LoopsAndFiles.py

#Program:  LoopsAndFiles.py
#Purpose:  Test different ways to process data from files
#Author:   Adelaida Medlock
#Date:     March 9, 2024

#count how many times a word appear in each line of a file
def countWordPerLine():
    filename = input('Enter the name of the file to open: ')
    word = input('Enter the word you want to count: ')
    
    try :
        inFile = open(filename)
        lines = inFile.readlines()
        inFile.close()

        for index in range(len(lines)) :
            count = lines[index].count(word)
            print(word, 'appears', count, 'time(s) in line #', index)
    
    except FileNotFoundError :
        print('Could not find', filename)

# Read a bunch of floating-point values from a file,
# calculate some basic stats, and print results to screen
# and save the results in an output file as well
def computeStats():
    # loop until we get a value filename
    validFile = False
    while not validFile :
        try :
            filename = input('Enter the name of the data file: ')
            inFile = open(filename)
            validFile = True
        except FileNotFoundError :
            print('Could not find', filename, 'Try again')
    
    # read data from file and process it
    lines = inFile.readlines()
    inFile.close()
    count = 0
    total = 0.0
    for item in lines :
        count += 1
        total = total + float(item)
    average = total / count
    
    # display results
    print('\nStats for data in file')
    print('Number of values:', count)
    print('Sum of values: {:.2f}'.format(total))
    print('Average of values: {:.2f}'.format(average))
    
    # saving results to output file
    outFile = open('stats.txt', 'w')
    outFile.write('Stats for data in file\n')
    outFile.write('Number of values: {:d}\n'.format(count))
    outFile.write('Sum of values: {:.2f}\n'.format(total))
    outFile.write('Average of values: {:.2f}\n'.format(average))
    outFile.close()

# Calculate stats for values stored in a file
# Save results in a an output file
# Demo how to use the with statement so files
# are automatically closed
def withDemo(filename):
    with open(filename, 'r') as inFile :
        total = 0.0
        count = 0
        
        # Read one line at the time
        line = inFile.readline() 
        while line != '' :  # an empty string indicates the EOF
            total = total + float(line) 
            count += 1
            line = inFile.readline()
            
        # Saving results to output file
        outFile = open('stats2.txt', 'w')
        outFile.write('Stats for data in file\n')
        outFile.write('Number of values: {:d}\n'.format(count))
        outFile.write('Sum of values: {:.2f}\n'.format(total))
        outFile.write('Average of values: {:.2f}\n'.format(total / count))
        
        # By using with both files are automatically closed

    # Display results
    print('\nStats for data in file')
    print('Number of values:', count)
    print('Sum of values: {:.2f}'.format(total))
    print('Average of values: {:.2f}'.format(total / count))
    print('Results have been saved to file stat2.txt')