Patterns In Python

Introduction

This article shows how to draw different patterns in a Python console program.

 

Pattern 1

str=""
for i in range(1,6):
    for j in range(1,i+1):
        str=str+"*"
    str=str+"\n"

print(str)

Output

 

 

Pattern 2

str=""
for i in range(6,1,-1):
    for j in range(1,i):
        str=str+"*"
    str=str+"\n"
print(str)

Output

 

 

Pattern 3

str=""
for i in range(1,6):
    for space in range(1,6-i):
        str=str+" "
    for j in range(1,i+1):
        str=str+"*"
    str=str+"\n"
print(str)

Output

 

 

Pattern 4

str=""
for i in range(6,1,-1):
    for space in range(6-i,0,-1):
        str=str+" "
    for j in range(1,i):
        str=str+"*"
    str=str+"\n"
print(str)

Output

 

 

Pattern 5

rows=int(input("Enter the number of rows :"));
str=""
for i in range(1,rows+1):
    for space in range(1,rows+1-i):
        str=str+" "
    for j in range(0,2*i-1):
        str=str+"*"
    str=str+"\n"
print(str)

Output

 

 

Pattern 6

for i in range(rows,0,-1):
    for space in range(rows-i):
        str=str+"  "
    for j in range(i,2*i):
        str=str+"* "
    for k in range(0,i-1):
        str=str+"* "
    str=str+"\n"
print(str)

Output

 

 

Pattern 7: The following program prints Pascal Triangle.

import math
coef = 1
rows = int(input("Enter the number of rows :"))
stringVal = ""
for i in range(rows):
    for space in range(1,rows - i + 1):
        stringVal = stringVal + "  "
    for j in range(0,i + 1):
        if(i == 0 or j == 0):
            coef = 1
        else:
            coef = coef * (i - j + 1) / j

        temp = coef
        TotalSpace=0
        while(temp != 0):
            TotalSpace = TotalSpace + 1
            temp = int(math.floor(temp / 10))
        p=0
        while((p+TotalSpace)!=4):
            stringVal = stringVal + " "
            p=p+1
        stringVal = stringVal + str(int(math.floor(coef)))
    stringVal = stringVal + "\n"
print(stringVal)

Output:

 

 

Pattern 8: The following program prints floyd's triangle.

rows = int(input("Enter the number of rows :"))
stringVal = ""
k=0
for i in range(1,rows+1):
    for j in range(1,i+1):
        stringVal=stringVal+str(k+j)+" "
    k=k+1;
    stringVal=stringVal+"\n"
print(stringVal)

Output

 

 

Thanks!