（面试题）python面试题集锦-附答案

sum_1_100 = sum(range(1, 101))
print(sum_1_100)  # 5050

a = 100
def foo():
    global a
    a = 300

foo()
print(a)  # 300

d1 = {"name": "wj", "age": 22}
d2 = {"male": "famle"}

# 删除键
del d1["name"]
print(d1)  # {'age': 22}

# 合并字典
d1.update(d2)
print(d1)  # {'age': 22, 'male': 'famle'}

lst = [11, 12, 11, 13, 14, 13]

# 先转为set，set内的元素不能重复
a = set(lst)
print(a)  # {11, 12, 13, 14}

# 再转为list即可
lst = [x for x in a]
print(lst)  # [11, 12, 13, 14]

class A:
    def __init__(self):
        print("这是init方法", self)

    def __new__(cls, *args, **kwargs):
        print("cls的ID:{}".format(id(cls)))
        print("这是new方法", object.__new__(cls))
        return object.__new__(cls)

A()
print("类A的id：{}".format(id(A)))

运行结果如下：

cls的ID:635807211832
这是new方法 <__main__.A object at 0x00000094090CAEB8>
这是init方法 <__main__.A object at 0x00000094090CAEB8>
类A的id：635807211832

a = [1, 2, 3, 4, 5]
b = map(lambda x:x**2, a)

c = [x for x in b if x>10]
print(c)  # [16, 25]

import random
import numpy


print(random.randint(1, 10))  # 1-10随机整数
print(numpy.random.randn(5))  # 随机生成5个小数
print(random.random())  # 随机生成0-1的小数

import re

str = '<div class="nam">中国</div>'
ret = re.findall(r'<div class=".*">(.*?)</div>', str)
print(ret)  # ['中国']

a = 3
assert (a>1)
print("断言成功，程序继续向下执行")

assert (a<1)  # # AssertionError
print("断言失败，程序报错")