Hello Guys and welcome to Python programming
tutorials by amul's Academy. So today in this tutorial we are discussing
about a pattern program that is we want to print stars in this shape that is heart shape
ok so there are different ways to write a program so today here we will discuss one
way to write the program to print stars in the heart shape. if you have any other ideas or way to write
this program then don't forget to comment below. Alright so let's get started with the today's
program, so we want to print stars in the heart shape the first thing we need to do
is, we need to write down the output with rows and column. We can see these are the rows here 0th row
1 2 3 4 and 5 ok. and these are the columns 0 1 2 3 4 5 and
6. So in my output there are 6 rows and 7 columns. So in our program first we'll take two for
loops because we want to print stars in different row and column so for that we need two for
loop so we'll use nested for loop here, for loop within the for loop. Like previous pattern programs, first we will
write the for loop for row, inside that we will write the for loop for column. ok so in the Python file first i need to write
the for loop for row, So here first i will write for loop for row,
here i'll take my variable name as ‘row’ if you want you can change the variable name
“in” and i'll use range function here and inside the range i need to mention how
many rows i want in my output, we want 6 rows right we saw in the output we want 6 rows. Here it will start from zero so 0 1 2 3 4
5 ok so total 6 rows. so here i'll mention my range as 0 to 6 ok
so that means it will give output as 0 1 2 3 4 5 that's what i want in my output right. Next inside this i'll take another for loop
that is for column alright here “col” is my variable name and here also i am using
range function and here inside the range function i need to mention how many columns i want
in my output, i want 7 columns right, here we can see 0 1 2 3 4 5 6 that means total
7 columns. so here i took range as 7, so it will give
output as 0 1 2 3 4 5 and 6. Inside this for loop body i will take if else
conditional statement that is because here i want to print stars in the heart shape so
for that we need condition that's why we use if else conditional statement and here i'll
mention “if” keyword after that i need to mention in which row and column i want
to print star ok. So here i need to mention that , for that
we need to see the output so first what i'll do is, i will divide my output into different
parts so that it will be easy to write the condition ok so this is my first part okay
that is row 0, next this row 1 ok. This is my second part , so here this is my
third part and this is my 4th part ok. so i will divide my output in four parts ok. So here first we'll see this stars ok we want
to print star at row zero and column 1, column 2, column 4, column 5. row and column, at row 0 i want start at column
1, column 2, column 4 and column 5 right. i want star in these columns so i don't want
star at 0, 3 and 6. Here observe this if i divide this column
value by 3 we will get the reminder as zero. That’s nothing but if i divide “zero modulus
3”, ok if i check the reminder of this, it will 0. “3 modulus 3”,so it is 0. “6 modulus 3”, it is 0 right. And here we can see, this 0 3 and 6 are the
column values right so here first i will write my condition as when “row is equal to zero
and column modulus 3 is not equal to zero”, i want to print star. so ok so this is my first condition that is
when “row is equal to equal to zero and column modulus 3 is not equal to zero”,
that is nothing but ok so it will check for the first condition that is this. Row 0 column 0, ok so row is equal to zero,
so it will go to the “and” condition and it will check this condition,
Whether “column modulus 3” is equal to 0 or not. Here column value is 0, so so it will check,
it is equal to zero right. so this condition will become false, so it
won't print star here. In the next position here we can see row 0
column 1 right so here it will check, whether “row is equal to zero”,yes and
it will come to the next condition, so here column value is 1, so “1 modulus
3” whether it is equal to zero, no it is not right so it is equal to one, so it will
print this star at the output okay . Here we can see at row 0, we don't want star
at column 0, column 3 and column 6. That's why here we mention the condition like
this ok, so this is my first condition. Here i will check when “row is equal to
equal to zero and column modulus 3 is not equal to zero” columns i want star ok this
is my first condition. Here we used logical “and”, because to
print star both these condition need to be true here OK so the first condition is when
“row is equal to zero”, i want star at column 1, 2 and 4, 5 i don't want star at
column zero, column 3 and columns 6. That's why here we wrote the condition like
this ok so we are done with the first part. So next we will move to the next condition,
that is row 1. At row 1 we want star at column 0, column
3 column 6. It is the exact opposite of row 0 right?,
At row 0 we don't want star at column 0, column 3, column 6 .
