Python: Count number of substrings with same first and last characters of a given string
Python String: Exercise-80 with Solution
Write a Python program to count number of substrings with same first and last characters of a given string.
Sample Solution:-
Python Code:
def no_of_substring_with_equalEnds(str1):
result = 0;
n = len(str1);
for i in range(n):
for j in range(i, n):
if (str1[i] == str1[j]):
result = result + 1
return result
str1 = input("Input a string: ")
print(no_of_substring_with_equalEnds(str1))
Sample Output:
Input a string: abc 3
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Previous: Write a Python program to find smallest and largest word in a given string.
Next: Write a Python program to find the index of a given string at which a given substring starts. If the substring is not found in the given string return 'Not found'.
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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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