Formatting and minor refactoring of defau;t globals arg.

src/zc/buildout/configparser.py

@@ -111,7 +111,7 @@ option_start = re.compile(
 
 leading_blank_lines = re.compile(r"^(\s*\n)+")
 
-def parse(fp, fpname, exp_globals=None):
+def parse(fp, fpname, exp_globals=dict):
     """Parse a sectioned setup file.
 
     The sections in setup files contain a title line at the top,
@@ -176,18 +176,22 @@ def parse(fp, fpname, exp_globals=None):
                 if expression:
                     # normalize tail comments to Python style
                     tail = tail.replace(';', '#') if tail else ''
-                    # un-escape literal # and ; . Do not use a string-escape decode
+                    # un-escape literal # and ; . Do not use a
+                    # string-escape decode
                     expr = expression.replace(r'\x23','#').replace(r'x3b', ';')
                     # rebuild a valid Python expression wrapped in a list
                     expr = head + expr + tail
                     # lazily populate context only expression
                     if not context:
-                        context = exp_globals() if exp_globals else {}
+                        context = exp_globals()
                     # evaluated expression is in list: get first element
                     section_condition = eval(expr, context)[0]
-                    # finally, ignore section when an expression evaluates to false
+                    # finally, ignore section when an expression
+                    # evaluates to false
                     if not section_condition:
-                        logger.debug('Ignoring section %(sectname)r with [expression]: %(expression)r' % locals())
+                        logger.debug(
+                            'Ignoring section %(sectname)r with [expression]:'
+                            ' %(expression)r' % locals())
                         continue
 
                 if sectname in sections: