#this program shows how to work with strings

import random

def printString(my_string):
	#this function prints string char by char
	#each char on separate line
	
	for i in my_string:
		print(i)

def printString1(my_string):
        #this function prints string char by char
        #each char on separate line
	#this is a different solution

	for i in range(len(my_string)):
		print(my_string[i])


def randomString(size):
	#this function generates the string
	#using random numbers and conversion 
	#to character
	#function returns randomly generated string

	my_string=""
	for i in range(size):
		num=random.randint(33, 126)
		letter=chr(num)
		my_string=my_string+letter

	#could be written
	#my_string=my_string+chr(random.randint(33,126))	
	
	return my_string

def validPassword(my_string):
	#returns True if my_string has at least
	#one uppercase letter, at least one digit
	#and at least oen lowercase letter
	#otherwise returns False

	upper=False
	lower=False
	digit=False
	for i in my_string:
		if(i.isupper()):
			upper=True
		if(i.islower()):
			lower=True
		if(i.isdigit()):
			digit=True
	if(upper and lower and digit):
		return True
	else:
		return False 

 
def main():
	size=random.randint(7,20)
	print("size is ", size)
	name=randomString(size)
	print("random ", name)
	print("checking random name for password validity")
	if(validPassword(name)):
		print("random password valid")
	else:
		print("random password not valid")

	name=input("enter user password ")
	print("checking user password for validity ")
	if(validPassword(name)):
                print("user password valid")
        else:
                print("user password not valid")


main()