import random #import a library of random commands
x = 0 #sets the variable
k = [] #creates an empty list
for j in range(0,99): #first loop : begins the programm for a new particule each time
    x = 0 #reset the initial position for each particule to 0
    for i in range(0,99): #second loop : begins the movement of the particule,
                          #going left or right
        d = random.randint(0,1) #i takes the value 1 or 0 randomly
        if d == 0: 
            x = x-1 #if d == 0, particule goes left
            k.append(x) #adds the value to the table
        else:
            x = x+1 #if d == 1, particule goes right
            k.append(x) #adds the value to the table

import matplotlib.pyplot as plt #import the library to plot
plt.xlabel('Position') #lables the x-absciss with a chosen name
plt.ylabel('Iterations') #lables the y-absciss with a chosen name
plt.title('Position of a 100 particules and the iteration of each') #gives a title 
                                                                    #to the graph
plt.hist(k, bins=30) #plots the graph as a histogram taking the list in account,
                     #and the number of bins chosen.