Python: Count repeated characters in a string

Last update on April 19 2025 13:05:23 (UTC/GMT +8 hours)

Count repeated characters in string.

Write a python program to count repeated characters in a string.

Sample Solution:

Python Code:

# Import the 'collections' module to use the 'defaultdict' class.
import collections

# Define a string 'str1' with a sentence.
str1 = 'thequickbrownfoxjumpsoverthelazydog'

# Create a defaultdict 'd' with integer values as the default type.
d = collections.defaultdict(int)

# Iterate through each character in the string 'str1'.
# Update the counts of each character in the 'd' dictionary.
for c in str1:
    d[c] += 1

# Iterate through the characters in 'd' in descending order of their counts.
for c in sorted(d, key=d.get, reverse=True):
    # Check if the character occurs more than once.
    if d[c] > 1:
        # Print the character and its count.
        print('%s %d' % (c, d[c])) 

Sample Output:

o 4                                                                                                           
e 3                                                                                                           
h 2                                                                                                           
t 2                                                                                                           
r 2                                                                                                           
u 2                             

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to count and display each character in a string that occurs more than once using collections.Counter.
• Write a Python program to iterate over a string and print only those characters that appear repeatedly along with their counts.
• Write a Python program to use a dictionary to tally character occurrences and then output only the characters with counts greater than one.
• Write a Python program to implement a function that returns a formatted string showing repeated characters and their frequencies.

Go to:

• Python Data Type String Exercises Home ↩
• Python Exercises Home ↩

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