Turtle 3D cubes

import turtle

screen=turtle.Screen()  

screen.setup(800,800)   

trtl = turtle.Turtle()

screen.title("3-D CUBES")

trtl.penup()

trtl.setposition(0,0)

trtl.setheading(90)

trtl.color('red')

def hexagon():

    for i in range(6):

        trtl.fd(50)

        trtl.rt(60)

i = 1

while i < 7:

    trtl.pendown()

    hexagon()

    trtl.right(60)

    i = i + 1 

Check if an URL is valid or not using Regular Expression

import re

def isValidURL(str):

regex = ("((http|https)://)(www.)?" +

"[a-zA-Z0-9@:%._\\+~#?&//=]" +

"{2,256}\\.[a-z]" +

"{2,6}\\b([-a-zA-Z0-9@:%" +

"._\\+~#?&//=]*)")

p = re.compile(regex)

if (str == None):

return False

if(re.search(p, str)):

return True

else:

return False

url = "https://www.pythonforengineers.in"

if(isValidURL(url) == True):

print("Yes")

else:

print("No")

Program to print double sided stair-case pattern

def pattern(n):

for i in range(1,n+1):

k =i + 1 if(i % 2 != 0) else i

for g in range(k,n):

if g>=k:

print(end=" ")

for j in range(0,k):

if j == k - 1:

print(" * ")

else:

print(" * ", end = " ")

n = 10

pattern(n)

Possible Words using given characters

def charCount(word):

dict = {}

for i in word:

dict[i] = dict.get(i, 0) + 1

return dict

def possible_words(lwords, charSet):

for word in lwords:

flag = 1

chars = charCount(word)

for key in chars:

if key not in charSet:

flag = 0

else:

if charSet.count(key) != chars[key]:

flag = 0

if flag == 1:

print(word)

if __name__ == "__main__":

input = ['goo', 'bat', 'me', 'eat', 'goal', 'boy', 'run']

charSet = ['e', 'o', 'b', 'a', 'm', 'g', 'l']

possible_words(input, charSet)

program to check the validity of a Password

import re

password = "D@m@_u0rtu9e$"

flag = 0

while True:

if (len(password)<8):

flag = -1

break

elif not re.search("[a-z]", password):

flag = -1

break

elif not re.search("[A-Z]", password):

flag = -1

break

elif not re.search("[0-9]", password):

flag = -1

break

elif not re.search("[_@$]", password):

flag = -1

break

elif re.search("\s", password):

flag = -1

break

else:

flag = 0

print("Valid Password")

break

if flag ==-1:

print("Not a Valid Password")