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Python: Round a floating-point number to specified number

Python Basic: Exercise-119 with Solution

Write a Python program to round a floating-point number to specified number decimal places.

Sample Solution:

Round to specified Decimals using %f Function:

Python Code:

order_amt = 212.374
print('\nThe total order amount comes to %f' % order_amt)
print('The total order amount comes to %.2f' % order_amt)
print()

Sample Output: 

The total order amount comes to 212.374000
The total order amount comes to 212.37

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Round to specified Decimals using format() Function:

Python Code:

order_amt = 212.374
print("\nThe total order amount comes to {:0.6f}".format(order_amt))
print("\nThe total order amount comes to {:0.2f}".format(order_amt))

Sample Output: 

The total order amount comes to 212.374000

The total order amount comes to 212.37

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

 

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Next: Write a Python program to format a specified string limiting the length of a string.

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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