Answer:
Here is the Python function:
import os #module used to interact with operating system
def displayFiles(pathname): #recursive function that takes a pathname as argument
if (os.path.isdir(pathname)): #checks if specified path (argument) is an existing directory
for content in os.listdir(pathname): #gets the list of all files and directories in the directory and iterates through the items of this list of directory
contents = os.path.join(pathname, content) #joins contents of path
displayFiles(contents) #calls function recursively
else: #if pathname refers to a file
filename=pathname #sets filename to pathname
file = os.path.basename(filename) #gets base name in specified path
print("File Name: ", file) #displays the name of file
with open(filename, "r") as contents: #opens file in read mode
print("Content:") #prints Content:
for lines in contents: #iterates through the contents of file
print(lines) #displays the contents of file
Explanation:
The recursive function displayFiles contains a single argument pathname which can either be a pathname or a filename . If the given argument is pathname for directory , then the directory is opened and os.listdir returns a list containing the names of the entries in the directory given by pathname and append these contents in the list. Then this function is called recursively to print each file name and this function is applied to each name in the directory. However if the pathname refers to a file then the pathname is set to filename , the file is opened in read mode and the contents of the file are displayed.
Functions are set of related codes, that are named and grouped in a block, where they perform as a unit code.
The function in Python where comments are used to explain each line is as follows
#This imports the os module
import os
#This defines the function
def displayFiles(pathname):
#If the path name is a directory
if (os.path.isdir(pathname)):
#This iterates through the contents in the directory
for content in os.listdir(pathname):
#This joins the contents and calls the function, recursively
displayFiles(os.path.join(pathname, content))
#if otherwise that the path name is a filename
else:
#This sets the filename
fname=pathname
#This gets the base name in the path
file = os.path.basename(fname)
#This opens and reads the file
with open(fname, "r") as contents:
#This iterates and prints each lines
for lines in contents:
print(lines)
At the end of the function, the function either displays the files in the directory or the contents of the file
Read more about files at:
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