Python: [Errno 2] No such file or directory
Question: I want to open and read all csv file in a specific folder. I'm on OS X El
Capitan version 10.11.6, and I'm using Python 2.7.10. I have the following
function in phyton file:

    
    
    def open_csv_files(dir):
    for root,dirs,files in os.walk(dir):
        for file in files:
            if file.endswith(".csv"):
                f= open(file)
                print "FILE OPEN, AND DO SOMETHING... "
                f.close
    return
    

I call `open_csv_file(./dati/esempi)`

This procedure return

    
    
    IOError: [Errno 2] No such file or directory: 'sensorfile_1.csv'
    

I try to call the procedure with absolute path
`/Users/Claudia/Desktop/Thesis/dati/esempi/` but I have the same error.

Moreover I define another procedure that print all filename in folder, this
procedure print correctly all filenames in folder.

Thanks for the help.


Answer: You need to build absolute path to file based on values of `root` (base dir)
and file name.

    
    
    import os
    
    
    def open_csv_files(directory):
        for root, dirs, files in os.walk(directory):
            for file_name in files:
                if file_name.endswith(".csv"):
                    full_file_path = os.path.join(root, file_name)
                    with open(full_file_path) as fh:
                        print "Do something with", full_file_path
    

