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Python Exercise: Unpack a tuple in several variables

Python tuple: Exercise-4 with Solution

Write a Python program to unpack a tuple in several variables.

Sample Solution:-

Python Code:

#create a tuple
tuplex = 4, 8, 3 
print(tuplex)
n1, n2, n3 = tuplex
#unpack a tuple in variables
print(n1 + n2 + n3) 
#the number of variables must be equal to the number of items of the tuple
n1, n2, n3, n4= tuplex

Sample Output: 

(4, 8, 3)                                                                                                     
15                                                                                                            
Traceback (most recent call last):                                                                            
  File "32fd05c0-3096-11e7-a6a0-0b37d4d0b2c6.py", line 8, in <module>                                         
    n1, n2, n3, n4 = tuplex                                                                                   
ValueError: not enough values to unpack (expected 4, got 3)

Flowchart:

Flowchart: Unpack a tuple in several variables

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