Python “为什么？”；“从文件导入类工作”中；，而不是",；导入文件"；？

我在一个文件中创建了一个类，如下所示：

class Robot():

    def __init__(self, name, desc, color, owner):
    # initializes our robot

        self.name = name
        self.desc = desc
        self.color = color
        self.owner = owner

    def drive_forward(self):
    #simulates driving forward
    print(self.name.title() + " is driving" + " forward " + str(self.duration)+ " milliseconds")

    def drive_backwards(self):
    print(self.name.title() + " is driving" + " backwards " + str(self.duration) + " milliseconds")

    def turn_left(self):
    print(self.name.title() + " is turning " + " left " + str(self.duration) + " milliseconds")

    def turn_right(self):
    print(self.name.title() + " is turning " + " right " + str(self.duration)  + " milliseconds")

from robot_sample_class  import Robot

my_robot = Robot("Nomad", "Autonomous rover", "Black", "JAY")

print("My robot is a " + my_robot.desc + " called " + my_robot.name)

my_robot.drive_forward()
my_robot.drive_backwards()
my_robot.turn_left()
my_robot.turn_right()

我正试图将这个文件导入到另一个文件，这样我就可以 实例化它，看看OOP是如何工作的

我试图导入类并实例化的另一个文件如下所示：

class Robot():

    def __init__(self, name, desc, color, owner):
    # initializes our robot

        self.name = name
        self.desc = desc
        self.color = color
        self.owner = owner

    def drive_forward(self):
    #simulates driving forward
    print(self.name.title() + " is driving" + " forward " + str(self.duration)+ " milliseconds")

    def drive_backwards(self):
    print(self.name.title() + " is driving" + " backwards " + str(self.duration) + " milliseconds")

    def turn_left(self):
    print(self.name.title() + " is turning " + " left " + str(self.duration) + " milliseconds")

    def turn_right(self):
    print(self.name.title() + " is turning " + " right " + str(self.duration)  + " milliseconds")

from robot_sample_class  import Robot

my_robot = Robot("Nomad", "Autonomous rover", "Black", "JAY")

print("My robot is a " + my_robot.desc + " called " + my_robot.name)

my_robot.drive_forward()
my_robot.drive_backwards()
my_robot.turn_left()
my_robot.turn_right()

这段代码在pythonshell上运行良好；然而，如果我只是写

单独导入“robot\u sample\u class”，而不是“从robot\u sample\u class导入robot”

它不工作，并会弹出一条错误消息，如：

my_robot=机器人（“游牧民”、“自主漫游者”、“黑色”、“杰伊”） NameError:未定义名称“Robot”

为什么会这样？我想导入整个文件将允许我 访问该文件中的所有内容

import robot_sample_class

意味着你需要写：

robot_sample_class.Robot(...)

如果要将所有内容导入全局命名空间，请使用：

from robot_sample_class import *

虽然这不建议用于持久的代码

意味着你需要写：

robot_sample_class.Robot(...)

如果要将所有内容导入全局命名空间，请使用：

from robot_sample_class import *

虽然这不建议用于持久的代码