CODE CHALLENGE: Implement LinearSpectrum.
     Input: An amino acid string Peptide.
     Output: The linear spectrum of Peptide.

Sample Input:

NQEL

Sample Output:

0 113 114 128 129 242 242 257 370 371 484

def spectrum(Peptide):
    linear_spec = []
    mass = []
    mass.append(0)
    linear_spec.append(0)
    f = open('aa_mass.txt')
    lines = f.readlines()
    for i in range(0, len(Peptide)):  
        for line in lines:
             if line[0] == Peptide[i]:
                #print (int(line[2:int(len(line))]))
                mass.append(int(mass[i]) + int(line[2:int(len(line))]))
    mass.sort()
    #print (mass)
    for i in range(0, len(mass)-1):
        for j in range(i+1, len(mass)):
            #print()
            #print (mass[j] - mass[i])
            linear_spec.append(mass[j]-mass[i])
    f.close()
    linear_spec.sort()
    for i in range(len(linear_spec)):
        linear_spec[i] = str(linear_spec[i])
    return " ".join(linear_spec)
   

print (spectrum("NQEL"))

Легко)) всего то два дня по часу.. и correct!