Python file write operations.

Program in Python to open and write file

This program writes to the file specified with-in the python code

import sys

import os

import string

def write_file(file):

file_to_write = open('test_write.txt', 'w')

file_to_write.write('Text to write')

file_to_write.close()

file = write_file(open('test_write.txt', 'w'))

 

Now lets make the file writes to be more interesting

 

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Interview Questions.

Specify files to be written from the command line.

Python code to write into files which are specified from the command line

#!/usr/bin/python

import sys

import os

import string

def write_file(file):

     file_to_write = file

     file_to_write.write('Text to write')

     file_to_write.close()

     return

if len(sys.argv) == 1:

    write_file(sys.stdin)

else:

    write_file(open(sys.argv[1], 'w'))

Python File writes using classes & global variables

We can further modify the Python file writes by using Classes and global variables in python

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We can further modify the Python file writes by using Classes and global variables in python.

~\Documents\fullchip\python\mysite\webpages\templates\webpages\test.py.html 
import sys

import os

import string

class writefile:

    def write_file(self, file):

         self.file_to_write = file

         self.file_to_write.write('Text to write')

         self.file_to_write.close()

         return

if len(sys.argv) == 1:

    r1 = writefile()

    r1.write_file(sys.stdin)

else:

    r1 = writefile()

    r1.write_file(open(sys.argv[1], 'w'))

Following list of programs are discussed in this sec:

¶ File Operations: 

  1. Open and read file from within the python program as a single string. Command line arguments lists as string with ‘sys.argv’.
  2. Use of  glob module in Python code . Read file using classes, global variables and functions. Program to open and write file.
  3. Specify files to be written from the command line. File writes using classes and global variables

¶ Program to read file, filter text, conversion to HEX, conversion from Hexadecimal to Signed Magnitude.S Steps for conditional statements, converting string to hexadecimalvalue, strip of white space at end, converting 12 bit hexadecimal values to 12 bit signed values.

¶ Advanced python code to cover UNIX shell commands, read lines from a text file, ‘sysargv’ command line operations, use of class and multiple functions. 

¶ Write a program to generate diamond pattern.

¶ Implement Python function calls to different classes.

¶ Python read binary files, use of struct.unpack.

¶ Python error’s with complete code examples:-

  1. TypeError: __init__() takes exactly 2 arguments (1 given),
  2. TypeError: 'str' object is not callable, TypeError: not all arguments converted during string formatting,
  3. AttributeError: ** instance has no attribute **

 

 

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