Region: Ioerror: [Errno 22] Invalid Mode ('W') or Filename

Region: IOError: [Errno 22] invalid mode ('w') or filename

Use forward slashes:

'path/regionlog.txt'

Or raw strings:

r'path\regionlog.txt'

Or at least escape your backslashes:

'path\\regionlog.txt'

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\r is a carriage return.

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Another option: use os.path.join and you won't have to worry about slashes at all:

output = os.path.abspath(os.path.join('path', 'regionlog.txt'))

IOError: [Errno 22] invalid mode ('w') or filename

You cannot have slashes (/) and colons (:, but allowed in Unix) in your file name, but they are exactly what strftime generates in its output.

Python tries to help you, it says:

No such file or directory: 'Bursarcodes_01/09/15_19:59:24.txt'

Replace time.strftime("%x") with this:

time.strftime("%x").replace('/', '.')

...and time.strftime("%X") with this:

time.strftime("%X").replace(':', '_')

IOError: [Errno 22] invalid mode ('r') or filename

You have an invisible character in your code. Use a hex editor or hex dumper to see it:

$ echo 'open("C:\\' | hd
00000000  6f 70 65 6e 28 22 e2 80  aa 43 3a 5c 5c 0a        |open("...C:\\.|

The character in question is U+202a, the left-to-right embedding character, encoded as UTF-8 as e2 80 aa.

Remove the character from your source code by deleting ("C: and retyping it.

IOError: [Errno 22] invalid mode ('wb') or filename:

You cannot use : in Windows filenames, see Naming Files, Paths, and Namespaces ; it is one of the reserved characters:

• The following reserved characters:

  • < (less than)
  • > (greater than)
  • : (colon)
  • " (double quote)
  • / (forward slash)
  • \ (backslash)
  • | (vertical bar or pipe)
  • ? (question mark)
  • * (asterisk)

Use a different character not on the reserved character list.

IOError: [Errno 22] invalid mode ('r') or filename: 'c:\\Python27\test.txt'

\t is a tab character. Use a raw string instead:

test_file=open(r'c:\Python27\test.txt','r')

or double the slashes:

test_file=open('c:\\Python27\\test.txt','r')

or use forward slashes instead:

test_file=open('c:/Python27/test.txt','r')

IOError: [Errno 22] invalid mode ('rb') or filename: '\x89PNG\n'

The retrun value of askopenfilename is a string. As you were traversing over a string (Probabily a path like C:\Somepath\someimage.png) you got the following error.

Errno2: No such file or directory: u'C'

You need to use the askopenfilenames module to get multiple files.

image_formats = [('PNG','*.png')]
file_path_list = askopenfilenames(filetypes=image_formats, initialdir='/', title='Please select a picture to analyze')
for file_path in file_path_list:
    file_path = os.path.normpath(file_path)  # To normalize path 
    image = data.imread(file_path) 
    image2 = data.imread(file_path) 

Use for file_path in file_path_list.split() for python<2.7.7, as the return value was a string instead of tuple.

https://docs.python.org/2/library/os.path.html#os.path.normpath

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Orignal Question

Op had pasted code with askopenfile instead of askopenfilename

tkFileDialog.askopenfile returns selected file opened in r mode if mode is not specified.

def askopenfile(mode = "r", **options):
    "Ask for a filename to open, and returned the opened file"

    filename = Open(**options).show()
    if filename:
        return open(filename, mode)
    return None

While the input to imread is image file path.
You need to use askopenfilenames which returns selected files path.

Scrapy IOError: [Errno 22] invalid mode ('wb') or filename

You failed to replace the special chars. Try this:

filename = os.path.join(directory,experience['Title'][0]+'.txt')
filename = filename.replace('\\' , "").replace('?' , "")

UPDATE

You just want to specify a legal file name. So I come up with an idea like this.

directory = os.path.join('Erowid/archive/',experience['Substance'][0].strip().lower())
filename = experience['Substance']+experience['Title'][0]+'.txt'
filename = "".join([i for i in filename if i in string.ascii_letters]) 
#only use ascii letters as file name 
filename = os.path.join(directory, filename)

string.ascii_letters

The concatenation of the ascii_lowercase and ascii_uppercase constants described below. This value is not locale-dependent.

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