I was exploring the online python documentation . I found an interesting way of opening and processing file content.

For opening and getting the content from file the process will be like :

        txt = open("your_file",'r') # Open file
        txtc = txt.read() # Read total content
        txt.close() # close file object 

You can avoid the use of file.close() if you are using the ‘with’ statement. In normal way we will be reading and printing the content like:

(1) python txt = open("my_text.txt",'r') # Open file txtcont = txt.read() txt.close() print txtcont # Printing the contents of the file.

Or (2)     ```python
    txt = open("my_text.txt",'r') # Open file
    txtcont = txt.readlines() # Read lines from file and store to a list
    txt.close()
    
    
    for line in txtcont:
        print line # Prints line by line
    ```

The above given example can be done in another way (Copied from pydoc) (3) python f = open("hello.txt") try: for line in f: print line finally: f.close()

The items 2 and 3 can be implemented with ‘with’ in the following way (in Python 2.6).

    with open("my_file") as txt:
        for line in txt:
            print line

Instead of five/six lines we are using three lines. beautiful code !!!

You may ask where is the .close() function. While using ‘with’ for opening a file, the opened file will be closed when the ‘with’ block is exited. Means the file locally scoped in the ‘with’ block.

I just played with ‘with’ to know where all the operations which is done with normal ‘open()’ is possible or not. I am posting the codes below.

    import sys
    
    warr = []    
    with open(sys.argv[1]) as txt:
        txtc = txt.read()
        words = txtc.split()
        warr.extend(words)

    for wa in warr:
        print warr

What I tried here is open a file with ‘with’, split in to words and append to a list outside the scope of ‘with’ block, and print each element in the list.

    import sys
        
    with open(sys.argv[1]) as txt:
        txtc = txt.readlines() #Read lines and store to list
        for l in txtc:
            print l # Print each line

Happy SFD !!!!! Happy Hacking !!!!!!!!

Migrated from my old blog jaganadhg.freeflux.net