python课堂整理16---内置函数

print(abs(-1))

print(all([12,‘asds‘,345]))
print(all(‘‘))    #特例 若参数为空也返回True
print(all((0,)))
print(all([]))

print(any([1231, 0]))
print(any([0]))

print(bin(3))   # 10进制转化为二进制
print(hex(15))  # 10进制转化为16进制
print(oct(15))  # 10  进制转化为8进制

print(bool(0))
print(bool(‘‘))  #可以是空列表空元组
print(bool(None))

name = ‘大白‘
print(bytes(name, encoding = ‘utf - 8‘))  # utf-8 一个中文 = 3 个字节

name = ‘大白‘
print(bytes(name, encoding = ‘utf - 8‘).decode(‘utf-8‘))

print(chr(1223))

print(dir(dict))

print(divmod(10, 3))   10/3 商3余1

dic_str1 = "{‘name‘: ‘alex‘}"
print((eval(dic_str1)))
print(type(eval(dic_str1)))
print(type(dic_str1))

express = ‘1 + 1‘
print(eval(express))

print(hash(‘shfduqwhfkwsajdfh9237498231‘))
print(hash(‘5211314‘))
print(hash(‘5211314safhciwsafhwiofhdajskdhjioas;fhdasiodcjasodfacxasd‘))
name = ‘jinling‘
print(hash(name))
print(hash(name))
name = ‘dabai‘
print(hash(name))

print(isinstance(1, int))
print(isinstance(‘abc‘, str))
print(isinstance([], list))
print(isinstance([], tuple))

name = ‘天青色等烟雨而我在等你‘
print(globals())
def test():
    age = ‘18‘
    print(locals())
test()

age_dic = {‘alex3‘: 18, ‘liu1‘: 17, ‘jinling2‘: 16}
print(max(age_dic.values())) #指定比较values
print(max(age_dic))  #默认比较的是key, 一位一位的比较

l1 = [
    (5, ‘e‘),
    (1, ‘l‘),
    (3, ‘o‘),
    (2, ‘v‘)
]
print(max(l1))

print(list(zip([‘l‘, ‘o‘, ‘v‘, ‘e‘], [1, 2, 3, 4])))

p = {‘name‘: ‘alex‘, ‘age‘: 18, ‘gender‘: ‘none‘}
print(list(zip(p.keys(), p.values())))

dic = {‘age‘: 18, ‘age2‘: 10}
print(max(dic))  #默认比较的是key
print(max(dic.values()))   #比较的是key,但不知道是哪个key的

print(max(zip(dic.values(), dic.keys())))

people = [
    {‘name‘: ‘dabai‘, ‘age‘: 21},
    {‘name‘: ‘jinling‘, ‘age‘: 19},
    {‘name‘: ‘liu‘, ‘age‘: 20},
    {‘name‘: ‘sb‘, ‘age‘: 100}
]
print(max(people, key=lambda dic: dic[‘age‘])) #自己写函数规则

li = [3, 5, 9, 7]
l2 = []
while len(li) > 1:
    a = min(li)
    l2.append(a)
    li.remove(a)
l2.append(li[0])
print(l2)

print(chr(97))
print(ord(‘a‘))

print(pow(2, 2))   #2**3 
print(pow(2, 2, 3)) #2**3 % 3 

l1 = [1, 2, 3, 4, 5]
print(list(reversed(l1)))

print(round(4.6))

print(set(‘jinling‘))

l = ‘jinling‘
s1 = slice(3, 5)
print(l[s1])
s2 = slice(2, 5, 2)
print(l[s2])
print(s2.start)
print(s2.stop)
print(s2.step)

l = [3, 2, 15, 7]
print(sorted(l))

people = [
    {‘name‘: ‘dabai‘, ‘age‘: 21},
    {‘name‘: ‘jinling‘, ‘age‘: 19},
    {‘name‘: ‘liu‘, ‘age‘: 20},
    {‘name‘: ‘sb‘, ‘age‘: 100}
]
print(sorted(people, key = lambda dic: dic[‘age‘]))

name_dic = {
    ‘liuwenhao‘: 10000,
    ‘jinling‘: 9999,
    ‘dabai‘: 9998
}
print(sorted(name_dic))  #默认比较key值
print(sorted(name_dic, key = lambda key: name_dic[key]))
print(sorted(zip(name_dic.keys(), name_dic.values())))

l1 = [1, 2, 4, 5, 6]
print(sum(l1))

print(type(‘love‘))

def test():
    msg = ‘月下门筒喟叹昨夜太平长安‘
    print(locals())
    print(vars()) #没有参数时，效果和locals一样
test()
print(vars(int))  #把int下所有方法存成字典的形式

module_name = ‘test‘
m = __import__(module_name)
m.say_hai() #使用test中的方法