可变字符串
"""Are you still suffering from inefficiency caused by frequent changes to strings?
This module can help you solve that problem!
"""
class char(str):
def __init__(self, string):
if isinstance(string, str):
if len(string) == 1:
self.char = string
else:
raise ValueError("the length outside 1")
else:
raise TypeError("input is a not string")
class MutableString(object):
def __init__(self, string):
'''
input: A string object
output: None
init a new object
'''
if isinstance(string, str):
self.string = list(string)
elif isinstance(string, list):
self.string = string
else:
raise TypeError("arg can only be a list or string")
pass
def __add__(self, other):
if isinstance(other, MutableString):
return MutableString(self.string + other.string)
elif isinstance(other, str):
return MutableString(self.string + list(other))
else:
raise TypeError("arg can only be a MutableString object or a string")
pass
__radd__ = __add__
def __mul__(self, other):
if isinstance(other, int):
return MutableString(self.string * other)
def __getattr__(self, name):
if name == "str":
return self.get_string()
else:
return super().__getattr__(name)
pass
def __setattr__(self, name, value):
if name == "str":
if isinstance(value, str):
self.string = list(value)
elif isinstance(value, list):
self.string = value
else:
raise TypeError("arg can only be a list or string")
else:
super().__setattr__(name, value)
pass
def __getitem__(self, index):
return self.string
def __setitem__(self, index, value):
self.string = value
pass
def __delitem__(self, index):
del self.string
pass
def __repr__(self):
return "\""+"".join(self.string)+"\""
__str__ = __repr__
# new function
def append(self, string: char):
'''
input: A string object
output: None
append value
'''
if isinstance(string, char):
self.string.extend(list(string))
pass
else:
raise TypeError("arg can only be a char")
pass
def pop(self, index: int):
'''
input: A index value (int type)
output: a string object
delete the element corresponding to the index
'''
try:
return self.string.pop(index)
except IndexError:
raise IndexError("string index out of range")
except (ValueError, TypeError):
raise TypeError("input is a not number")
pass
def insert(self, index: int, value: char):
'''
input: Insert index, value
output: None
insert value in index
'''
if isinstance(value, char):
self.string.insert(index, value)
else:
raise TypeError("arg can only be a char")
pass
def delete_paragraph(self, start: int=None, stop: int=None):
'''
input: Start index, stop index
output: None
delete all char in start - stop
'''
if start == None:
start = 0
if stop == None:
stop = len(self.string)
if isinstance(start, int) and isinstance(stop, int):
del self.string
pass
def get_string(self):
'''
input: string function name, all args (tuple type)
output: string function return value
run string function
'''
return ''.join(self.string)
优点：
进行操作时不用创建一个新字符串。
缺点：
参数必须是char类型。 {:10_275:}
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