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Python Math: Round up a number to specified digits

Python Math: Exercise-69 with Solution

Write a Python function to round up a number to specified digits.

Sample Solution:-

Python Code:

import math

def roundup(a, digits=0):
    n = 10**-digits
    return round(math.ceil(a / n) * n, digits)

x = 123.01247
print("Original  Number: ",x)
print(roundup(x, 0))
print(roundup(x, 1))
print(roundup(x, 2))
print(roundup(x, 3))

Sample Output:

Original  Number:  123.01247                                                                                  
124                                                                                                           
123.1                                                                                                         
123.02                                                                                                        
123.013 

Flowchart:

Flowchart: Round up a number to specified digits

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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