Scan Adder

addition = True

data = ''
name = 'Pi'

choice = raw_input('Enter constant Choice (Pi, 2Pi, Phi, e, em, A, cat, kl, rt): ')

if choice.lower().strip() == '2pi':
    name = '2Pi'
    with open('/path/to/2pi_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'phi':
    name = 'Phi'
    with open('/path/to/phi_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'e':
    name = 'e'
    with open('/path/to/e_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'em':
    name = 'Euler-Mascheroni'
    with open('/path/to/em_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'a':
    name = 'A'
    with open('/path/to/A.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'cat':
    name = 'Catalan'
    with open('/path/to/catalan_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'kl':
    name = 'Khinchin-Levy'
    with open('/path/to/khinchin-levy_20m.txt') as the_file: data = the_file.read()
elif choice.lower().strip() == 'rt':
    name = 'Sqrt2'
    with open('/path/to/sqrt_2.txt') as the_file: data = the_file.read()
else:
    name = 'Pi'
    with open('/path/to/pi_20m.txt') as the_file: data = the_file.read()

data = data[:100000]

target = 1

while True:
    num_input = raw_input('Enter number to search for: ').strip()
    if num_input.isdigit():
        if int(num_input) > 0:
            target = int(num_input)
            break

answer = raw_input('\nPress Enter to do addition. Enter anything to do subtraction.')
if answer != '': addition = False

matches = []

print('')

for i in range(0, len(data)):
    for length in range(2, 15):
        section = data[i:i + length]
        end_of = i + length

        for j in range(1, len(section)):
            a_s = section[:j]
            b_s = section[j:]
            a = int(a_s)
            b = int(b_s)

            if addition == True:
                if a + b == target:
                    if end_of not in matches:
                        matches.append(end_of)
                        print('"' + a_s + ' ' + b_s + '" occurs at the end of ' + str(end_of) + ' digits of ' + name + ' (' + str(a) + ' + ' + str(b) + ' = ' + str(target) + ')')
            else:
                if abs(a - b) == target:
                    a_msg = str(a)
                    b_msg = str(b)

                    if a < b:
                        a_msg = str(b)
                        b_msg = str(a)

                    if end_of not in matches:
                        matches.append(end_of)
                        print('"' + a_s + ' ' + b_s + '" occurs at the end of ' + str(end_of) + ' digits of ' + name + ' (' + a_msg + ' - ' + b_msg + ' = ' + str(target) + ')')