method of string

(sandbox) PS G:\workspace\py\sandbox\standards> python
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> dir('')
>>> for i in dir(''):
...     print(i)
...
__add__
__class__
__contains__
__delattr__
__dir__
__doc__
__eq__
__format__
__ge__
__getattribute__
__getitem__
__getnewargs__
__gt__
__hash__
__init__
__init_subclass__
__iter__
__le__
__len__
__lt__
__mod__
__mul__
__ne__
__new__
__reduce__
__reduce_ex__
__repr__
__rmod__
__rmul__
__setattr__
__sizeof__
__str__
__subclasshook__
capitalize  ##
casefold
center
count
encode
endswith  ##
expandtabs
find
format  ##
format_map
index
isalnum  ##
isalpha  ##
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
>>> quit()