Add EXPORT_JSON and EXPORT_CSV blocks

blocks/DATA/EXPORT/EXPORT_CSV/EXPORT_CSV.py

@@ -0,0 +1,51 @@
+import pandas as pd
+import os
+from flojoy import (
+    DataFrame,
+    OrderedPair,
+    OrderedTriple,
+    flojoy,
+    DataContainer,
+    Directory,
+)
+from typing import Optional
+
+
+@flojoy
+def EXPORT_CSV(
+    dc: OrderedPair | OrderedTriple | DataFrame,
+    dir: Directory,
+    filename: str = "exported.csv",
+) -> Optional[DataContainer]:
+    """Export a DataContainer into CSV format.
+
+    Parameters
+    ----------
+    dc : OrderedPair|OrderedTriple|DataFrame
+        The DataContainer to export.
+    dir : Directory
+        The directory to export to.
+    filename : str
+        The name of the file to output.
+
+    Returns
+    -------
+    None
+    """
+
+    if dir is None:
+        raise ValueError("Please select a directory to export the data to")
+
+    match dc:
+        case OrderedPair() | OrderedTriple():
+            df = pd.DataFrame(dc)
+            df = df.drop(columns=["type", "extra"])
+        case DataFrame():
+            df = dc.m
+        case _:
+            raise ValueError(
+                f"Invalid DataContainer type: {dc.type} cannot be exported as CSV."
+            )
+
+    df.to_csv(os.path.join(dir.unwrap(), filename), index=False)
+    return None