os python functions code example

Example 1: import os in python meaning

import os

Executing a shell command
os.system()    

Get the users environment 
os.environ()   

#Returns the current working directory.
os.getcwd()   

Return the real group id of the current process.
os.getgid()       

Return the current process’s user id.
os.getuid()    

Returns the real process ID of the current process.
os.getpid()     

Set the current numeric umask and return the previous umask.
os.umask(mask)   

Return information identifying the current operating system.
os.uname()     

Change the root directory of the current process to path.
os.chroot(path)   

Return a list of the entries in the directory given by path.
os.listdir(path) 

Create a directory named path with numeric mode mode.
os.mkdir(path)    

Recursive directory creation function.
os.makedirs(path)  

Remove (delete) the file path.
os.remove(path)    

Remove directories recursively.
os.removedirs(path) 

Rename the file or directory src to dst.
os.rename(src, dst)  

Remove (delete) the directory path.
os.rmdir(path)

Example 2: python functions

# first we have to write 'def'
# then our function name followed by ()
# and a ':' abd defining  block of code

def multiply():     # naming convention could be same as variable for functions
    product = 10.5 * 4
    return product


product = multiply()
print(product)

Example 3: python functions

# Python Functions
def a_function(): #def FUNCTIONNAMEHERE(): Function content
  print("Hello World!")
  return 0
def answerValid(prompt, correct_answers, invalid): # Functions can also have parameters, or variables that can be used only in tha function
  while True:
    user = input(prompt)
    if user in correct_answers:
      break 
      return user # Example Function
   	else:
      print(invalid)

a_function() # To call a function; Prints 'Hello World!'
# But if this is done:
function_called = a_function() # function_called would contain a 0, because the function returns 0
answer = answerValid("What is 8 * 8?", [64], "Invalid Option")
print(answer) # Prints 64, because that is the only possible answer

Example 4: import os in python meaning

The OS module in Python provides a way of using operating system dependent
functionality. 

The functions that the OS module provides allows you to interface with the
underlying operating system that Python is running on – be that Windows, Mac or
Linux. 

You can find important information about your location or about the process. 

In this post I will show some of these functions.

Example 5: python os module

#the os module provides an operating system interface from Python
import os
#prints the name of the operating system
print(os.name)
#prints the absolute path for the module
print(os.getcwd())

Example 6: os module in python

# Delete everything reachable from the directory named in "top",
# assuming there are no symbolic links.
# CAUTION:  This is dangerous!  For example, if top == '/', it
# could delete all your disk files.
import os
for root, dirs, files in os.walk(top, topdown=False):
    for name in files:
        os.remove(os.path.join(root, name))
    for name in dirs:
        os.rmdir(os.path.join(root, name))