2018.12.6 python基础学习——列表的魔法(一)

一、列表的功能:

1.支持for循环和while循环:

例如:

test=['lijialun',165,3,'djf','djd']
index=0
while index<len(test):
    v=test[index]
    print(v)
    index+=1
print('===')

也就相当于:

test=['lijialun',165,3,'djf','djd']
for item in test:
    print(item)
print('===')

 2.列表中元素的替换与修改:

(1)替换:

#法一:——索引
test=['lijialun',165,3,'djf','djd']
test[2]=[16,222]
print(test)
#输出结果:
#['lijialun',165,16,222,'djf','djd']
#法二:————切片

test=['lijialun',165,3,'djf','djd']
test[1:4]=[77,55,'dddddddd']
print(test)

#结果输出:
#['lijialun',77,55,'dddddddd','djd']

(2)删除:

#法一:————索引

test=['lijialun',165,3,'djf','djd']
del test[4]
print(test)

#结果输出:
#['lijialun',165,3,'djf']
#法二——切片

test=['lijialun',165,3,'djf','djd']
del test[0:3]
print(test)

#输出结果:
#['djf','djd']

 3.支持in操作:

test=[146545,'dnbch',111,222,'sb']
v='sb' in test
print(v)

#输出结果:Ture

4.可以通过索引,在列表中一直往“里”找寻:
例:

1 test=[146545,'dnbch',111,222,'sb',[1110,'fdgd',666]]
2 v1=test[1][3]
3 print(v1)
4 v2=test[5][1][3]
5 print(v2)
6 
7 #输出结果:
8 #c
9 #d
原文地址:https://www.cnblogs.com/lijialun/p/10078832.html