Explain this python code please...

Question

def count_char(text, char):
count = 0
for c in text:
if c == char:
count += 1
return count

filename = input("Enter a filename: ")
with open(filename) as f:
text = f.read()

for char in "abcdefghijklmnopqrstuvwxyz":
perc = 100 * count_char(text, char) / len(text)
print("{0} - {1}%".format(char, round(perc, 2)))

REALLY THANK YOU.
https://code.sololearn.com/380/#py

Answer 1

It first defines the count_char() method which counts a given character within a text. Then it opens a file for reading and reads it.
The main iterator goes over a collection of letters and counts for occurrences of each of them in the text. Finally, it prints out those occurrences in a percentage format.

Answer 2

In short: It simply reads all the lines in a file, and then iterates through all characters (counting them along the way). It then prints the occurrence (in percentage) of each letter.

The function "count_char" counts the amount of characters in a given string "text" that match a given character "char".

The rest of the count has Python opening a file, storing it into a variable "text", then looping through every letter of the alphabet and the text string, counting its occurrence.