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Python Math: Round a specified number upwards towards infinity and down towards negative infinity

Python Math: Exercise-41 with Solution

Write a Python program to round a specified number upwards towards infinity and down towards negative infinity of precision 4.

Sample Solution:-

Python Code:

import decimal
context = decimal.getcontext()
value = decimal.Decimal(1) / decimal.Decimal(17)
print("1/17 = ",value)
context.prec = 4
print("Precision: ",4)

context.rounding = getattr(decimal, 'ROUND_CEILING')
value = decimal.Decimal(1) / decimal.Decimal(17)
print("Round upwards towards infinity: ",value)

context.rounding = getattr(decimal, 'ROUND_FLOOR')
value = decimal.Decimal(1) / decimal.Decimal(17)
print("Round down towards negative infinity: ",value)

Sample Output: 

1/17 =  0.05882352941176470588235294118                                                                       
Precision:  4                                                                                                 
Round upwards towards infinity:  0.05883                                                                      
Round down towards negative infinity:  0.05882

Flowchart:

Flowchart: Round a specified number upwards towards infinity and down towards negative infinity

Python Code Editor:

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Previous: Write a Python program to round a specified decimal by setting precision (between 1 and 4).
Next: Write a Python program to get the local and default precision.

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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