File Parsing using Python

Objective :

   The aim of this project is do file parsing using python for different data provided in the file.


   File Parsing :

        Text parsing is a common programming task that splits the given sequence of characters or values (text) into smaller parts based on some rules. It has been used in a wide variety of applications ranging from simple file parsing to large scale natural language processing.

  • Import numpy module , matplotlib.pyplot  for plotting graph and also the math module for math operations.
  • Assign empty array for each data such crank angle, pressure, temperature and so on
  • now the basic operation to perform file parsing is to make the program to read the file. It can be executed by open command.
  • Thus skipping the lines in the data which contains' #' in it by creating a for a loop.
  • Then create a loop which helps to extract third only which contains the data wanted.
  • Now append all the values to the empty array accordingly
  • Now to perform the input method which helps the user to provide necessary data they wanted which is called a  script.
  • The program should provide the value that user define and the script has to be made accordingly.
  • In this program, the graph between the two data is generated according to the user-defined.
  • Also, the script has to provide value for Area, power, specific fuel consumption.

                  Area  = work done in the curve.

  • It can be calculated by integrating the cycle by using the command called Trapz.  

                 power = work done /  time

  • Specific fuel consumption = rate of fuel consumption/ power
  • Thus the output must be shown as such in the below image.






import numpy as np
import matplotlib.pyplot as plt
import math

crank = []
pressure = []
max_pressure = []
min_pressure = []
mean_temp = []
max_temp = []
min_temp = []
volume =[]
mass = []
density =[]
intergrated_hr = []
c_p = []
c_v =[]
gamma =[]
dynamic_viscocity = []


#file parsing starts here

d = (input('enter file name'))

if d.endswith('out') is True:

	for line in open(d):
		if '#' not in line:


	a = ([crank,pressure,max_pressure,min_pressure,mean_temp,max_temp,min_temp,volume,mass,density,intergrated_hr,hr_rate,c_p,c_v,gamma,kinematic_viscosity,dynamic_viscocity])

	x = int(input("give the first column number."))
	y = int(input("give the second column number."))
	plt.plot(a[x],a[y], color = 'blue', linewidth = '3')

	line_count = 1

	for line in open(d,'r'):
		if "#" in line:
			if line_count is 3:




			line_count = line_count+1

	r =1
	h =[]
	for text in open(d,'r'):
		if '#' in text:
			if r is 4:
				k = (text.split()[1:18])

			r =r+1

	print('file type is not recognized')

#in mega watt




A =np.trapz(a[1],a[7]) 

rps = rpm/60

p = A * rps *1000

P = p /0.746
print('horsepower is',P)
print('power in kw is',p)

BSFC = (20*pow(10,-6)*3600)/0.8*p
print('specific fuel consumption is',BSFC)



  • Thus the above program indicates how the file parsing is done.
  • Also shown the example of the user interface.

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The End