I have a ~600MB Roblox type .mesh file, which reads like a text file in any text editor. I have the following code below:
mesh = open("file.mesh", "r").read()
mesh = mesh.replace("[", "{").replace("]", "}").replace("}{", "},{")
mesh = "{"+mesh+"}"
f = open("p2t.txt", "w")
f.write(mesh)
It returns:
Traceback (most recent call last):
File "C:\TheDirectoryToMyFile\p2t2.py", line 2, in <module>
mesh = mesh.replace("[", "{").replace("]", "}").replace("}{", "},{")
MemoryError
Here is a sample of my file:
[-0.00599, 0.001466, 0.006][0.16903, 0.84515, 0.50709][0.00000, 0.00000, 0][-0.00598, 0.001472, 0.00599][0.09943, 0.79220, 0.60211][0.00000, 0.00000, 0]
What can I do?
Edit:
I'm not sure what the head, follow, and tail commands are in that other thread that marked this as a duplicate. I tried to use it, but couldn't get it to work. The file is also one giant line, it isn't split into lines.
Best How To :
You need to read one bite per iteration, analyze it and then write to another file or to sys.stdout. Try this code:
mesh = open("file.mesh", "r")
mesh_out = open("file-1.mesh", "w")
c = mesh.read(1)
if c:
mesh_out.write("{")
else:
exit(0)
while True:
c = mesh.read(1)
if c == "":
break
if c == "[":
mesh_out.write(",{")
elif c == "]":
mesh_out.write("}")
else:
mesh_out.write©
UPD:
It works really slow (thanks to jamylak). So I've changed it:
import sys
import re
def process_char(c, stream, is_first=False):
if c == '':
return False
if c == '[':
stream.write('{' if is_first else ',{')
return True
if c == ']':
stream.write('}')
return True
def process_file(fname):
with open(fname, "r") as mesh:
c = mesh.read(1)
if c == '':
return
sys.stdout.write('{')
while True:
c = mesh.read(8192)
if c == '':
return
c = re.sub(r'\[', ',{', c)
c = re.sub(r'\]', '}', c)
sys.stdout.write(c)
if __name__ == '__main__':
process_file(sys.argv[1])
So now it's working ~15 sec on 1.4G file. To run it:
$ python mesh.py file.mesh > file-1.mesh
