内置函数

Posted 2020-10-19 uulinux

内置函数

掌握：

divmod
 print(divmod(10011,25))


enumerate
l=[‘a‘,‘b‘,‘c‘]

for i in l:
    print(l.index(i),i,)

for i,v in enumerate(l):
    print(i,v)



eval:
res=eval(‘[1,2,3]‘)
print(res,type(res))

res=exec(‘[1,2,3]‘)
print(res)


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

round
print(round(3.5))

了解

print(abs(-1))

print(all([1,‘a‘,‘b‘,0]))
print(all([]))

print(any([None,False,0,1]))
print(any([]))


print(bin(11))
print(hex(11))
print(oct(11))

print(‘xxx‘.encode(‘utf-8‘))
print(bytes(‘xxx‘,encoding=‘utf-8‘))

print(callable(max))

print(chr(65))
print(chr(90))
print(chr(39))
print(ord(‘A‘))
print(ord(‘@‘))


import os
print(dir(os))


s=set({1,2,3})
s.add(4)
print(s)

s=frozenset({1,2,3}) #不可变集合

print(hash(‘xxx‘))

l=[1,2,‘a‘,4]
print(list(reversed(l)))


s=slice(1,5,2)
l=[‘a‘,‘b‘,‘c‘,‘d‘,‘e‘]

# print(l[1:5:2])
# print(l[1:5:2])

print(l[s])


print(vars() is locals())

面向对象(以后介绍)

# classmethod
# staticmethod
# property
#
#
# hasattr
# getattr
# setattr
# delattr
#
# isinstance
# issubclass
#
# object
#
# super

# obj.__dict__() #vars(obj)

#__import__
# choice=input(‘>>: ‘)
# print(choice,type(choice))
#
# # import ‘time‘
# m=__import__(choice)
# m.sleep(10)