read all .jack files in python

[dmoeller]

I tried looking online but I don't understand how to load all .jack files from a directory. I want to do something like:

for ('*.jack') in (path):
    jackFile = open('.jack', r)

Please help me understand how to do this. Thank you

[cadet1620]

Here's a quick example of reading a directory and filtering for file extension.

[D:/TECS/projects/09/Square]
% cat d:/tmp/test.py

import os
dir_name = '.'      # ( should use argument from command line)
for file_name in os.listdir(dir_name):
    if file_name[-5:] == '.jack':
        out_name = file_name[:-5] + '.vm'
        print(file_name, '->', out_name)

[D:/TECS/projects/09/Square]
% d:/tmp/test.py
Main.jack -> Main.vm
Square.jack -> Square.vm
SquareGame.jack -> SquareGame.vm
[D:/TECS/projects/09/Square]
% ls
Main.jack  OS\         Square.hack  Square.lst  SquareGame.jack
Main.vm    Square.asm  Square.jack  Square.vm   SquareGame.vm
[D:/TECS/projects/09/Square]
%

(For code that is intended to be cross-platform portable you should use the os.path functions that know about OS specific file naming conventions.)

--Mark

[dmoeller]

OK i programmed that. when i try to open(filename, 'rU') and filename in this case would be "Main.jack" i get

File "JackTokenizer.py", line 6, in <module> class JackTokenizer:
File "JackTokenizer.py", line 19, in JackTokenizer jackFile = open(file, 'rU') filenotfounderror: [Errno 2] no such file or directory: "Main.jack"

but it is there. I can see it. it is in the nand2tetris folder under projects\10\arraytest

[cadet1620]

My guess is that the "current working directory" is wrong. Try adding
    print(os.getcwd())
to see where it is.

How are you running your Python program?

--Mark

[dmoeller]

i use the command prompt and move to the directory of my JackTokenizer.py. Then i use the command python JackTokenizer.py and it interprets my code from there

[dmoeller]

so i added the print os.getcwd and it prints the directory 1 folder out of where i am aiming. meaning:

C:\users\schuylab\desktop\nand2tetris\projects\10\ArrayTest is where I am trying to navigate to
C:\users\schuylab\desktop\nand2tetris\projects\10               is what prints

[cadet1620]

You need to pass the directory name into listdir, as in
    dir_name = 'ArrayTest'
    os.listdir(dir_name)

My example was listing files in the current directory (the "." in dir_name='.')

--Mark

[dmoeller]

this is what I have

        print ('please enter a file or directory path.')
        path = input()
        for file in os.listdir(path):
                if file[-5:]=='.jack':
                        print(os.getcwd())

I thouth input() was a cmd command

so in my case path = C:\users\.....\10\ArrayTest
but only C:\...\10 prints