Python数据结构

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  1. Python手册： https://docs.python.org/3/reference/index.html#reference-index
  2. 数据结构：列表[]、元组()、集合{}、字典{k:v}

  3. 循环技巧：

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    # 列表循环技巧：
    for index, value in enumerate(['tic', 'tac', 'toe']):

    # 字典循环技巧：
    knights = {'gallahad': 'the pure', 'robin': 'the brave'}
    for key, value in knights.items():

    #列表打包
    questions = ['name', 'quest', 'favorite color']
    answers = ['lancelot', 'the holy grail', 'blue']
    for q, a in zip(questions, answers):
        print('What is your {0}?  It is {1}.'.format(q, a))

  4. 推导式

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    # 列表推导式
    squares = [x**2 for x in range(10)]
    mutiSquares = [[row[i] for row in matrix] for i in range(4)]    #嵌套的列表推导式

    # 集合推导式
    a = {x for x in 'abracadabra' if x not in 'abc'}
    # >>> {'r', 'd'}

    # 字典推导式
    a = {x: x**2 for x in (2, 4, 6)}
    # >>> {2: 4, 4: 16, 6: 36}

  5. 操作符：

  • not

  • and, or : 参数从左向右解析，一旦结果可以确定就停止

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    string1, string2, string3 = '', 'Trondheim', 'Hammer Dance'
    non_null = string1 or string2 or string3
    # non_null  -> 'Trondheim'

  • in, not in

  • is, is not