Python Math: Get the sum of the powers of all the numbers from start to end (both inclusive)
Python Math: Exercise-85 with Solution
Write a Python program to get the sum of the powers of all the numbers from start to end (both inclusive).
- Use range() in combination with a list comprehension to create a list of elements in the desired range raised to the given power.
- Use sum() to add the values together.
- Omit the second argument, power, to use a default power of 2.
- Omit the third argument, start, to use a default starting value of 1.
Sample Solution:
Python Code:
def sum_of_powers(end, power = 2, start = 1):
return sum([(i) ** power for i in range(start, end + 1)])
print(sum_of_powers(12))
print(sum_of_powers(12, 3))
print(sum_of_powers(12, 5, 7))
Sample Output:
650 6084 618507
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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
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