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Python: Display a given decimal value in scientific notation

Python module: Exercise-7 with Solution

Write a Python program to display a given decimal value in scientific notation. Use decimal.Decimal

Sample Solution:

Python Code:

import decimal
#Source: https://bit.ly/2SfZEtL
def format_e(n):
    a = '%E' % n
    return a.split('E')[0].rstrip('0').rstrip('.') + 'E' + a.split('E')[1]

print("Original decimal value: "+ "40800000000.00000000000000")
print("Scientific notation of the said decimal value:")
print(format_e(decimal.Decimal('40800000000.00000000000000')))
print("\nOriginal decimal value: "+ "40000000000.00000000000000")
print("Scientific notation of the said decimal value:")
print(format_e(decimal.Decimal('40000000000.00000000000000')))
print("\nOriginal decimal value: "+ "40812300000.00000000000000")
print("Scientific notation of the said decimal value:")
print(format_e(decimal.Decimal('40812300000.00000000000000')))

Sample Output: 

Original decimal value: 40800000000.00000000000000
Scientific notation of the said decimal value:
4.08E+10

Original decimal value: 40000000000.00000000000000
Scientific notation of the said decimal value:
4E+10

Original decimal value: 40812300000.00000000000000
Scientific notation of the said decimal value:
4.08123E+10

Flowchart:

Flowchart: Display a given decimal value in scientific notation.

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Python Code Editor:

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Previous: Write a Python program to configure the rounding to round to the nearest, with ties going to the nearest even integer.
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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