Python3-筆記-C-003-函數-enumerate

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def testenumerate():
    # enumerate(iterable, start=0)
    # enumerate將iterable組成一個索引序列，利用它可以同時獲得索引和值
    # 多用於在for迴圈中得到計數

    l = [‘a‘, ‘b‘, ‘c‘] # <class ‘list‘>: [‘a‘, ‘b‘, ‘c‘]
    l1 = list(enumerate(l)) # <class ‘list‘>: [(0, ‘a‘), (1, ‘b‘), (2, ‘c‘)]
    t = (‘快樂‘, ‘高興‘, ‘開心‘) # <class ‘tuple‘>: (‘快樂‘, ‘高興‘, ‘開心‘)
    l1 = list(enumerate(t)) # <class ‘list‘>: [(0, ‘快樂‘), (1, ‘高興‘), (2, ‘開心‘)]
    d = {‘深圳‘: 1, ‘廣州‘: 2, ‘珠海‘: 3}
    l1 = list(enumerate(d, 2)) # <class ‘list‘>: [(2, ‘深圳‘), (3, ‘廣州‘), (4, ‘珠海‘)]
    s = ‘深圳1800萬人‘
    l1 = list(enumerate(s, 1)) # <class ‘list‘>: [(1, ‘深‘), (2, ‘圳‘), (3, ‘1‘), (4, ‘8‘), (5, ‘0‘), (6, ‘0‘), (7, ‘萬‘), (8, ‘人‘)]

    # 遍曆
    list1 = ["這", "是", "一個", "測試"]
    for index, item in enumerate(list1, 1):
        print(index, item)
        # 1 這
        # 2 是
        # 3 一個
        # 4 測試

    # 統計檔案的行數
    count = 0
    for index, line in enumerate(open("file.txt", ‘r‘)):
        count += 1
    print(count)

Python3-筆記-C-003-函數-enumerate