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Python: Compute the square of first N Fibonacci numbers, use map function and generate a list of the numbers

Python map: Exercise-10 with Solution

Write a Python program to compute the square of first N Fibonacci numbers, using map function and generate a list of the numbers.

Fibonacci numbers:

From Wikipedia,
In mathematics, the Fibonacci numbers, commonly denoted Fn, form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is,

F0 = 0,   F1 = 1,

and

Fn = Fn - 1 + Fn - 2,

for n > 1.

The beginning of the sequence is thus:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144,....

Sample Solution:

Python Code :

import itertools
n = 10
def fibonacci_nums(x=0, y=1):
    yield x
    while True:
        yield y
        x, y = y, x + y
print("First 10 Fibonacci numbers:")
result = list(itertools.islice(fibonacci_nums(), n))
print(result)
square = lambda x: x * x 
print("\nAfter squaring said numbers of the list:")
print(list(map(square, result)))

Sample Output:

First 10 Fibonacci numbers:
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

After squaring said numbers of the list:
[0, 1, 1, 4, 9, 25, 64, 169, 441, 1156]

Python Code Editor:

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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