python array

Python array 1, common exercises:

Test questions:

0. What kind of things can be stored in a list?

Answer: Integers, floating point numbers, strings, objects, any data type can be stored

1. What are the ways to add elements to a list?

Answer: append() and extend() and insert()

2. The append() method and the extend() method are like adding elements to the end of the list. What is the difference between them?

Answer: append(): Add the parameter as an element to the end of the list

extend(): Use the parameter as a list to extend the end of the list

3.member.append(['Bamboo Forest Creek' ,'Crazy obsession']) and member.extend(['Bamboo Forest Creek','Crazy obsession']) have the same effect?

Answer: It’s different. member.append(['Bamboo Grove','Crazy obsession']) is to add the ['Bamboo Grove','Crazy obsession'] parameters at the end of the member list,

And member.extend (['Bamboo Forest Creek', 'Crazy Obsession']) is to add the two parameters of Bamboo Forest Creek and Crazy Obsession at the end of the member list.

4. There is a list name = ['F','i','h','C']. If you want to insert the element 's' between the elements 'i' and 'h', what method should be used? insert?

Answer: Use the insert() method, add in front of the element h: name.insert(2,'s')

Move your hands:

0. Do it yourself, in the following case, add data to the list Which method should be used better?

member = ['Little Turtle','Heiye','Lost','Yijing','Autumn Dance Sunset']

Changed to:

['Little Turtle', 88, 'Heiye', 90, 'Lost', 85, 'Yijing', 90, 'Autumn Dance in the Setting Sun', 88]

Method 1: Use insert() and append()

Method 2: Re-create a list overwrite with the same name.

Answer:

The second method is better. It can be done with one command: ['Little Turtle', 88, 'Dark Night', 90, 'Lost', 85, 'Yijing', 90, 'Autumn Dance in the Setting Sun' , 88]

Usage method one requires a lot of commands:

member.insert(1,88)

member.insert(3,90)

member.insert(5,85)

member. insert(7,90)

member.append(88)

1. Use a for loop to print each content in the member list above:

Answer:

>>> forname in member:
...      print(name)
...
小甲鱼
88
黑夜
90
迷途
85
怡静
90
秋舞斜阳
88

2. Modify the printing format:

Answer :

方法1：
>>> forname in range(len(member)):
...     if name % 2 == 0:         
...         print(member[name:name+2])
['小甲鱼', 88]
['黑夜', 90]
['迷途', 85]
['怡静', 90]
['秋舞斜阳', 88]