BUG: handle zero-padding differently per comment in#578

Author: wesm

pandas/core/common.py

@@ -360,7 +360,7 @@ def _try_sort(iterable):
     except Exception:
         return listed
 
-def set_printoptions(precision=None, column_space=None, max_rows=None, 
+def set_printoptions(precision=None, column_space=None, max_rows=None,
                      max_columns=None):
     """
     Alter default behavior of DataFrame.toString
@@ -523,7 +523,10 @@ def _just_help(x):
         # if we pass col_width, pad-zero the floats so all are same in column
         if col_width is not None and formatted != ' 0':
             padzeros = col_width - len(formatted)
-            if padzeros > 0:
+            if padzeros > 0 and 'e' in formatted:
+                num, exp = formatted.split('e')
+                formatted = "%s%se%s" % (num, ('0' * padzeros), exp)
+            elif padzeros > 0:
                 formatted = formatted + ('0' * padzeros)
 
         return _just_help(formatted)

pandas/core/format.py

@@ -203,9 +203,9 @@ def _myformat(col):
             if issubclass(col.dtype.type, np.floating):
                 col_width = max(map(len, map(formatter, col)))
                 formatter = lambda v: _format(v, space=col_space,
-                                            na_rep=self.na_rep,
-                                            float_format=self.float_format,
-                                            col_width=col_width)
+                                              na_rep=self.na_rep,
+                                              float_format=self.float_format,
+                                              col_width=col_width)
             return formatter
 
         formatters = {} if self.formatters is None else self.formatters