Python3 实例定义一个列表，并计算某个元素在列表中出现的次数。
例如：
输入 : lst = [15, 6, 7, 10, 12, 20, 10, 28, 10] x = 10输出 : 3
实例 1
def countX(lst, x):
count = 0
for ele in lst:
if (ele == x):
count = count + 1
return count
lst = [8, 6, 8, 10, 8, 20, 10, 8, 8]
x = 8
print(countX(lst, x))
count = 0
for ele in lst:
if (ele == x):
count = count + 1
return count
lst = [8, 6, 8, 10, 8, 20, 10, 8, 8]
x = 8
print(countX(lst, x))
以上实例输出结果为：
5
实例 2: 使用 count() 方法
def countX(lst, x):
return lst.count(x)
lst = [8, 6, 8, 10, 8, 20, 10, 8, 8]
x = 8
print(countX(lst, x))
return lst.count(x)
lst = [8, 6, 8, 10, 8, 20, 10, 8, 8]
x = 8
print(countX(lst, x))
以上实例输出结果为：
5