read_csv(_ECON_DEPR_IN_PATH)
+    econ_deprec_rates = econ_deprec_rates.fillna(0)
+    econ_deprec_rates.rename(
+        columns={
+            "Code": "bea_asset_code",
+            "Economic Depreciation Rate": "delta",
+        },
+        inplace=True,
+    )
+    econ_deprec_rates["Asset"] = econ_deprec_rates["Asset"].str.strip()
+    econ_deprec_rates["bea_asset_code"] = econ_deprec_rates[
+        "bea_asset_code"
+    ].str.strip()
+
+    tax_deprec = pd.read_csv(_TAX_DEPR)
+    tax_deprec["Asset Type"] = tax_deprec["Asset Type"].str.strip()
+
+    deprec_rates = tax_deprec.merge(
+        econ_deprec_rates,
+        how="left",
+        left_on=["Asset Type"],
+        right_on=["Asset"],
+        copy=True,
+    )
+
+    return deprec_rates