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Python: Empty a variable without destroying it

Python Basic: Exercise-122 with Solution

Write a Python program to empty a variable without destroying it.

type() returns the type of an object, which when called produces an 'empty' new value.

Sample data: n=20
d = {"x":200}
Expected Output: 0
{}

Sample Solution-1:

Python Code:

n = 20
d = {"x":200}
l = [1,3,5]
t= (5,7,8)
print(type(n)())
print(type(d)())
print(type(l)())
print(type(t)())
          

Sample Output:

0
{}
[]
()

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

def Empty_Var(lst):
   return [type(i)() for i in lst]
lst = ["python",{"x":12},[10,12,"sfsd"], (4,5), 200]
print("Original objects:")
print(lst)
print("\nEmpty the said variables without destroying it:")
print(Empty_Var(lst))
          

Sample Output:

Original objects:
['python', {'x': 12}, [10, 12, 'sfsd'], (4, 5), 200]

Empty the said variables without destroying it:
['', {}, [], (), 0]

Flowchart:

Flowchart: Empty a variable without destroying it.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

 

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m