1.实现count：
list1 = [1, 2, 1, 1, 2, 3, 3, 3, 4, 5, 6, 6, 7]
element1 = 6count1 = 0for element2 in list1[:]:
if element1 == element2:
count1 += 1
print(count1) # 2
# 方法2：
list1 = [1, 2, 1, 1, 2, 3, 3, 3, 4, 5, 6, 6, 7]
element1 = input("请输入：")
count1 = 0
for element2 in list1[:]:
if str(element2) == element1:
count1 += 1
print(count1)
请输入：4
1
Process finished with exit code 0
2.实现index：
# 方法1：
element = "貂蝉"
names = ['1曹操', "2刘备", "3赵云", "4小乔", "5貂蝉", "6吕布", "7赵云", "8asd"]
for i in range(len(names)):
if element == names[i]:
print(i)
break
else:
print("Error,元素不存在") # 2
# 方法2：
names = [3, "2刘备", "3赵云", 23, "5貂蝉", (1, 5, 3), "7赵云", "8asd"]
element1 = input("请输入：")
for i in range(len(names)):
if str(names[i]) == element1:
print(i)
break
else:
print("Error")
请输入：(1, 5, 3)
5
Process finished with exit code 0
3.实现extend：
names = ['曹操', "刘备", "赵云", "小乔", "貂蝉", "吕布", "赵云"]
element1 = '后裔'
if type(element1) == int:
names.append(element1)
else:
for element2 in element1[:]:
names.append(element2)
print(names) # ['曹操', '刘备', '赵云', '小乔', '貂蝉', '吕布', '赵云', '后', '裔']
4.实现reverse：
names = ['1曹操', "2刘备", "3赵云", "4小乔", "5貂蝉", "6吕布", "7赵云", "8asd"]
# 方法1：
names2 = []
for name in names[-1::-1]:
names2.append(name)
for i in range(len(names)):
names[i] = names2[i]
print(names) # ['8asd', '7赵云', '6吕布', '5貂蝉', '4小乔', '3赵云', '2刘备', '1曹操']
# 方法2：
n = len(names)
for i in range(n):
for j in range(n):
if i > j:
names[i], names[j] = names[j], names[i]
print(names) # ['8asd', '7赵云', '6吕布', '5貂蝉', '4小乔', '3赵云', '2刘备', '1曹操']
# 方法3：
n = len(names)
for i in range(n // 2):
k = n - 1 - n
names[i], names[k] = names[k], names[i]
print(names) # # ['8asd', '7赵云', '6吕布', '5貂蝉', '4小乔', '3赵云', '2刘备', '1曹操']
