Question

Random characters You decide to create a program characters.py that fills a two-dimensional list with random symbols, and then performs some operations on it. To create a grid with 5 rows and 4 columns, you include this line in your main function: grid = [[0]*4 for i in range(5)] You then write four helper functions: fill_grid(g) fills grid with random symbols print_grid(g) prints grid count(g, s) counts how many times a symbol occurs replace(g, s1, s2) replaces one symbol with another Your main function asks the user for the symbol to count and the one to replace it with, and displays the grid at each step. A sample run might look like this:

Answer 1

import random #random package

def replace(g,s1,s2): #replace function
   for i in range(len(g)): #iterates length of grid times
       for j in range(len(g[i])): #iterates through each column
           if (g[i][j]==s1): #if symbol is found
               g[i][j]=s2 #replaces the old symbol with new symbol
   return g #returns grid

def count(g,s): #count function
   count=0 #count
   for i in g: #iterates through each row
       for j in i: #iterates through each column
           if (j==s): #if symbol is found
               count+=1 #count increases
   print("Count of symbol",s,"is",count) #prints count

def fill_grid(g): #fill_grid function
   g = [[0]*4 for i in range(5)]
   for i in range(0,len(g)):
       for j in range(4):
           g[i][j]=chr(random.randrange(33,47)) #fills the grid with char( random number )
   return g

def print_grid(g):
   for i in g:
       for j in i:
           print(j," ",end="")
       print("\n")
      
def main():
   g=[]
   g=fill_grid(g)
   print_grid(g)
  
   s=input("Enter symbol to count")
   count(g,s)
   print_grid(g)
  
   s1=s
   s2=input("Enter new symbol")
   g=replace(g,s1,s2)
   print_grid(g)

if __name__=="__main__":
   main()