Is it possible to update a CSS file from Python

[Pedroski55]

css is just a text file!

Assuming: $customer_color_1: #cb2324; only appears 1 time, very easy.
Leave out the $, I think that will complicate matters! I think it is a reserved symbol.

myfile = '/path/to/mycss_files/my_css_file.css')
with open('path2mycssfile') as mycss:
    mystring = mycss.read()

newstring = mystring.replace('customer_color_1: #cb2324', 'customer_color_1: #005f9f')

with open('path2mycssfile', 'w') as mycss:
    mycss.write(newstring)

Otherwise, if you know the line number, also very easy.

linenr = 1
with open('path2mycssfile') as mycss:
    mylist = mycss.readlines()

# list numbering starts at 0
# line 1 is mylist[0]
my_line = linenr - 1 
the_line = mylist[my_line]
the_new_line = the_line.replace('customer_color_1: #cb2324', 'customer_color_1: #005f9f')
mylist[my_line] = the_new_line
mystring = ''.join(mylist)
with open('path2mycssfile', 'w') as mycss:
    mycss.write(mystring)

If the text you want to replace is present on more than 1 line, find all the lines with that text, then display them with line number, choose the line you want and replace.