Lists vs. iterators

gistfile1.py

def do_work(i):
    # do something very time-consuming here
    print("computing stuff for i =", i)
    return i < 2

# Test with lists
print( all( [ do_work(i) for i in range(6) ] ) )
    # computing stuff for i = 0
    # computing stuff for i = 1
    # computing stuff for i = 2
    # computing stuff for i = 3
    # computing stuff for i = 4
    # computing stuff for i = 5
    # False
    
# Test with iterator
print( all( do_work(i) for i in range(6) ) )
    # computing stuff for i = 0
    # computing stuff for i = 1
    # computing stuff for i = 2
    # False