Plotting Assignment (use Plotly Express)

Write a Python program, called histogram.py, that reads a text file and plots a histogram of letter counts for each letter of the alphabet.

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Here are couple of text files for you to test your program against:

lipogram.txt

ra.txt

NOTES:

1. the Python commands to read from file into a string object is:

     with open(fname) as f:
       data = f.read().lower()
   

2. Use the String object's count() method to get the count of character c in a string.