BUG: Fix justification for DataFrame.to_string(index=False)

Author: buggi22

pandas/formats/format.py

@@ -605,7 +605,9 @@ def to_string(self):
                 strcols = self._to_str_columns()
                 text = self.adj.adjoin(1, *strcols)
         if not self.index:
-            text = text.replace('\n ', '\n').strip()
+            # Remove a single space from the beginning of each line
+            # and remove any trailing spaces
+            text = text.replace('\n ', '\n')[1:].rstrip()
         self.buf.writelines(text)
 
         if self.should_show_dimensions:

pandas/tests/formats/test_format.py

@@ -1974,11 +1974,28 @@ def test_to_string_no_header(self):
         self.assertEqual(df_s, expected)
 
     def test_to_string_no_index(self):
-        df = DataFrame({'x': [1, 2, 3], 'y': [4, 5, 6]})
+        df = DataFrame({'aaaaa': [100, 200, 300], 'bbbbb': [400, 500, 600]})
+        df_s = df.to_string(index=False)
+        expected = "aaaaa  bbbbb\n" \
+                   "  100    400\n" \
+                   "  200    500\n" \
+                   "  300    600"
+        self.assertEqual(df_s, expected)
 
+        df = DataFrame({'aaa': [100, 200, 300], 'bbb': [400, 500, 600]})
         df_s = df.to_string(index=False)
-        expected = "x  y\n1  4\n2  5\n3  6"
+        expected = "aaa  bbb\n" \
+                   "100  400\n" \
+                   "200  500\n" \
+                   "300  600"
+        self.assertEqual(df_s, expected)
 
+        df = DataFrame({'a': [100, 200, 300], 'b': [400, 500, 600]})
+        df_s = df.to_string(index=False)
+        expected = "  a    b\n" \
+                   "100  400\n" \
+                   "200  500\n" \
+                   "300  600"
         self.assertEqual(df_s, expected)
 
     def test_to_string_line_width_no_index(self):