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Python Pattern Programs - Printing Stars '*' in Right Angle Triangle Shape | Star Pattern - YouTube
Channel: Amulya's Academy
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Hello guys and welcome to Python programming
tutorials by Amuls Academy.
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Today in this tutorial we will discuss about
a pattern program, that is we need our output
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in this pattern that is a single star in first
line, two star in the second line, 3 star
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in the third line, 4 star in 4th line etc.
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So we'll see how to write a program to get
output like this.
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Before going to the program we will see what
are the requirements of the program, that
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is first input that is we will ask the user
to enter the input that is how many rows he
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want.
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We can see this pattern contains 5 rows but
in our program we will ask the user to enter
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the number of rows.
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Second one is for loop, for this program we
need two for loops that is we can see here
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rows and columns.
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So for row we need one for loop, for columns
we need another for loop, so we need two for
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loop.
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And third is range function in our program
we are using range function we already discussed
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about the range function in our tutorial and
again I'll explain you.
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And in the range function we will use key
as ‘range’ and it takes two arguments
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one is start and one is end and range function
is used to print the continuous number that
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is if I want zero to 10 numbers, then I can
mention here that is zero and i need to mention
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11 here it's because here zero is included
here, and 11 is excluded.
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That is if I want integer from zero to 10,
then i need to mention zero and 11 here.
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Ok if you want to see this i will use for
loop int range 0 to 11.
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And here we can see if I want 0 to 10 numbers
then I need to mention 0 and 11 here and to
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print continuous numbers we will use range
function.
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And next last is print function that is, if
you type help and print and this is the syntax
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of print function and here we can see end
is ‘\n’.
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That is if i use print function here, and
I'll write ‘hello’ and I'll separate this,
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next i will write next line that is print
“hi” ok.
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Now i will enter.
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We can see “hello” and “hi” in different
lines.
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Once it will write this “hello” message
to the screen as we see in the print syntax
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end is equal to “\n” and we didn't mention
Anything here so by default it will go to
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the next line and it will print the next message
and here print “hello”, and I'll change
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this end to space i will separate this and
I will use print “hi” ok.
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Now I will enter this, we can see “hello”
and “hi” in the same line and it is separated
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by a space.
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it's because we use end as space here ok.
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Now we'll go to our pattern program and first,
we need to ask the user to enter the input.
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So I'll use one variable called “num”
, and I will ask the user to enter the number
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of rows and it is an integer value, so I'll
use int, input function “enter the number
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of rows” ok, now I will use for loop.
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It is first for loop for rows, so for i in
range function and i will take the value from
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1, so 1 to num+1.
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As i said in the range function, it is included
and this values excluded.
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if the user entered the value 5, then we want
value 1 to 5, so i mention num+ 1, so it is
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6 now so it will give the value 1 to 5.
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And here within the for function, I'll use
another for and j in range here also I'll
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use 1 and i+1 ok.
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Now i will print, i want to print star”*”
right, so i will print star and here, I will
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mention end is equal to space ok.
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Now I will go out of this for loop, and in
the first for loop I'll write a print function
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and now I will save this and run this, now
enter the number of rows i will enter 5, and
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here we can see 1 2 3 4 and 5 right ok.
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First here we will ask the user to enter the
number of rows, so we entered 5 here, so value
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of num is 5 ok, and coming to the for loop
range 1 to num+1 so range value is 1 and 6
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ok.
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So it will give 1 2 3 4 and 5 ok.
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Now first i value is 1 here.
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Next it will go to the j th loop and here
it's range is 1 to i+1.
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So now here range is 1 to i+1 that is, 2 so
it will give 1.
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j value is 1 here.
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So it will go to the print statement and it
will print the star and it will take end as
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space and again it will go to the for loop.
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But here in the range function, it will give
only one value that is 1 so it is already
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executed so it will come out of this loop,
and it will execute this print statement that
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is it will give new line.
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So we got first star and the control goes
to the next line now.
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Next here again it will go to the for loop
and now i value is 2.
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so i value is 2 now.
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And again it will go to the for loop, because
of the i value is 2, here it is 1 to i+1.
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That is 1 to 3 , 1 and 3 .
so it will give value 1 and 2.
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now again j value is 1, and it will print
this star that is this star, and next it will
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print this space.
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Again it will go to this loop and now j value
will be incremented to 2 and it will go to
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this print statement and it will print this
star okay.
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After this here range function gives only
two value so, after this it will come out
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of this loop and it will print this, so it
will go to the next line.
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Like this it will continue the execution and
it will print this Pattern.
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ok that's it for now thank you for watching
don't forget to subscribe my channel I'll
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meet you next class till then take care .
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