python3.x zip用法小结

class zip(object):
    """
    zip(*iterables) --> zip object
    
    Return a zip object whose .__next__() method returns a tuple where
    the i-th element comes from the i-th iterable argument.  The .__next__()
    method continues until the shortest iterable in the argument sequence
    is exhausted and then it raises StopIteration.
    """

def fun0():
    a = ['a', 'b', 'c', 'd']
    b = ['1', '2', '3', '4']
    result = zip(a, b)
    print(type(result))
    try:
        while True:
            print(next(result))
    except StopIteration:
        pass

def fun00():
    a = ['a', 'b', 'c', 'd']
    b = ['1', '2', '3', '4']
    result = zip(a, b)
    for ele in result:
        print(ele)

def fun0():
    a = ['a', 'b', 'c', 'd']
    b = ['1', '2', '3', '4', '5', '6']
    result = zip(a, b)
    try:
        while True:
            print(next(result))
    except StopIteration:
        pass

def fun5():
    names = ['lili', 'lucy', 'tracy', 'larry']
    scores = [98, 10, 75, 90]
    my_dict = dict(zip(names, scores))
    print(my_dict)

def fun3():
    names = ['lili', 'lucy', 'tracy', 'larry']
    scores = [98, 10, 75, 90]
    data = sorted(list(zip(names, scores)), key=lambda x: x[0], reverse=False)
    print(data)

def fun3():
    names = ['lili', 'lucy', 'tracy', 'larry']
    scores = [98, 10, 75, 90]
    data = sorted(list(zip(names, scores)), key=lambda x: x[1], reverse=True)
    print(data)

def fun4():
    sales = [10000, 9500, 9000]
    costs = [9000, 8000, 7000]
    allowances = [200, 100, 150]
    for sale, cost, allowance in zip(sales, costs, allowances):
        profit = sale - cost + allowance
        print(f"profit is: {profit}")

def fun4():
    sales = [10000, 9500, 9000]
    costs = [9000, 8000, 7000]
    allowances = [200, 100, 150]
    for sale, cost, allowance in zip(sales, costs, allowances):
        profit = sale - cost + allowance
        print(f"profit is: {profit}")

    for i in range(len(sales)):
        profit = sales[i] - costs[i] + allowances[i]
        print(f"profit is: {profit}")

def fun():
    a = ['a', 'b', 'c', 'd']
    b = ['1', '2', '3', '4']
    result = list(zip(a, b))
    print(result)
    zipobj = zip(a, b)
    a1, a2 = zip(*zipobj)
    print(list(a1))
    print(a2)