longestrep.py

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file = open("pi_million_digits.txt", "r").read()
 
Q3_out = {}
sequence = ""
 
for char in file:
    if char in sequence:
        sequence += char
    else:  # put the sequence into the dict
        # workaround for initially sequence being empty
        if sequence:
            Q3_out[sequence] = Q3_out.setdefault(sequence, 0) + 1
        sequence = char
 
print(Q3_out)