Question

i=2
j=0
while(i!=len(data)):
if(data[i][0][0]>="A" and data[i][0][0]<="E" and data[i][1]=="Mammal"):
print(data[i][0])
i=i+1

Could you explain what the first 2 lines of code mean in this program?

As well as the while loop regarding the "data[i][0][0]" and "data[i][0]" in the fourth line?

Answer 1

// declare a variable i and initialize it to 2. To initialize means to provide an initialize value to the variable

i=2

// declare a variable j and initialize it to 0.
j=0

//while loop - it is used for iteration

//data is an array . The while loop will check if the value of i is not equal to the length of the data

//If true, program control will go to the while block

//If false, it will go to the statement outside the block
while(i!=len(data)):

//This if condition will check if ith row's 1st column element is between A and E ie. if it is A, B, C, D, E . Also, it will check if second column of ith row is equal to Mammal

//If the conditions are true. the program control will go to the next program block other wise not
if(data[i][0][0]>="A" and data[i][0][0]<="E" and data[i][1]=="Mammal"):

//Print the element in the 1st column of the ith row
print(data[i][0])

//increase the value of i by 1
i=i+1

(The program will basically iterate through the array , check if the first column is either A,E,C,D,E and the second column is Mammal. If found it will print that element and increment 1 by 1.)