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Python Math: Round a specified decimal by setting precision

Python Math: Exercise-40 with Solution

Write a Python program to round a specified decimal by setting precision (between 1 and 4).

Sample Solution:-

Python Code:

import decimal

d = decimal.Decimal('00.26598')
print("Original Number : ",d)
for i in range(1, 5):
    decimal.getcontext().prec = i
    print("Precision-",i, ':', d * 1)

Sample Output: 

Original Number :  0.26598                                                                                    
Precision- 1 : 0.3                                                                                            
Precision- 2 : 0.27                                                                                           
Precision- 3 : 0.266                                                                                          
Precision- 4 : 0.2660

Pictorial Presentation:

Python Math: Round a specified decimal by setting precision

Flowchart:

Flowchart: Round a specified decimal by setting precision

Python Code Editor:

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Previous: Write a Python program to retrieve the current global context (public properties) for all decimal.
Next: Write a Python program to round a specified number upwards towards infinity and down towards negative infinity of precision 4.

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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