Using Python's with Statement for File Handling and Understanding Shell and split() Method

When using the with statement, the file object returned by open() is only available inside the block; to access its contents outside, you can read all lines into a list within the block.

Example code reads /etc/passwd , stores each line in a list, then prints each line and, if a colon is present, prints the last field (the shell) using split(":") and rstrip() to remove trailing whitespace.

filename = '/etc/passwd'

with open(filename) as file_object:

lines = file_object.readlines()

for line in lines:

print(line.rstrip())

if ":" in line:

print(line.split(":")[-1].rstrip())

The rstrip() function removes extra blank characters from the output.

A shell is a command interpreter, similar to DOS's command, with interactive and non‑interactive modes; interactive shells wait for user input, while non‑interactive shells execute commands from a file.

Python’s split() method divides a string by a specified separator, optionally limiting the number of splits, and returns a list of substrings.