Solve any Star Pattern program in Python
Solve any Star Pattern program in Python
In this video we will learn how to write any star pattern program in Python
Watch any number pattern in python - • Solve any Number Pattern program in P…
00:00 - Introduction
03:13 - Simple square star pattern in python
07:12 - Increasing triangle star pattern in python
08:51 - Decreasing triangle star pattern in python
10:15 - Different type of patterns in python
11:21 - Right sided triangle star pattern in python
14:11 - Right sided downward triangle star pattern in python
15:00 - Hill star pattern in python
16:01 - Reverse hill pattern in python
16:39 - Diamond star pattern in python
For Notes on How to solve any star patterns in python click on - https://simplycoding.in/star-pattern-…
Content
0.4 -> hello in this video we will learn how to
solve any star pattern program in python
7.2 -> when you search the internet you might have
come across many videos playlists or lengthy
13.2 -> blogs explaining different pattern programs so
do you need to learn each of them answer is no
20.64 -> what you need is to understand the basics and
learn the tricks so that you can answer any random
27.04 -> pattern question which is given to you now if you
go through this video you will be able to make any
34 -> of these patterns shown and i will explain to you
how now you might have played with blocks when you
41.28 -> were a kid you could create any kind of shapes and
design from a simple block we are going to use the
49.44 -> same method here what we are going to learn is two
basic blocks how to make an increasing triangle
57.52 -> and a decreasing triangle using just these two we
will teach you how to join them together to make
64.56 -> any kind of pattern that is asked so a complex
pattern is nothing but these two basic triangles
72 -> either filled with star hash or dollar an
important point you need to know before you start
79.68 -> is that when we print we do it row by row you
always start printing from left side of the screen
88.16 -> if your star is printed away from the left side
of the screen or there is space in between the
94.32 -> stars like in these two hills then you do not jump
and print this is actually done by printing spaces
103.12 -> so in this line there are four spaces printed
first then one star and then again seven spaces
111.04 -> and then one star and so on for all
remaining rows we cannot go back to
117.52 -> previous row you have to print this entire row
and then move to next row so let's get started
126.16 -> the first thing in pattern is the size size means
how big or how many rows you want in the triangle
134.56 -> now either you could be asked to take size from
the user and you can use input function to take in
141.52 -> the size or if you are asked to write a function
this n could be passed to you as a parameter if
148.96 -> you are given size in the question itself in that
case you can just directly assign it to a variable
156.08 -> n for our examples we will consider that we have
size in variable n which has value 5. also in the
165.12 -> remaining video we will just focus on code to make
the pattern depending upon your question you can
172.4 -> either write a function or take input from user
and just plug this code in first let's start by
180 -> basics pattern program requires you to use loops
if you do not know basics of loops in python
188 -> please watch my video on iterations first let's
start with a simple square as an example first
195.92 -> now if you are asked to print one star you will
write a print statement which will print a star
202.32 -> for you now if you are asked to print n stars
what will we do there are two ways you can do it
209.76 -> one is just use multiplication in print statement
and you can get n stars or we can use a loop
218 -> in this method we use the range function along
with for loop if we give range n then the loop
226.08 -> will run from 0 to less than n means i will have
values from 0 to 4 but if we run this code we see
235.44 -> it prints each star in a new line but we want it
in one line so we will add end is equal to blank
243.84 -> and it will override the new line and print stars
in the same line this loop will run five times and
251.68 -> print the star five times so we have written
this code with which we can print one row but
259.12 -> what we want is to print this row five times
to get our square pattern so what i will do is
266.8 -> insert this complete set of code inside another
loop which will print this row five times
274.24 -> if you run this you will see that all
stars are getting printed on the same row
280 -> how do we fix this we know our print statement
with end is equal to blank is making it print
287.04 -> in the same row so can we just remove it
from the print star statement to fix it
293.2 -> if we do that then what happens is
now each star is going to next line
298.64 -> what we want is 5 stars in the same row and then
it should go to next line means this loop will
306.32 -> continue to have print statement with end is equal
to blank and only after this whole row is printed
314.32 -> we go to next line so we will insert a print
statement as the last statement of the outer loop
322.4 -> so let's just understand how the loop will work we
