Hello, I am trying to open a file in read mode using Python.

Question

The error I am receiving suggest I am using the wrong filename or read mode. When I type the file path into my computer, it works. I tried to assign the input filename to a variable and then opening the variable in read mode. I also tried typing in the full path and opening the path in read mode. Both gave me an error. Error for opening variable:IOError: [Errno 2] No such file or directory: 'full_original'. Error for opening full path, [Errno 22] invalid mode ('r') or filename

 

 

Current code  attempting to open and read original file:

 

import os
def main():
    "houses main structure of program "
def information(filenames):
    "houses all neseccary files "
workingDirec = raw_input("What is the working directory?")
original_file = raw_input("The input filename is?")
chi_square = raw_input("The name of the chi-squared stats table file is?")
out_file = raw_input ("What is the output filename?")

 

def calculateZscore():
    "Z score calc"
full_original = os.path.join(workingDirec,original_file)
print full_original


f = open ('C:\Users\tpmorris\ProgramingAndScripting\Lab 2 Data\Lab 2 Data\NCSIDS_ObsExp.txt','r')
print f

Answer 1

Notes:

1. Make sure to replace placeholders like workingDir, original_file, etc., with actual values or variables containing user input.
2. Double-check the paths to ensure they are correct and accessible from your Python script.
3. Adjust the file reading (f.read()) to perform the necessary operations on your file data.

This structure should help you debug and resolve the issues you were encountering with opening and reading files in your Python program. Adjustments to fit specific needs and error handling can be made based on further details about your requirements.

Answer 2

If You still have any difficulties with it may be you have a problem with encoding so I suggest to :

with open(file_path, 'r+ [or other mode]',encoding='utf-8-sig') as f:

Answer 3

There's a quick fix, which works across all operating systems: python 3's Pathlib module!

A quick context-specific example:

from pathlib import Path

#Hard code, or take from input() function:

directory = '\Users\tpmorris\ProgramingAndScripting\Lab 2 Data\Lab 2 Data\'

#Parse and overwrite:

directory = Path(directory)

file_path = directory / "your_filename"

with open(file_path, 'r+ [or other mode]') as f:

#do stuff with file

Full read about Pathlib here:

https://medium.com/@ageitgey/python-3-quick-tip-the-easy-way-to-deal-with-file-paths-on-windows-mac-and-linux-11a072b58d5f

Answer 4

Just try changing the back slashes to forward slashes.

You may also want to switch to a relative path instead of a full path. Let say your program lives in "ProgrammingAndScripting", you should only need 'Lab 2 Data/Lab Data/NCSIDS_ObsExp.txt'.

The forward slashes are just like the way you would break up a path for your web browser.

Using the relative path eliminates the drive letter, making your program more compatible with other platforms.