内置函数

Posted 2021-01-04 nyqxiaoqiang

#内置函数

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# abs(1)#取绝对值
# print(all((1,2,3)))#迭代数据是否为真
# any([0,1,2])#是否有一个为真
# print(ascii("喝喝"))#打印表示形式的字符串
# a = bytes("abcde",encoding="utf-8")#打印表示形式的二进制
# print(a)
# b=bytearray("abcde",encoding="utf-8")#打印表示形式的二进制位置
# print(b)
# print(b[1])
# a=‘1‘
# # print(callable(a))#是否可调用
# def call ():pass
# print(callable(call))
#eval(a)#将字符串转换成字典形式调用
#exec()#将字符串转换成可执行代码

#匿名函数lambda
# (lambda x:print(x))(5)
# b=(lambda n:3 if n<4 else n)
# print(b(6))

#剔除 filter
# res = filter(lambda n:n>5,range(10))
# for i in res:
#     print(i)

#对每个进行处理
# res=map(lambda n:n*2,range(10))
#reduce 不可迭代
# import functools 运算
# res=functools.reduce(lambda x,y:x*y,range(1,10))
# print(res)

#冻结frozenset
# b = frozenset([1,2,3,4,5])
# print(globals())

#查看全局变量globals
# print(globals())
#更新并返回表示当前本地符号表的字典
# local_var=444
# def test():
#     local_var =333
#     print(locals())
#     print(globals())
# test()
# print(locals())
# print(globals())
# 排序 sorted
# a = {6:2,8:0,1:4,-5:6,99:11,4:22}
# print(  sorted(a.items()) )
# print(  sorted(a.items(),key=lambda x:x[1]) )
# print(a )
#安最小排列 zip
# a = [1,2,3,4,5,6]
# b = [‘a‘,‘b‘,‘c‘,‘d‘]
# for i in zip(a,b):
#     print(i)
# #导入字符串的变量
# __import__("text1")
# aa = ["a","b",‘c‘,"d"]
# print(aa)
# #转换16进制
# hex()
# #转换8进制
# oct()
#chr and ord acssi码
print(chr(97))
print(ord("b"))