#!/usr/bin/python3
#List comprehensions
def main():
	e=[x for x in range(20)]
	print (e)
	e=[x for x in range(20) if x&2==0]
	w=["hello","from","python"]
	uw=[x.upper() for x in w]
	a=[[1,2],[3,4],[5,6]]
	print(a[0])
	print(a[0][0])
	for row in a:
		print(f"{row}")
	print ("-print ana col-")
	for row in a:
		for el in row:
			print (f"{el}\t", end="")
		print(" ")
	for i,_ in enumerate(a):
		for j,_ in enumerate(a[i]):
			print (f"{a[i][j]}\t", end="")
		print(" ")	
	#f=[x for x in row for num in a]


if __name__=="__main__":
	main()