012_list

#!/usr/bin/env python
# Author:liujun

names = []
    # Define an empty list

names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen"]
print(names)

print(names[0])
    # Take the first element in the list

print(names[1:3])
    # Take continuous elements from the first one to the second one(not the third one,left closed and right open)

print(names[-1])
    # Take the last element

print(names[-2:])
    # Take the last two elements,

print(names[0:3])
print(names[:3])
    # Take the first three elements


names.append("LeiHaidong")
    # Append a new element

names.insert(1, "ChenRongHua")
    # Insert a new element in a specified location

names[2] = "XieDi"
    # replace the second element with "XieDi"

names.remove("ChenRongHua")
    # remove an element by name
del names[2]
    # delete an element by index
names.pop()
    # delete the last element if the parameter is not given,or delete an element by index like del names[2]


print(names)


names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen","ZhangYang1", "Guyun1", "XiangPeng1", "XuLiangchen1","XieDi"]


print(names.index("XieDi"))
    # Get the first index of a specified element

print(names.count("GuYun"))
    # Count the number of specified element

names.clear()
    # empty the list

names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen", "ZhangYang1", "Guyun1", "XiangPeng1", "XuLiangchen1", "XieDi"]
names.reverse()
    # Reverse the list

names.sort()
    # sort the list

names2 = [1,2,3,4]
names.extend(names2)
    # Extend the original list with a new list



# Shallow copy
names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen", ["ZhangYang1", "Guyun1", "XiangPeng1"], "XuLiangchen1", "XieDi"]
names2 = names.copy();
names[1] = "zzzzzzzzzzzzzz"
names[4][1] = "gggggggggggggg"
print(names)
print(names2)

# Shallow copy
import copy
names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen", ["ZhangYang1", "Guyun1", "XiangPeng1"], "XuLiangchen1", "XieDi"]
names2 = copy.copy(names) # equals to  names2 = names.copy();
names[1] = "zzzzzzzzzzzzzz"
names[4][1] = "gggggggggggggg"
print(names)
print(names2)

# deep copy
names = ["ZhangYang", "Guyun", "XiangPeng", "XuLiangchen", ["ZhangYang1", "Guyun1", "XiangPeng1"], "XuLiangchen1", "XieDi"]
names2 = copy.deepcopy(names)
names[1] = "zzzzzzzzzzzzzz"
names[4][1] = "gggggggggggggg"
print(names)
print(names2)

# Traverse a list
for element in names:
    print(element)

for element in names:
    print(names.index(element), element)

for index,element in enumerate(names):
    print(index,element)