I can't understand this code..

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)))

Answer 1

Overview:
The program prints the percentage of frequency for each letter of the alphabet in a user-specified file.

The sequence is basically:
1. Prompt user for a file name.
2. Print frequency percentage for each letter of the alphabet.

count_char is named very clearly. It counts the number of occurrences of the specified character in the string called text.
count_char is used as part of the frequency percentage calculation.

Let me know if you have a more specific question about a specific part of the program.

Answer 2

Already answered:

https://www.sololearn.com/Discuss/2377375/?ref=app