old_contents: import os
  import platform
  import sys
  
  if __name__ == "__main__":
          
      for gcc_version in ["4.6", "4.8", "4.9", "5.2"]:
          image_name = "lasote/conangcc%s" % gcc_version.replace(".", "")
          os.system("sudo docker pull %s" % image_name)
          curdir = os.path.abspath(os.path.curdir)
          command = 'sudo docker run --rm  -v %s:/home/conan/project -v '\
                    '~/.conan/data:/home/conan/.conan/data -it %s /bin/sh -c '\
                    '"cd project && python build.py"' % (curdir, image_name)
          os.system(command)
  
new_contents: import os
  import platform
  import sys
  
  if __name__ == "__main__":
          
      for gcc_version in ["4.6", "4.8", "4.9", "5.2"]:
          image_name = "lasote/conangcc%s" % gcc_version.replace(".", "")
          os.system("sudo docker pull %s" % image_name)
          curdir = os.path.abspath(os.path.curdir)
          command = 'sudo docker run --rm  -v %s:/home/conan/project -v '\
                    '~/.conan/data:/home/conan/.conan/data -it %s /bin/sh -c '\
                    '"cd project && sudo pip install conan==0.0.1rc1 && python build.py"' % (curdir, image_name)
          os.system(command)
  
subject: Build with dev version