start with the outer loop it holds our row numbers
330.24 -> and starts with 0 then we enter the inner loop
it holds our column numbers and starts with 0
338.48 -> and runs till less than n which is 4 to print
all the columns once inner loop is finished
346.16 -> the control comes back to the outer loop and
outer loop increments by 1 so we go to next row
354 -> and again in a loop prints 5 columns as
it will again start from 0 to less than
360.16 -> n this repeats for all rows till i is less
than n and then we exit from the outer loop
368.48 -> a key takeaway from this is do not forget to put
print statement before exiting the outer loop
376.64 -> this is a very important point and if you miss
writing print statement as the last statement
383.12 -> your whole pattern can go for a toss now if i run
this you will see our output has stars to close
391.2 -> and it is giving an effect of rectangle instead
of square you can fix this by just adding an extra
398.56 -> space using the end parameter what we will do is
instead of blank we will put a single space in
406.4 -> the end parameter which will ensure that there is
a space after every start so this is a final code
414.4 -> to print a square let's go back to the print
statement we are printing star here this could
422.32 -> actually be anything if you print hash it will
be a pattern of hash a dollar then it will be
429.04 -> a pattern of dollar and so on now let's learn
our first basic pattern of increasing triangle
437.28 -> let's take a previous program which printed a
square we will just edit this to print triangle
445.28 -> we know now that the outer loop determines the
rows and inner loop determines the columns we
452.32 -> see that in this pattern the rows are 5 or
n only so our outer loop is correct already
460.08 -> and requires no change and it is already printing
n rows coming to columns instead of printing
467.84 -> 5 stars or printing from 0 to 4 it should print
1 star for 0 through 2 star for first row 3 star
476.96 -> for second row and so on point to note here is
that for each row i need row number plus 1 stars
486.64 -> row number is stored in variable i which
is starting from 0 and incrementing to 1 2
493.68 -> 3 till all rows are printed so what we will just
change here is set inner loop to run to i plus 1.
502.96 -> this will ensure inner loop runs for only
one time in the first row two time in the
508.72 -> second row then three then four and then n this
completes our program for increasing triangle
516.48 -> important point to remember in this is that for
making an increasing triangle outer loop is set to
523.68 -> n and nested loop is set to i plus 1
remaining program is exactly the same
531.2 -> now let's learn second basic pattern
decreasing triangle we will again take
536.96 -> our square program we will just edit this to
print decreasing triangle if you see this code
544.64 -> outer loop is correct already and requires no
change as it is already printing n rows from
552.08 -> 0 to less than n but now we need the columns to
print decreasing number of stars 5 4 3 2 and 1.
562.8 -> how do we change our nested for loop to reduce
by 1 every time this time we will add a start
570.24 -> condition we will use i as the start condition
so for first row the loop will run from 0 to 5
578.8 -> printing 5 stars second row it will run from 1
to 5 that means 4 times and then 3 2 and 1 star
588.64 -> this completes our program for decreasing
triangle so important point to remember in
594.96 -> making decreasing triangle pattern is that outer
loop is still n and nested loop is from i to n
603.84 -> now you have the basic ammunition in place if
you do not understand these two basic triangles
610.8 -> go back rewind and understand it again let's take
a look at some of the patterns we saw earlier
618.96 -> all of the patterns you see here are made from
combination of these two type of triangles as
626.16 -> you know we always start printing from left side
of the screen so where we see blank is actually
633.52 -> the same triangle pattern made with spaces
so this pattern is made up of two triangles
640.16 -> one increasing pattern of space and one
decreasing pattern of star this pattern also
647.44 -> has two triangles it has one decreasing pattern of
space followed by one increasing pattern of star
655.92 -> this pattern has three triangles first
it has one decreasing pattern of space
662 -> followed by one increasing pattern of star and
one more increasing pattern of star also do
669.68 -> note in all of these here the rows are n only but
columns have different printing options space or
678.32 -> star so let's try to solve it let's pick up this
pattern first now this pattern has two triangles
687.44 -> first is decreasing triangle printing space and
second is increasing triangle printing stars
695.44 -> do note that on same row we have to now print
space and star let's write the program for it
703.84 -> since our number of rows are same as that of
square pattern we will first copy the outer
710.24 -> loop from our previous program and it runs till
n to note our empty print line which takes us to
718.08 -> new row every time sticks to the end of the outer
loop you should not forget it or try to link it
725.6 -> with any nested loop ever first we have decreasing
