Python-сообщество

import matplotlib.pyplot as plt
from pylab import *
import cmath
def sf(prompt):
""" """
    error_message = "Value must be integer and greater or equal than zero"
    while True:
        val = raw_input(prompt)
        try:
            val = float(val)
        except ValueError:
            print(error_message)
            continue
        if val <= 0:
            print(error_message)
            continue
        return val
def petrogen_elements():
    """Input and calculations the main parameters for
    pertogen elements"""
    print "Please enter Petrogen elements: \r"
    SiO2 = sf("SiO2: ")
    Al2O3= sf("Al2O3: ")
    Na2O = sf("Na2O: ")
    K2O =  sf("K2O: ")
    
    petro = [SiO2,TiO2,Al2O3,]                    
    
    Sum = sum(petro)
    
    Alcal = Na2O + K2O
    TypeA lcal= Na2O / K2O
    Ka= (Na2O + K2O)/ Al2O3 
 
    print  '-'*20, "\r Alcal: %s \r TypeAlcal: %s  \
     \r Ka: %s \r" % (Alcal, TypeAlcal,Ka,)
    
petrogen_elements()

SiO2 Al2O3 Na2O K2O
32 12 0.21 0.1
45 8 7.54 5

import csv
def parse_file(fname):
    with open(fname, "rt", encoding="utf-8") as f:
        for _set in csv.DictReader(f, delimiter=" "):
            _set = {k: float(v) for k, v in _set.items()}
            petrogen_elements(_set)

from collections import namedtuple
SET = namedtuple("SET", "SiO2, Al2O3, Na2O, K2O")
def parse_file(fname):
    with open(fname, "rt", encoding="utf-8") as f:
        next(f) # пропускаем строку заголовков, чтобы не менять формат файла
        for line in f:
            _set = SET(*map(float, line.split()))
            petrogen_elements(_set)

def petrogen_elements(_set):
    Sum = sum((_set["SiO2"], _set["TiO2"], _set["Al2O3"]))
    
    Alcal = _set["Na2O"] + _set["K2O"]
    TypeAlcal= _set["Na2O"] / _set["K2O"]
    Ka= (_set["Na2O"] + _set["K2O"]) / _set["Al2O3"]
 
    print("{}\r Alcal: {}\r TypeAlcal: {}\r Ka: {}".format('-'*20, Alcal, TypeAlcal, Ka))

import xlrd3 as xlrd
from collections import namedtuple
SET = namedtuple("SET", "SiO2, Al2O3, Na2O, K2O")
def parse_file(fname):
    ws = xlrd.open_workbook(fname).sheets()[0]
    for i in range(1, ws.nrows): # пропускаем строку заголовков
        _set = SET(*ws.row_values(i, end_colx=ws.ncols))
        petrogen_elements(_set)