old_contents: from string import Template
  
  import os
  
  from configuration_py.parsers.base_parser import BaseConfigParser
  
  
  class ConfigStringTemplateProcessor(BaseConfigParser):
      extensions = 'tmpl', 'strtmpl'
  
      def parse(self, file_content, context={}):
          context.update(os.environ)
          try:
              return Template(file_content).substitute(context)
          except KeyError, e:
              raise EnvironmentError(
                  'Config try to use {e} variable which does not exists. Pass variable to load context '
                  'or set it to the environment.'.format(e=e))
  
new_contents: from string import Template
  
  import os
  
  from configuration_py.parsers.base_parser import BaseConfigParser
  
  
  class ConfigStringTemplateProcessor(BaseConfigParser):
      extensions = 'tmpl', 'strtmpl'
  
      def parse(self, file_content, context={}):
          context.update(os.environ)
          try:
              return Template(file_content).substitute(context)
          except KeyError, exc:
              raise EnvironmentError(
                  'Config try to use {exc} variable which does not exists. Pass variable to load context '
                  'or set it to the environment.'.format(exc=exc))
  
subject: Fix variable name