memo

for x in dir(''):
  print('{}: {}'.format(x,type(x)))

__add__: <class 'str'>
__class__: <class 'str'>
__contains__: <class 'str'>
__delattr__: <class 'str'>
__dir__: <class 'str'>
__doc__: <class 'str'>
__eq__: <class 'str'>
__format__: <class 'str'>
__ge__: <class 'str'>
__getattribute__: <class 'str'>
__getitem__: <class 'str'>
__getnewargs__: <class 'str'>
__gt__: <class 'str'>
__hash__: <class 'str'>
__init__: <class 'str'>
__init_subclass__: <class 'str'>
__iter__: <class 'str'>
__le__: <class 'str'>
__len__: <class 'str'>
__lt__: <class 'str'>
__mod__: <class 'str'>
__mul__: <class 'str'>
__ne__: <class 'str'>
__new__: <class 'str'>
__reduce__: <class 'str'>
__reduce_ex__: <class 'str'>
__repr__: <class 'str'>
__rmod__: <class 'str'>
__rmul__: <class 'str'>
__setattr__: <class 'str'>
__sizeof__: <class 'str'>
__str__: <class 'str'>
__subclasshook__: <class 'str'>
capitalize: <class 'str'>
casefold: <class 'str'>
center: <class 'str'>
count: <class 'str'>
encode: <class 'str'>
endswith: <class 'str'>
expandtabs: <class 'str'>
find: <class 'str'>
format: <class 'str'>
format_map: <class 'str'>
index: <class 'str'>
isalnum: <class 'str'>
isalpha: <class 'str'>
isascii: <class 'str'>
isdecimal: <class 'str'>
isdigit: <class 'str'>
isidentifier: <class 'str'>
islower: <class 'str'>
isnumeric: <class 'str'>
isprintable: <class 'str'>
isspace: <class 'str'>
istitle: <class 'str'>
isupper: <class 'str'>
join: <class 'str'>
ljust: <class 'str'>
lower: <class 'str'>
lstrip: <class 'str'>
maketrans: <class 'str'>
partition: <class 'str'>
replace: <class 'str'>
rfind: <class 'str'>
rindex: <class 'str'>
rjust: <class 'str'>
rpartition: <class 'str'>
rsplit: <class 'str'>
rstrip: <class 'str'>
split: <class 'str'>
splitlines: <class 'str'>
startswith: <class 'str'>
strip: <class 'str'>
swapcase: <class 'str'>
title: <class 'str'>
translate: <class 'str'>
upper: <class 'str'>
zfill: <class 'str'>