issue-11833 solved , docs updated as well

modifies test_format

squashed

Author: Vutsuak16

doc/source/whatsnew/v0.18.0.txt

@@ -161,6 +161,26 @@ In addition, ``.round()`` will be available thru the ``.dt`` accessor of ``Serie
 
 .. _whatsnew_0180.api_breaking:
 
+- the leading whitespaces have been removed from the output of  ``to_string(index=False)``  method (:issue:'11833')
+
+Previous Behaviour for the DataFrame Objects
+
+.. code-block:: python
+
+   In [3]: df = pd.DataFrame({'a':range(5),'b':range(5)})
+   In [3]: df.to_string(index=False)
+   Out [4]: u' a  b\n 0  0\n 1  1\n 2  2\n 3  3\n 4  4'
+
+
+New Behaviour for the DataFrame Objects
+
+.. ipython:: python
+
+   df=pd.DataFrame({'a':range(5),'b':range(5)})
+   df.to_string(index=False)
+
+Similar behaviour applies for the Series objects as well.
+
 Backwards incompatible API changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

pandas/core/format.py

@@ -245,7 +245,7 @@ def to_string(self):
         if self.index:
             result = self.adj.adjoin(3, *[fmt_index[1:], fmt_values])
         else:
-            result = self.adj.adjoin(3, fmt_values)
+            result = self.adj.adjoin(3, fmt_values).replace('\n ','\n').strip()
 
         if self.header and have_header:
             result = fmt_index[0] + '\n' + result
@@ -577,7 +577,8 @@ def to_string(self):
                 self._chk_truncate()
                 strcols = self._to_str_columns()
                 text = self.adj.adjoin(1, *strcols)
-
+        if not self.index:
+            text=text.replace('\n ','\n').strip()
         self.buf.writelines(text)
 
         if self.should_show_dimensions:

pandas/tests/test_format.py

@@ -1725,7 +1725,7 @@ def test_to_string_no_index(self):
                         'y': [4, 5, 6]})
 
         df_s = df.to_string(index=False)
-        expected = " x  y\n 1  4\n 2  5\n 3  6"
+        expected = "x  y\n1  4\n2  5\n3  6"
 
         self.assertEqual(df_s, expected)
 
@@ -3109,10 +3109,10 @@ def test_to_string_without_index(self):
         #GH 11729 Test index=False option
         s= Series([1, 2, 3, 4])
         result = s.to_string(index=False)
-        expected = (u(' 1\n') +
-                    ' 2\n' +
-                    ' 3\n' +
-                    ' 4')
+        expected = (u('1\n') +
+                    '2\n' +
+                    '3\n' +
+                    '4')
         self.assertEqual(result, expected)
 
     def test_unicode_name_in_footer(self):