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Python: Find all the common characters in lexicographical order from two given lower case strings

Python String: Exercise-65 with Solution

Write a Python program to find all the common characters in lexicographical order from two given lower case strings. If there are no common letters print “No common characters”.

Sample Solution:-

Python Code:

from collections import Counter 
def common_chars(str1,str2): 	
	d1 = Counter(str1) 
	d2 = Counter(str2) 
	common_dict = d1 & d2 
	if len(common_dict) == 0: 
		return "No common characters."

	# list of common elements 
	common_chars = list(common_dict.elements()) 
	common_chars = sorted(common_chars) 

	return ''.join(common_chars) 

str1 = 'Python'
str2 = 'PHP'
print("Two strings: "+str1+' : '+str2)
print(common_chars(str1, str2))
str1 = 'Java'
str2 = 'PHP'
print("Two strings: "+str1+' : '+str2)
print(common_chars(str1, str2))

Sample Output:

Two strings: Python : PHP
P
Two strings: Java : PHP
No common characters.

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Python String: Find all the common characters in lexicographical order from two given lower case strings.

Flowchart:

Flowchart: Find all the common characters in lexicographical order from two given lower case strings

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Previous: Write a Python program to find maximum length of consecutive 0’s in a given binary string.
Next: Write a Python program to make two given strings (lower case, may or may not be of the same length) anagrams removing any characters from any of the strings.

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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