Observations

observations.py

# 1) 2 blank spaces between a function definition and end. i.e.
import foo


def diinosaur():
    pass


def something_else():
    pass


# 2) Ah!  Global variables!  If it's going to be reused, maybe a class is better and file_dir can be set in the constructor.  i.e.

class AllStandardsCss(object):

    def __init__(self, file_dir):
        self.file_dir = file_dir

    def do_something(self):
        print "Look I'm using the file_dir var: %s" % (self.file_dir, )

file_dir = '/path/to/something'
all_standards = AllStandardsCss(file_dir)
all_standards.do_something()

# 3) open returns an iterator, so no need to read all the lines into memory

for line in open(file_dir, 'r'):
    print line

# 4) There are builtin functions for copying, moving, removing files.
import os
import shutil

# http://docs.python.org/library/os.html#os.remove
os.remove('path/to/file')
# http://docs.python.org/library/shutil.html#shutil.copy
shutil.copy(src, destination)

# 5) get_all_elements().  I think the easiest way to define these is 
#    a dictionary of lists like so:
elements = {
    'border-radius': ['-moz-border-radius', '-webkit-border-radius'],
    'border-top-right-radius': ['-moz--top-right-radius', '-webkit-top-right-radius']
}

for rule in elements:
    print "The rule is %s" % (rule, )
    print "The following need to be added:"
    for new_rule in elements[rule]:
        print new_rule