Making the name of shape node to be the same as the parent

Question

How can I make the name of the shape node to have similar name as its parent node? (Assuming there is only 1 shape node per geometry/object)

For eg. parent_geo is called test_geo1, however its shape node is testing_geo2Shape instead of test_geo1Shape

I tried doing the following:

all = cmds.ls(sl=True, dag=True, shapes=True)
for shape in all:
    prt = cmds.listRelatives(shape, parent=True)
    for i in prt:
        child = cmds.listRelatives(i, c = True)
        for c in child:
            cmds.rename(c, str(prt) + "Shape")

and I get some funky names such as u_test_geo1__Shape etc

Answer 1

all = cmds.ls(sl=True, dag=True, shapes=True)
for shape in all:
    ''' 
       shape contain the dag path
       exm.:
       grp_a
           grp_aShape
           grp_b
               grp_bShape
       print cmds.ls('grp_a', dag=1, shapes=1)
       >>('grp_a|grp_aShape', 'grp_b|grp_bShape')
       now rename the object, we have already the dag path so 
       the input of the rename command is unique, you can also split the dag 
       path by '|'[0] as parent
    '''
    cmds.rename(shape, "{0}Shape".format(cmds.listRelatives(shape, parent=True)[0]))

tested hierarchy was like:

grp_a
     shape grp_a
     grp_b
          same name like shape grp_c
grp_c
     shape grp_c
     grp_d
          same name like shape grp_c
grp_e
     same name like shape grp_c

select only the top grp