Fix for error with no key provided, closes #3

Author: MainHanzo

csv_diff/__init__.py

@@ -20,7 +20,9 @@ def load_csv(fp, key=None, dialect=None):
     if key:
         keyfn = lambda r: r[key]
     else:
-        keyfn = lambda r: hashlib.sha1(json.dumps(r, sort_keys=True).encode("utf8"))
+        keyfn = lambda r: hashlib.sha1(
+            json.dumps(r, sort_keys=True).encode("utf8")
+        ).hexdigest()
     return {keyfn(r): r for r in rows}
 
 

tests/test_csv_diff.py

@@ -43,6 +43,14 @@
 3,Bailee,1,100
 4,Bob,7,422"""
 
+NINE = """id,name,age
+1,Cleo,5
+2,Pancakes,4"""
+
+TEN = """id,name,age
+1,Cleo,5
+2,Pancakes,3"""
+
 
 def test_row_changed():
     diff = compare(

tests/test_human_text.py

@@ -1,5 +1,5 @@
 from csv_diff import load_csv, compare, human_text
-from .test_csv_diff import ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT
+from .test_csv_diff import ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN
 from textwrap import dedent
 import io
 
@@ -198,3 +198,27 @@ def test_columns_and_rows_changed():
         ).strip()
         == human_text(diff, "id")
     )
+
+
+def test_no_key():
+    diff = compare(load_csv(io.StringIO(NINE)), load_csv(io.StringIO(TEN)))
+    assert (
+        dedent(
+            """
+        1 row added, 1 row removed
+
+        1 row added
+
+          id: 2
+          name: Pancakes
+          age: 3
+
+        1 row removed
+
+          id: 2
+          name: Pancakes
+          age: 4
+        """
+        ).strip()
+        == human_text(diff)
+    )