But in row 1, we want star at only column 0 ,column 3 and column 6 that's why i will
write the condition like this, or when “row is equal to equal to one column modulus 3
is equal to equal to zero”. Because here we want star at 0,3 and 6 right,
that's why here “equal to equal to zero” when it is true i want to print star. At row 0 i don't want star at 0, 3, 6 that's
why here i mention “not equal to” ok and here “or” is the logical or operator and
in the case of logical or operator if any one of this condition is true it will print
star ok that's why here we took or operator here. So next we will move on to the next condition,
so next we want to print star here. So to print star here, we will subtract row
and column values. Here we can write this as row and column ok
so here we can see this star is at Row 2 and column 0. This is at row 3 and column 1. This is at row 4 and column 2.
and this is at row 5 and column 3 right. So now what i'll do is, to print these 4 stars
i will subtract column value from row. if i do row minus column, here to “2-0”
so we'll get 2. “3 - 1”, 2
“4 - 2”, 2 “5 - 3”, 2 ok.
so in the case of these 4 stars, if you subtract column value from row, then we'll get the
result as 2. So i will write my condition like this when
“row minus column is equal to equal to two”, i want to print star ok so my next condition
will be i will check “row minus column is equal to equal to 2”, ok so this is my third
condition so to print these four Stars. Next ok so next to we want to print these
3 stars right. So first we will write the position of the
stars that is row and column value. So this star is at row 2 and column 6,
So i will write row 2 column 6. Next this star is at row 3 column 5. This star is at row 4 and column 4. OK so next to print these stars what i'll
do is, i'll add this row and column value. So if i add this, we can see 8,
“3 + 5”, 8 “4 + 5”, 8. so if i add row plus column value, it will
give same output that is 8. so to print these three stars i will write
my condition like this when “row + column is equal to equal to 8”, i want to print
star. So it will print these three stars. So my next condition will be or “row+column
is equal to equal to 8” colon here inside this body if any one of this condition is
true i want to print star so star, end is equal to empty string. here “end is equal to empty string” is
nothing but after printing one star i want control to be in the same line that's why
here i took “end is equal to empty string”, by default in print function end value will
be “\n” that is after printing star it will go to the next line. But here we don't want that that's why here
we took “end is equal to empty string”, and here this is my first condition, this
is my second condition, this is my third condition and next is the fourth condition. Here we used logical or between this condition
so if any one of this condition is true it will print star ok. So next we will go to the else part, if that
condition is not true ok, then i want to print space in that place ok so space “end is
equal to empty string”, if that condition is not true i want to print space and here
also i want to keep the control in the same line that that's why here i used “end is
equal to empty string” ok here we can see in this places we want space that's why we
wrote the else part ok and here we can see after printing one star i want next star immediately
after that right so that's why we use “end is equal to empty string”. Here you can write like this ” space , end
is equal to empty string” or you can write end,
both are same ok . Next here inside the first for loop i will
use print function, so this is inside the first for loop. This print function is for new line that is
after printing stars in one row we want to go to the next line. Here we can see after printing row 0 we want
next row in the new line right that's why here we used this print function. So we are done with our code so we need to
save this and and run this. and here we can see stars in the heart shape
ok so here we wrote our program in the Python 3.5 but if you're using Python 2 and you want
to run this code then you need to do few changes in the code. That is so if you are using python 2 then
you need to write the code like this, till here it is same ok condition all are same
here you just need to concentrate on print OK. Here print is not a function so you need to
write like this and we can't use end here instead of that we can use comma at the end
of this statement right. So if i save this and run this here we can
see stars in heart shape ok so that's it for now thank you for watching don't forget to
subscribe to my channel i'll meet you in next class till then take care.
