xahlee at gmail
Apr 8, 2012, 4:11 AM
Post #1 of 50
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hi guys,
sorry am feeling a bit prolifit lately.
today's show, is: 〈Fuck Python〉
http://xahlee.org/comp/fuck_python.html
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Fuck Python
By Xah Lee, 2012-04-08
fuck Python.
just fucking spend 2 hours and still going.
here's the short story.
so recently i switched to a Windows version of python. Now, Windows
version takes path using win backslash, instead of cygwin slash. This
fucking broke my find/replace scripts that takes a dir level as input.
Because i was counting slashes.
Ok no problem. My sloppiness. After all, my implementation wasn't
portable. So, let's fix it. After a while, discovered there's the
「os.sep」. Ok, replace 「"/"」 to 「os.sep」, done. Then, bang, all hell
went lose. Because, the backslash is used as escape in string, so any
regex that manipulate path got fucked majorly. So, now you need to
find a quoting mechanism. Then, fuck python doc incomprehensible
scattered comp-sci-r-us BNF shit. Then, fuck python for “os.path” and
“os” modules then string object and string functions inconsistent
ball. And FUCK Guido who wants to fuck change python for his idiotic
OOP concept of “elegance” so that some of these are deprecated.
So after several exploration of “repr()”, “format()”, “‹str›.count()”,
“os.path.normpath()”, “re.split()”, “len(re.search().group())” etc,
after a long time, let's use “re.escape()”. 2 hours has passed. Also,
discovered that “os.path.walk” is now deprecated, and one is supposed
to use the sparkling “os.walk”. In the process of refreshing my
python, the “os.path.walk” semantics is really one fucked up fuck.
Meanwhile, the “os.walk” went into incomprehensible OOP object and
iterators fuck.
now, it's close to 3 hours. This fix is supposed to be done in 10 min.
I'd have done it in elisp in just 10 minutes if not for my
waywardness.
This is Before
def process_file(dummy, current_dir, file_list):
current_dir_level = len(re.split("/", current_dir)) -
len(re.split("/", input_dir))
cur_file_level = current_dir_level+1
if min_level <= cur_file_level <= max_level:
for a_file in file_list:
if re.search(r"\.html$", a_file, re.U) and
os.path.isfile(current_dir + "/" + a_file):
replace_string_in_file(current_dir + "/" + a_file)
This is After
def process_file(dummy, current_dir, file_list):
current_dir = os.path.normpath(current_dir)
cur_dir_level = re.sub( "^" + re.escape(input_dir), "",
current_dir).count( os.sep)
cur_file_level = cur_dir_level + 1
if min_level <= cur_file_level <= max_level:
for a_file in file_list:
if re.search(r"\.html$", a_file, re.U) and
os.path.isfile(current_dir + re.escape(os.sep) + a_file):
replace_string_in_file(current_dir + os.sep + a_file)
# print "%d %s" % (cur_file_level, (current_dir + os.sep +
a_file))
Complete File
# -*- coding: utf-8 -*-
# Python
# find & replace strings in a dir
import os, sys, shutil, re
# if this this is not empty, then only these files will be processed
my_files = []
input_dir = "c:/Users/h3/web/xahlee_org/lojban/hrefgram2/"
input_dir = "/cygdrive/c/Users/h3/web/zz"
input_dir = "c:/Users/h3/web/xahlee_org/"
min_level = 2; # files and dirs inside input_dir are level 1.
max_level = 2; # inclusive
print_no_change = False
find_replace_list = [
(
u"""<iframe style="width:100%;border:none" src="http://xahlee.org/
footer.html"></iframe>""",
u"""<iframe style="width:100%;border:none" src="../footer.html"></
iframe>""",
),
]
def replace_string_in_file(file_path):
"Replaces all findStr by repStr in file file_path"
temp_fname = file_path + "~lc~"
backup_fname = file_path + "~bk~"
# print "reading:", file_path
input_file = open(file_path, "rb")
file_content = unicode(input_file.read(), "utf-8")
input_file.close()
num_replaced = 0
for a_pair in find_replace_list:
num_replaced += file_content.count(a_pair[0])
output_text = file_content.replace(a_pair[0], a_pair[1])
file_content = output_text
if num_replaced > 0:
print "◆ ", num_replaced, " ", file_path.replace("\\", "/")
shutil.copy2(file_path, backup_fname)
output_file = open(file_path, "r+b")
output_file.read() # we do this way instead of “os.rename” to
preserve file creation date
output_file.seek(0)
output_file.write(output_text.encode("utf-8"))
output_file.truncate()
output_file.close()
else:
if print_no_change == True:
print "no change:", file_path
# os.remove(file_path)
# os.rename(temp_fname, file_path)
def process_file(dummy, current_dir, file_list):
current_dir = os.path.normpath(current_dir)
cur_dir_level = re.sub( "^" + re.escape(input_dir), "",
current_dir).count( os.sep)
cur_file_level = cur_dir_level + 1
if min_level <= cur_file_level <= max_level:
for a_file in file_list:
if re.search(r"\.html$", a_file, re.U) and
os.path.isfile(current_dir + re.escape(os.sep) + a_file):
replace_string_in_file(current_dir + os.sep + a_file)
# print "%d %s" % (cur_file_level, (current_dir + os.sep +
a_file))
input_dir = os.path.normpath(input_dir)
if (len(my_files) != 0):
for my_file in my_files:
replace_string_in_file(os.path.normpath(my_file) )
else:
os.path.walk(input_dir, process_file, "dummy")
print "Done."
--
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