#【Python】【基础知识】【内置对象常用方法】

>>> dir(int)
[‘__abs__‘,‘__add__‘,‘__and__‘,‘__bool__‘,‘__ceil__‘,‘__class__‘,‘__delattr__‘,‘__dir__‘,‘__divmod__‘,‘__doc__‘,‘__eq__‘,‘__float__‘,‘__floor__‘,‘__floordiv__‘,‘__format__‘,‘__ge__‘,‘__getattribute__‘,‘__getnewargs__‘,‘__gt__‘,‘__hash__‘,‘__index__‘,‘__init__‘,‘__init_subclass__‘,‘__int__‘,‘__invert__‘,‘__le__‘,‘__lshift__‘,‘__lt__‘,‘__mod__‘,‘__mul__‘,‘__ne__‘,‘__neg__‘,‘__new__‘,‘__or__‘,‘__pos__‘,‘__pow__‘,‘__radd__‘,‘__rand__‘,‘__rdivmod__‘,‘__reduce__‘,‘__reduce_ex__‘,‘__repr__‘,‘__rfloordiv__‘,‘__rlshift__‘,‘__rmod__‘,‘__rmul__‘,‘__ror__‘,‘__round__‘,‘__rpow__‘,‘__rrshift__‘,‘__rshift__‘,‘__rsub__‘,‘__rtruediv__‘,‘__rxor__‘,‘__setattr__‘,‘__sizeof__‘,‘__str__‘,‘__sub__‘,‘__subclasshook__‘,‘__truediv__‘,‘__trunc__‘,‘__xor__‘,‘bit_length‘,‘conjugate‘,‘denominator‘,‘from_bytes‘,‘imag‘,‘numerator‘,‘real‘,‘to_bytes‘]

>>> import math
>>> dir(math)
[‘__doc__‘,‘__loader__‘,‘__name__‘,‘__package__‘,‘__spec__‘,‘acos‘,‘acosh‘,‘asin‘,‘asinh‘,‘atan‘,‘atan2‘,‘atanh‘,‘ceil‘,‘copysign‘,‘cos‘,‘cosh‘,‘degrees‘,‘e‘,‘erf‘,‘erfc‘,‘exp‘,‘expm1‘,‘fabs‘,‘factorial‘,‘floor‘,‘fmod‘,‘frexp‘,‘fsum‘,‘gamma‘,‘gcd‘,‘hypot‘,‘inf‘,‘isclose‘,‘isfinite‘,‘isinf‘,‘isnan‘,‘ldexp‘,‘lgamma‘,‘log‘,‘log10‘,‘log1p‘,‘log2‘,‘modf‘,‘nan‘,‘pi‘,‘pow‘,‘radians‘,‘remainder‘,‘sin‘,‘sinh‘,‘sqrt‘,‘tan‘,‘tanh‘,‘tau‘,‘trunc‘]

>>> dir(str)
[‘__add__‘,‘__contains__‘,‘__getitem__‘,‘__iter__‘,‘__len__‘,‘capitalize‘,‘casefold‘,‘center‘,‘count‘,‘encode‘,‘endswith‘,‘expandtabs‘,‘find‘,‘format‘,‘format_map‘,‘index‘,‘isalnum‘,‘isalpha‘,‘isascii‘,‘isdecimal‘,‘isdigit‘,‘isidentifier‘,‘islower‘,‘isnumeric‘,‘isprintable‘,‘isspace‘,‘istitle‘,‘isupper‘,‘join‘,‘ljust‘,‘lower‘,‘lstrip‘,‘maketrans‘,‘partition‘,‘replace‘,‘rfind‘,‘rindex‘,‘rjust‘,‘rpartition‘,‘rsplit‘,‘rstrip‘,‘split‘,‘splitlines‘,‘startswith‘,‘strip‘,‘swapcase‘,‘title‘,‘translate‘,‘upper‘,‘zfill‘]

>>> import string
>>> dir(string)
[‘Formatter‘,‘Template‘,‘_ChainMap‘,‘_TemplateMetaclass‘,‘__all__‘,‘__builtins__‘,‘__cached__‘,‘__file__‘,‘_re‘,‘_string‘,‘ascii_letters‘,‘ascii_lowercase‘,‘ascii_uppercase‘,‘capwords‘,‘digits‘,‘hexdigits‘,‘octdigits‘,‘printable‘,‘punctuation‘,‘whitespace‘]

>>> l
[1,3,4,5] >>> "#".join(str(n) for n in l) ‘1#3#4#5‘

>>> dir(list)
[‘__add__‘,‘__delitem__‘,‘__iadd__‘,‘__imul__‘,‘__reversed__‘,‘__setitem__‘,‘append‘,‘clear‘,‘copy‘,‘extend‘,‘insert‘,‘pop‘,‘remove‘,‘reverse‘,‘sort‘]

>>> dir(tuple)
[‘__add__‘,‘index‘]