triangle of space so we recall our code of nested
734.32 -> loop for decreasing triangle and we will write
our nested for loop for decreasing triangle from
741.44 -> i to n here the print statement will print space
only now the next triangle is increasing triangle
750 -> pattern printing stars in the same row so
we will just add another nested for loop
756.88 -> for increasing triangle pattern and we know this
will run till i plus one this will print star
765.2 -> let's take a look at how this will work for the
first row when i is zero first the upper nested
772.48 -> loop will execute and print 5 spaces then in the
same row it will enter the second nested loop and
781.44 -> will print 1 star then it will go to next row and
i will become one then it will print four space
790.4 -> from the first nested loop and then two star from
the second nested loop so these two nested loops
797.68 -> are working one after the other to print all
columns we need in a row this will go on till
805.6 -> the entire pattern is printed now this is the
program for this pattern you need to remember two
813.76 -> important things here first empty print statement
is linked to rows or outer loop we do not repeat
822.72 -> it with every inner loop second each print has
got either a space or a character followed by
832.08 -> a space which is part of the end that means two
characters are printed in each print statement
839.6 -> all of your print statement need to have the same
number of characters even if it is printing space
848.4 -> now let's see another pattern what if the pattern
was like this it is increasing triangle of space
856.24 -> and then decreasing triangle of star since our
number of rows are same as that of square pattern
864 -> we will first copy the same outer loop from the
previous program and it runs till n since first
871.68 -> loop is increasing triangle we will write our
nested for loop for increasing triangle till i
878.48 -> plus 1. here the print statement will print space
only now the next triangle is decreasing triangle
886.8 -> so we will just add another nested for loop for
decreasing triangle pattern which will run from
893.36 -> i to n this will print start this
is the final code for this pattern
899.76 -> now what if pattern was like this a hill
pattern now we already have written code for
905.92 -> first two triangle of this pattern here the third
triangle is also an increasing triangle pattern
913.44 -> so we will write one more nested loop now there
is a small catch here which you need to remember
920.64 -> let's run this and see here when you see the
output you see it does not have a peak why
928.16 -> because our loop knows how to make 5 columns each
in such pattern actually there is one less column
936.16 -> printed we need to make one of the nested loop
print one less column so to make this nested loop
944.48 -> run one less we will just change the for condition
of first increasing triangle from range i plus 1
952.88 -> to range i this will make the loop print one less
column so this is a final code for this pattern
962 -> now what if it was reverse mountain pattern
here there is one decreasing triangle and two
968.4 -> increasing triangle now we already have written
code for first two triangle of this pattern
975.6 -> like in previous question we will just add a
third nested loop for increasing triangle and to
983.04 -> make sure we have our valley correct we will have
nested loop print 1 less column so we will change
990.96 -> n to n minus 1 in range function this
is our code for reverse mountain pattern
999.28 -> let's take a look at patterns which double up
on rows as well let's take this diamond pattern
1006.48 -> here you have to print pattern below another
pattern now we have the code for hill pattern
1013.2 -> and inverted hill pattern 2. here note that the
rows are also doubling up so what you need to
1020.08 -> do is just place two code one below the other
along with the outer loop so you run one outer
1028.24 -> loop along with its nested loop for rows of upper
set of triangles and run another outer loop along
1036.48 -> with its nested loop for rows for lower set of
triangles let's run this to see by just doing this
1044.16 -> do we get the desired pattern this is close
but this too has one issue that it does not
1050.88 -> have pointed corners looking closely we
see actually our rows two don't double up
1057.28 -> there is one less row to give us pointed edges
the solution is similar to what we did for columns
1065.04 -> we need to print one less row how do we do that
we just reduce the condition of outer for loop
1072.88 -> to print one less row effectively deleting its
last row so we will just change our outer loop
1080 -> condition from range n to range n minus 1.
now this is our required program for diamond
1088.56 -> now you can try any different pattern like
this shown using the same logic break it into
1095.36 -> increasing and decreasing triangles and then just
bundle up the code hope you have understood how to
1102.48 -> solve the pattern problems in our next video
we will cover how to solve any of the number
1108.96 -> patterns if you have any doubts do reach out
to us at simplycoding.in thank you and goodbye
Source: https://www.youtube.com/watch?v=fX64q6sYom0