python list使用

name = ['aaa', 'bbb', 'ccc', 'ddd']
print(name)

#len获取list长度
n = len(name)
print(n)

#访问列表中的值
print(name[0])
print(name[-1])

#循环遍历列表的值
for each_name in name:
    print(each_name)

#使用range来循环遍历列表的值
for i in range(len(name)):
    print(name[i])

输出：
['aaa', 'bbb', 'ccc', 'ddd']
4
aaa
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd

name = ['aaa', 'bbb', 'ccc', 'ddd']
print(name)

#append()在list末尾添加元素
name.append('eee')
print(name)

#insert()是在指定位置添加元素
name.insert(1, 'fff')
print(name)

#pop()删除list末尾的元素
name.pop()
print(name)

#删除指定位置的元素，用pop[i]方法
name.pop(0)
print(name)

输出：
['aaa', 'bbb', 'ccc', 'ddd']
['aaa', 'bbb', 'ccc', 'ddd', 'eee']
['aaa', 'fff', 'bbb', 'ccc', 'ddd', 'eee']
['aaa', 'fff', 'bbb', 'ccc', 'ddd']
['fff', 'bbb', 'ccc', 'ddd']

name = ['aaa', 'bbb', 'ccc', 'ddd']
print(name)

#list切片
print(name[1:3])

#name[start:end:step]
#start表示开始  end表示结束 step表示步长
print(name[::2])

#step为-1时，逆序排序
print(name[::-1])

输出：
['aaa', 'bbb', 'ccc', 'ddd']
['bbb', 'ccc']
['aaa', 'ccc']
['ddd', 'ccc', 'bbb', 'aaa']