Python | Ways to check string contain all same characters

Last Updated : 29 Jun, 2019

Given a list of strings, write a Python program to check whether each string has all the characters same or not. Given below are a few methods to check the same.

Method #1: Using Naive Method [Inefficient]

# Python code to demonstrate  
# to check whether string contains 
# all characters same or not 
  
# Initialising string list 
ini_list = ["aaaaaaaaaaa", "aaaaaaabaa"] 
  
# Printing initial string 
print ("Initial Strings list", ini_list) 
  
# Using Naive Method: 
flag = True
for i in ini_list: 
    for j in range(0, len(i)-1): 
        if i[j]!= i[j + 1]: 
            print ("String {} don't have all characters same".format(i)) 
            flag = False
            break
    if flag == True: 
        print ("String {} don't have all characters same".format(i)) 
         

Output:

Initial Strings list ['aaaaaaaaaaa', 'aaaaaaabaa']
String aaaaaaaaaaa don't have all characters same
String aaaaaaabaa don't have all characters same

Method #2: Using String Comparisons

# Python code to demonstrate  
# to check whether string contains 
# all characters same or not 
  
# Initialising string list 
ini_list = ["aaaaaaaaaaa", "aaaaaaabaa"] 
  
# Printing initial string 
print ("Initial Strings list", ini_list) 
  
# Using String comparison 
for i in ini_list: 
    if i == len(i)*i[0]: 
        print ("String {} have all characters same".format(i)) 
    else: 
        print ("String {} don't have all characters same".format(i)) 
         

Output:

Initial Strings list ['aaaaaaaaaaa', 'aaaaaaabaa']
String aaaaaaaaaaa have all characters same
String aaaaaaabaa don't have all characters same

Method #3: Using count comparison

# Python code to demonstrate  
# to check whether string contains 
# all characters same or not 
  
# Initialising string list 
ini_list = ["aaaaaaaaaaa", "aaaaaaabaa"] 
  
# Printing initial string 
print ("Initial Strings list", ini_list) 
  
# Using String comparison 
for i in ini_list: 
    if i.count(i[0]) == len(i): 
        print ("String {} have all characters same".format(i)) 
    else: 
        print ("String {} don't have all characters same".format(i)) 
         

Output:

Initial Strings list ['aaaaaaaaaaa', 'aaaaaaabaa']
String aaaaaaaaaaa have all characters same
String aaaaaaabaa don't have all characters same

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