"""
求一个列表中的最大值
"""
def max_element(num_list):
    max_num = 0
    for i in num_list:
        if i>=max_num:
            max_num=i
    return max_num
num_list=[1,2,3,4]
print(max_element(num_list))

#方法二
max_Num=max(num_list)
print(max_Num)