Python Bisect: Find the index position of the largest value smaller than a given number in a sorted list using Binary Search
Python Bisect: Exercise-5 with Solution
Write a Python program to find the index position of the largest value smaller than a given number in a sorted list using Binary Search (bisect).
Sample Solution:
Python Code:
from bisect import bisect_left
def Binary_Search(l, x):
i = bisect_left(l, x)
if i:
return (i-1)
else:
return -1
nums = [1, 2, 3, 4, 8, 8, 10, 12]
x = 5
num_position = Binary_Search(nums, x)
if num_position == -1:
print("Not found..!")
else:
print("Largest value smaller than ", x, " is at index ", num_position )
Sample Output:
Largest value smaller than 5 is at index 3
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Next: Write a Python program to find the index position of the last occurrence of a given number in a sorted list using Binary Search (bisect).What is the difficulty level of this exercise?
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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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