43 lines
1012 B
Python
43 lines
1012 B
Python
# coding: utf-8
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from argparse import ArgumentParser
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from functions import readFile, countLetters
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def checkArguments():
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args = ArgumentParser(description='Cryptanalyst')
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args.add_argument('-f', '--filename', help='Text to analyze')
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return args.parse_args()
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def main():
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args = checkArguments()
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# Read file
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dataFile = readFile(args.filename)
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# Get number of letters
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totalLetters = countLetters(dataFile)
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counts = []
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for i in range (0, 26):
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counts.append(0)
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# Count the number of letter in our text
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letterToAscii = ord('a') # Get the ASCII code
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for i in dataFile:
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l = ord(i) - letterToAscii
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if l >= 0 and l <= 26:
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counts[l] += 1
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# We calculate the sum of all character in the text
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ic = 0
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for i in range(0, len(counts)):
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sum = (counts[i] * (counts[i] - 1))
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ic += sum / (totalLetters * (totalLetters - 1))
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print(f"Index of coincidence: {ic}")
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if __name__ == "__main__":
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main()
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