python函数第6天（day 25）

Posted 2020-10-04

内置 函数：

# print(abs(-1))
# print(abs(0))
#
#
# print(all(‘ ‘))
# print(all((1,‘ ‘,2,None)))
# print(all(i for i in range(1,10)))


# print(any([]))
# print(any([None,0,‘‘,{},1]))

# res=sum(i for i in range(3))
# print(res)



# print(bin(3))
#
#
# print(bool(0))
# print(bool(None))
# print(bool(‘‘))
#
#
# print(bytes(‘hello‘,encoding=‘utf-8‘))


# def test():
#     pass
# print(callable(test))
# print(callable(sum))


# print(chr(67))
# print(chr(65))
#
# print(ord(‘A‘))


#数据类型
#int
# num=1 #num=int(1)
# print(type(num)) #查看num的类型
# print(isinstance(num,int)) #判断num是否为int类型，这个才是判断类型的

# print(num is 1) # is 是身份运算，根据id去判断身份，不是判断类型的，适用于所有数据类型，字典啊，列表啊，集合啊， 

# float
# bool
# complex

# str
# x=‘asdfa‘ #x=str(‘asdfa‘)
# print(str(1))
# print(str({‘a‘:1}))

# list
# x=[]
# x=list(i for i in range(10))  list函数括号里面的要是一个可迭代的对像，是把任何可迭代的对像，变成一个列表
# print(x)

# tuple
# dict
# d={‘a‘:1}
# d=dict(x=1,y=2,z=3)
# print(d)


set
# s={1,2,3,4,4}
# print(s)
# s.add(5)
# print(s)
#
# frozenset #不可变集合
# f=frozenset({1,2,3,4})
# print(type(f))

# x=complex(1-2j)
# print(x.real)
# print(x.imag)

# x=1-2j
# print(x.real)
# print(x.imag)


l=[]

# print(dir(l))
# print(help(sum))


# print(divmod(100,33))
#
# for i in enumerate([‘a‘,‘b‘,‘c‘,‘d‘]):
#     print(i)

# for i in enumerate({‘x‘:1,‘y‘:2}):
#     print(i)

# s=‘hello‘
# print(hash(s))
# s=‘h‘
# print(hash(s))



# print(hex(10))
# print(hex(11))


# # print(id(‘asdf‘))
# a=1
# b=2
# print(id(a))
# print(id(b))
# print(a is b)
# x=‘a‘
# y=‘a‘
# print(id(x))
# print(id(y))
# print(x is y)


#max和min
# print(max(1,2,3,4,10,3))
# print(min(1,2,3,4,10,3))

salaries={
    ‘egon‘:3000,
    ‘alex‘:100000000,
    ‘wupeiqi‘:10000,
    ‘yuanhao‘:250
}

def get_value(k):
    return salaries[k]

#匿名函数
# lambda k:salaries[k]
# f=lambda k:salaries[k] 匿名函数也可以赋值一个名字，但是这便违反了匿名的初衷
# print(f)
# print(f(‘egon‘))


# print(max(salaries))
# print(max(salaries,key=get_value))
# print(max(salaries,key=lambda k:salaries[k]))
# print(min(salaries,key=lambda k:salaries[k]))

#拉链
# l1=[1,2,3,4]
# s=‘hel‘
# for i in zip(l1,s):
#     print(i)

# print(salaries.keys(),salaries.values())
# z=zip(salaries.values(),salaries.keys())
# print(z)
# for i in z:
#     print(i)

# print(max((1,‘a‘),(1,‘b‘)))




# l=[3,4,1,0,9,10]
# print(sorted(l)) #返回值是列表，默认是升序
# print(sorted(l,reverse=True)) #降序排列
#
# s=‘hello abc‘
# print(sorted(s))

#
# salaries={
#     ‘egon‘:3000,
#     ‘alex‘:100000000,
#     ‘wupeiqi‘:10000,
#     ‘yuanhao‘:250
# }
# print(sorted(salaries)) #默认是按照字典salaries的key去排序的
#
# print(sorted(salaries,key=lambda x:salaries[x]))
# print(sorted(salaries,key=lambda x:salaries[x]),reverse=True)
































#排序且修改
#
# l=[3,2,0,10]
# l=sorted(l)
#
# print(l)



# map:映射
l=[1,2,3,7,5]
# x=[i**2 for i in l]
# print(x)
m=map(lambda item:item**2,l)
# print(m)
# # for i in m:
# #     print(i)
# print(list(m))
# name_l=[‘alex‘,‘zhengjiangF4‘,‘yuanhao‘,‘wupeiqi‘]
# m=map(lambda name:name+‘SB‘,name_l)
# print(list(m))

from functools import reduce #合并
l=list(range(100))
# print(l)
# print(reduce(lambda x,y:x+y,l,100))
# i=iter(l)
# 100 next(i) --->100,0----->x,y-x+y-->100
# 100 next(i)---->100,1----->x,y--x+y-->101
# 101 next(i)----->101,2


# filter#过滤
# name_l=[
#     {‘name‘:‘egon‘,‘age‘:18},
#     {‘name‘:‘dragonFire‘,‘age‘:1000},
#     {‘name‘:‘gaoluchuan‘,‘age‘:9000},
#     {‘name‘:‘fsw‘,‘age‘:10000},
# ]
#
# f=filter(lambda d:d[‘age‘] > 100,name_l)
# print(f)
# for i in f:
#     print(i)






#其他
# print(oct(10))

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


# print(list(reversed([1,5,3,9])))

# print(round(10.3))
# print(round(10.5))
# print(round(10.6))
# print(round(10.9))

# slice
# l=[1,2,3,4,5,6,7,9]
# print(l[2:5:2])
#
#
# s=slice(2,5,2)
# print(l[s])


# print(vars() is locals())



import time
# time.sleep(3)
print(time)

m=__import__(‘time‘)
print(m)
m.sleep(3)






































#在面向对象里讲
classmethod
staticmethod
property

delattr
hasattr
getattr
setattr


issubclass

super




#complie
#eval
#exec