Question

I would like to write a code that will read and open a text file and tell me how many “.” (full stops) it contains

I have something like this but i don’t know what to do now?!

f = open( "mustang.txt", "r" )
    a = []
    for line in f:

Answer 1

Assuming there is absolutely no danger of your file being so large it will cause your computer to run out of memory (for instance, in a production environment where users can select arbitrary files, you may not wish to use this method):

f = open("mustang.txt", "r")
count = f.read().count('.')
f.close()
print count

More properly:

with open("mustang.txt", "r") as f:
    count = f.read().count('.')
print count