Count Occurrences of Letters in Text/String With Python | Frequency of Letters in String in Python

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Create a python program to count the number of occurrences of each character in a string and calculate what percentage it is of the total (frequency). This tool could be used to break substitution ciphers like the Caesar Cipher.

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I'm Fabio, I started programming with Python a lot of years ago and I fell in love with this world.
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[FabioMusanni]

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Thank you for the support!❤

[koyha]

Excellent video! I am making a Scrabble-like game and these kinds of videos are exactly what I need

[danimatviolin]

Such great content!!! Thanks a lot for sharing 😀

[boudescotch]

How do you have so few subs ? Your content is so great, keep it up !!!

[pro.empire]

is this for to find an item? iam trying to understand this code is use for?

[venkataramanapaik]

Very good problem. I have done it a little different using various modules and concepts. Here's the code:

from collections import Counter, defaultdict
from string import ascii_lowercase
text = """
I'm Fabio, I started programming with Python a lot of years ago and I fell in love with this world.
I started this Youtube channel to help you during your own journey and I hope that my help can make you an amazing programmer who loves this world as I do.
Welcome on board!!
"""

print(text)
total_chars = len(text)
print(total_chars) # total chars in the text
print(ascii_lowercase) # lowercase letters using string module

occur_counter = Counter(text.lower()) # using Counter from collections module
print(occur_counter)
for key in list(occur_counter.keys()): # removing non-letter chars
if key not in ascii_lowercase:
del occur_counter[key]
print(occur_counter)
total_chars_letters = sum(occur_counter.values()) # total chars in the text of letters
print(total_chars_letters)

total_chars_letters = 0
occur_dict = defaultdict(int) # another way using defaultdict from collections module
for ch in text.lower():
if ch in ascii_lowercase:
occur_dict[ch] += 1
total_chars_letters +=1 # calculating total chars in the loop itself, can use sum as before

print(occur_dict)
print(total_chars_letters)

### get_percentage = ((key, for key, val in sorted(occur_dict.items(), key=lambda x: x[1], reverse = True)) # this is a generator expression

def get_percentage(): # this is generator function which is readable similar to generator expression
for key, val in sorted(occur_dict.items(), key = lambda x: x[1], reverse = True): # using lambda function in key parameter of sorted function to sort according to value in the dict
yield key, (val/total_chars_letters)*100 # yield the percentage

for item in get_percentage(): # generator returns an iterator so loop over it
print(f'%ge of "{item[0]}": {item[1]:.4f}')

print(occur_counter == occur_dict) # just to verify if key value pairs are equal in both Counter and defaultdict