#!/usr/bin/python3
def main():
	#containers
	tpl=(1,2,3,4)
	ml=[1,2,3,4]
	mdic={'key1':1, 'key2':2}
	#----gia tuple----
	print(tpl[0])
	for el in tpl:
		print(el)
	for i,el in enumerate(tpl): #to enumerate mas epistrefei zeugh timwn(thesh kai timh)
		print (f'[{i}]={el}')
	print(*tpl, sep=',') #dialegoume emeis to separator
	(a,b,_,_) =tpl #_: xarakthras agnohshs
	print(f'{a},{b},{a},{b}')
	#tpl[0]=4 apagoreuetai, gia na allaksoume mia timh prepei nai orisoume ena neo tpl

	#----gia lista----: shmantiko oi listes den einai pinakes giati den isxyei h praksh tou pollaplasiasmou
	for el in ml:
		print(el)
	for i,el in enumerate(ml):
		print(f'[{i}]={el}')
	print(el)
	ml[0]=3.4
	print(*ml)
	ml2=ml+ml
	print(*ml2)
	#----gia dictionary----
	for key,value in mdic.items():
		print (f'{key}={value}')
	for el in mdic.values():
		print(el)
	for key in mdic:
		print(key)

if __name__=="__main__":
	main()