Python : Read Text File Character By Character In Loop

For example, there's a text file which contains numbers from 0 to 9: 0123456789 Using the following function, I'd like to get output like this: >>> print_char('filename'

Solution 1:

I'd approach this differently, and make a function that takes in a filename that returns a generator:

defreader(filename):
    withopen(filename) as f:
        whileTrue:
            # read next character
            char = f.read(1)
            # if not EOF, then at least 1 character was read, and # this is not emptyif char:
                yield char
            else:
                return

Then you need to give the filename only once

r = reader('filename')

And the file is kept opened for much faster operation. To fetch next character, use the next built-in function

print(next(r))  # 0print(next(r))  # 1
...

You can also use itertools, such as islice on this object slice characters, or use that in a for loop:

# skip characters until newlinefor c in r:
    if r == '\n':
        break