Plot that step

# -*- coding: utf-8 -*-
"""
Created on Fri Oct 25 22:30:56 2019

@author: Bruker
"""
import matplotlib.pyplot as plt

def file_reader():
    data_file = open("ltspice_step_data.txt", "r")

    line = data_file.readline()
    values = line.split("\t")


    file_content = []
    line = data_file.readline()
    while line != "":

        file_content.append(line)


        line = data_file.readline()

    return file_content


contents = file_reader()




step_length = 77

step_one = contents[1:85]
step_two = contents[86:184]
step_three = contents[185:271]

time_s1 = []
time_s2 = []
time_s3 = []

v_cap_s1 = []
v_cap_s2 = []
v_cap_s3 = []

v_source = []

for value in step_one:
    time_s1.append(float(value.split("\t")[0]))
    v_source.append(float(value.split("\t")[2]))
    print(float(value.split("\t")[1].strip("\n")))
    v_cap_s1.append(float(value.split("\t")[1].strip("\n")))


for value in step_two:
    time_s2.append(float(value.split("\t")[0]))
    v_cap_s2.append(float(value.split("\t")[1].strip("\n")))


for value in step_three:
    time_s3.append(float(value.split("\t")[0]))
    v_cap_s3.append(float(value.split("\t")[1].strip("\n")))

plt.plot(time_s1, v_source)
plt.plot(time_s1, v_cap_s1)
plt.plot(time_s2, v_cap_s2)
plt.plot(time_s3, v_cap_s3)