Multiplication table with Python

first_doc = '''it created by iliya zahedi abghari

i am the student in iran , alameh tabatabayi school
'''

print(first_doc)
def jadval_zarb(rows, columns):
	for i in range(1,rows+1):
		for j in range(1,columns+1):
			#print(i*j, end=' ')
			print('{:>4}'.format(i* j), end=' ')
		print()
jadval_zarb(10,10)
def do_continue():
	choice = str(input('continue(yes/no)?')).lower()
	if(choice !='yes'):
		return False
	return True
while True:
	rows = int(input("Enter rows:"))
	columns = int(input("Enter columns:"))
	jadval_zarb(rows, columns)
	if(not do_continue()):
		break