python中创建列表、向列表中添加元素

>>> test1 = ["aaa","bbb","ccc"]
>>> type(test1)
<class 'list'>
>>> len(test1)
3
>>> test1.append("xxx")  ## 追加
>>> test1
['aaa', 'bbb', 'ccc', 'xxx']
>>> test1.append("yyy")
>>> test1
['aaa', 'bbb', 'ccc', 'xxx', 'yyy']
>>> test1.append("mmm","nnn")
Traceback (most recent call last):
  File "<pyshell#416>", line 1, in <module>
    test1.append("mmm","nnn")
TypeError: append() takes exactly one argument (2 given)
>>> test1.extend("mmm","nnn")
Traceback (most recent call last):
  File "<pyshell#417>", line 1, in <module>
    test1.extend("mmm","nnn")
TypeError: extend() takes exactly one argument (2 given)
>>> test1.extend(["mmm","nnn"])  ## 列表的扩展，添加多个元素
>>> test1
['aaa', 'bbb', 'ccc', 'xxx', 'yyy', 'mmm', 'nnn']
>>> test1.insert(0,111)  ## 列表插入
>>> test1
[111, 'aaa', 'bbb', 'ccc', 'xxx', 'yyy', 'mmm', 'nnn']
>>> test1.insert(1,222)
>>> test1
[111, 222, 'aaa', 'bbb', 'ccc', 'xxx', 'yyy', 'mmm', 'nnn']
>>> test1.insert(5,3333)
>>> test1
[111, 222, 'aaa', 'bbb', 'ccc', 3333, 'xxx', 'yyy', 'mmm', 'nnn']
>>> test1.insert(-1,888)
>>> test1
[111, 222, 'aaa', 'bbb', 'ccc', 3333, 'xxx', 'yyy', 'mmm', 888, 'nnn']

>>> test1 = ["aaa","bbb","ccc"]
>>> test2 = ["mmm",111,333]
>>> test1 + test2
['aaa', 'bbb', 'ccc', 'mmm', 111, 333]
>>> test2 + test1
['mmm', 111, 333, 'aaa', 'bbb', 'ccc']