Program to Check whether String Contains Unique Characters

Python Program to Check whether String Contains Unique Characters

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Given a string, the task is to check whether the given string contains all the unique characters in Python.

Examples:

Example1:

Input:

Given string =btech

Output:

The given string [ btech ] contains unique characters

Example2:

Input:

Given string =bteceeh

Output:

The given string [ bteceeh ] contains duplicate characters

Program to Check whether String Contains Unique Characters in Python

Below are the ways to check whether the given string contains unique characters in python.

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Method #1: Using Counter() (Hashing , Static Input)

Approach:

  • Import the Counter() function from collections using the import keyword.
  • Give the string as static input and store it in a variable.
  • Calculate the frequency of all the given string elements using the Counter() function which returns the element and its frequency as key-value pair and store this dictionary in a variable(say strngfreqelements)
  • Calculate the length of this frequency dictionary using the len() function and store it in a variable.
  • Calculate the length of the given string using the len() function and store it in another variable.
  • Check if both lengths are equal or not using the If conditional statement.
  • If both lengths are equal then the given string contains all the unique characters.
  • Else the given string contains duplicate characters.
  • The Exit of the program.

Below is the implementation:

# Import the Counter() function from collections using the import keyword.
from collections import Counter
# Give the string as static input and store it in a variable.
givenstrng = 'btech'
# Calculate the frequency of all the given string elements
# using the Counter() function which returns the element
# and its frequency as key-value pair and
# store this dictionary in a variable(say strngfreqelements)
strngfreqelements = Counter(givenstrng)
# Calculate the length of this frequency dictionary
# using the len() function and store it in a variable.
lengthfreq = len(strngfreqelements)
# Calculate the length of the given string using
# the len() function and store it in another variable.
lengthstrng = len(givenstrng)
# Check if both lengths are equal or not using the If conditional statement.
# If both lengths are equal then the given string contains all the unique characters.
if(lengthfreq == lengthstrng):
    print('The given string [', givenstrng, '] contains unique characters')
# Else the given string contains duplicate characters.
else:
    print('The given string [', givenstrng, '] contains duplicate characters')

Output:

The given string [ btech ] contains unique characters

Method #2: Using Counter() (Hashing , User Input)

Approach:

  • Import the Counter() function from collections using the import keyword.
  • Give the string as user input using the input() function and store it in a variable.
  • Calculate the frequency of all the given string elements using the Counter() function which returns the element and its frequency as key-value pair and store this dictionary in a variable(say strngfreqelements)
  • Calculate the length of this frequency dictionary using the len() function and store it in a variable.
  • Calculate the length of the given string using the len() function and store it in another variable.
  • Check if both lengths are equal or not using the If conditional statement.
  • If both lengths are equal then the given string contains all the unique characters.
  • Else the given string contains duplicate characters.
  • The Exit of the program.

Below is the implementation:

# Import the Counter() function from collections using the import keyword.
from collections import Counter
# Give the string as user input using the input() function and store it in a variable.
givenstrng = input('Enter some random string = ')
# Calculate the frequency of all the given string elements
# using the Counter() function which returns the element
# and its frequency as key-value pair and
# store this dictionary in a variable(say strngfreqelements)
strngfreqelements = Counter(givenstrng)
# Calculate the length of this frequency dictionary
# using the len() function and store it in a variable.
lengthfreq = len(strngfreqelements)
# Calculate the length of the given string using
# the len() function and store it in another variable.
lengthstrng = len(givenstrng)
# Check if both lengths are equal or not using the If conditional statement.
# If both lengths are equal then the given string contains all the unique characters.
if(lengthfreq == lengthstrng):
    print('The given string [', givenstrng, '] contains unique characters')
# Else the given string contains duplicate characters.
else:
    print('The given string [', givenstrng, '] contains duplicate characters')

Output:

Enter some random string = oneplus
The given string [ oneplus ] contains unique characters

Method #3: Using set() method (Static Input)

Approach:

  • Give the string as static input and store it in a variable.
  • Convert this string to set using set() function and store it in a variable.
  • Calculate the length of this set using the len() function and store it in a variable.
  • Calculate the length of the given string using the len() function and store it in another variable.
  • Check if both lengths are equal or not using the If conditional statement.
  • If both lengths are equal then the given string contains all the unique characters.
  • Else the given string contains duplicate characters.
  • The Exit of the program.

Below is the implementation:

# Give the string as static input and store it in a variable.
givenstrng = 'bteceeh'
# Convert this string to set using set() function and store it in a variable.
strngset = set(givenstrng)
# Calculate the length of this set using the len() function and store it in a variable.
lengthfreq = len(strngset)
# Calculate the length of the given string using
# the len() function and store it in another variable.
lengthstrng = len(givenstrng)
# Check if both lengths are equal or not using the If conditional statement.
# If both lengths are equal then the given string contains all the unique characters.
if(lengthfreq == lengthstrng):
    print('The given string [', givenstrng, '] contains unique characters')
# Else the given string contains duplicate characters.
else:
    print('The given string [', givenstrng, '] contains duplicate characters')

Output:

The given string [ bteceeh ] contains duplicate characters

Method #4: Using set() method (User Input)

Approach:

  • Give the string as static input and store it in a variable.
  • Give the string as user input using the input() function and store it in a variable.
  • Calculate the length of this set using the len() function and store it in a variable.
  • Calculate the length of the given string using the len() function and store it in another variable.
  • Check if both lengths are equal or not using the If conditional statement.
  • If both lengths are equal then the given string contains all the unique characters.
  • Else the given string contains duplicate characters.
  • The Exit of the program.

Below is the implementation:

# Give the string as user input using the input() function and store it in a variable.
givenstrng = input('Enter some random string = ')
# Convert this string to set using set() function and store it in a variable.
strngset = set(givenstrng)
# Calculate the length of this set using the len() function and store it in a variable.
lengthfreq = len(strngset)
# Calculate the length of the given string using
# the len() function and store it in another variable.
lengthstrng = len(givenstrng)
# Check if both lengths are equal or not using the If conditional statement.
# If both lengths are equal then the given string contains all the unique characters.
if(lengthfreq == lengthstrng):
    print('The given string [', givenstrng, '] contains unique characters')
# Else the given string contains duplicate characters.
else:
    print('The given string [', givenstrng, '] contains duplicate characters')

Output:

Enter some random string = xiaomi
The given string [ xiaomi ] contains duplicate characters

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