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Python Math: Print the floating point from mantissa, exponent pair

Python Math: Exercise-58 with Solution

Write a Python program to print the floating point from mantissa, exponent pair.

Sample Solution:-

Python Code:

import math

print('{:^7}  {:^8}  {:^17}'.format('Mantissa', 'Exponent', 'Floating point value'))
print('{:-^8}  {:-^8}  {:-^20}'.format('', '', ''))

for m, e in [ (0.7, -3),
              (0.3,  0),
              (0.5,  3),
              ]:
    x = math.ldexp(m, e)
    print('{:7.2f}  {:7d}  {:7.2f}'.format(m, e, x))
	

Sample Output:

Mantissa  Exponent  Floating point value                                                                      
--------  --------  --------------------                                                                      
   0.70       -3     0.09                                                                                     
   0.30        0     0.30                                                                                     
   0.50        3     4.00
   

Flowchart:

Flowchart: Print the floating point from mantissa, exponent pair

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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