[已解决]extend 追加多个元素，打印none

wideband

split、rsplit、partition和rpartition的用法

text = "Hello, how are you?"
result = text.split(",")  # 使用逗号作为分隔符进行分割
print(result)

——————['Hello', ' how are you?']

text = "I love apples and oranges and bananas"
result = text.rsplit("and", 2)  # 使用"and"作为分隔符进行分割，最多分割两次
print(result)

——['I love apples ', ' oranges ', ' bananas']

text = "I have a cat"
result = text.partition("have")
print(result)

——('I ', 'have', ' a cat')

text = "I have a cat"
result = text.rpartition("a")
print(result)

——('I have ', 'a', ' cat')

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('I have a c', 'a', 't')

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前面描述的 嵌套字典 中关键字排序：

for id, person in sorted(people.items(), key=lambda x: x[1]['age']):
    print....

x 就是外部字典 中的每个字典；
x[1] 就是里面字典；
x[1]['age']： 人员信息的 具体一个值；

wideband

阐述以下方法:
@classmethod
@staticmethod
@property

wideband

画出三角形ABC，边长分别是 a,b,c

import turtle

# 设置顶点坐标和边长
A = (-100, 0)
B = (100, 0)
C = (0, 150)
a = 200
b = 150
c = 130

# 移动到点A
turtle.penup()
turtle.goto(A)
turtle.pendown()

# 显示顶点A
turtle.write("A", align="right")

# 画出三角形
turtle.goto(B)
turtle.write("B", align="left")
turtle.goto(C)
turtle.write("C", align="center")
turtle.goto(A)

'''
# 显示边长
turtle.penup()
turtle.goto((A[0]+B[0])/2, (A[1]+B[1])/2)
turtle.write("a", align="right")
turtle.goto((B[0]+C[0])/2, (B[1]+C[1])/2)
turtle.write("b", align="right")
turtle.goto((A[0]+C[0])/2, (A[1]+C[1])/2)
turtle.write("c", align="right")

# 隐藏海龟
turtle.hideturtle()
turtle.done()

'''