//...1...
def a():
    list=[]
    for i in range(1000):
        list=list+[i]
    print(list)

//...2...
def b():
    list=[]
    for i in range(1000):
        list+=[i]
    print(list)

//...3...
def c():
    list=[]
    for i in range(1000):
        list.append([i])
    print(list)

//...4...
def d():
    list=[i for i in range(1000)]
    print(list)


//...5...
def e():
    list(range(1000))
    print(list)