API: leading whitespaces have been removed for to_string(index=False), #11833

Author: Vutsuak16

doc/source/whatsnew/v0.18.0.txt

@@ -161,6 +161,8 @@ 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`)
+
 Backwards incompatible API changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

pandas/core/format.py

@@ -245,7 +245,8 @@ 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 +578,8 @@ 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

@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# -*- coding: utf-8 -*-
 from __future__ import print_function
 from distutils.version import LooseVersion
 import re
@@ -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)
 
@@ -3106,13 +3106,13 @@ def test_to_string_float_na_spacing(self):
         self.assertEqual(result, expected)
 
     def test_to_string_without_index(self):
-        #GH 11729 Test index=False option
-        s= Series([1, 2, 3, 4])
+        # 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):