http://jetbrains.com/help/pycharm/symbols.html#common-icons

    Icon Description
    pycharm图标 - 图1 Python script
    pycharm图标 - 图2 Class
    pycharm图标 - 图3 Method
    pycharm图标 - 图4 Function
    pycharm图标 - 图5 Field
    pycharm图标 - 图6 Variable
    pycharm图标 - 图7 Property
    pycharm图标 - 图8 Parameter
    pycharm图标 - 图9 Element
    Project structure
    pycharm图标 - 图10 Directory
    pycharm图标 - 图11 Package
    pycharm图标 - 图12 Source root
    pycharm图标 - 图13 Excluded root
    pycharm图标 - 图14 Template roots
    Visibility modifiers
    pycharm图标 - 图15 private
    pycharm图标 - 图16 protected
    pycharm图标 - 图17 public
    pycharm图标 - 图18 The lock decorator in the upper-left part of a symbol marks a symbol whose name begins with one or more underscores. Such names are considered pseudo-private and are specially treated by an interpreter to restrict their visibility scope. 符号左上角的锁装饰符标记
    名称以一个或多个下划线开头的符号。
    此类名称被视为伪私有名称，
    并由解释器进行特殊处理
    以限制其可见性范围。
    pycharm图标 - 图19 The blue bubble in the upper-left part of a symbol marks a symbol whose name begins and ends with two underscores, and is specially treated by an interpreter and standard library
    .