数据类型方法

Posted 2020-09-21 hijacklinux

字符串是一个类，"hello world"是它的对象

常用方法：

• 移除空白
• 分割
• 长度
• 索引
• 切片

class str(basestring):

    def capitalize(self):  
        """ 首字母变大写 """
             （返回副本）

    def center(self, width, fillchar=None):  
        """ 内容居中，width：总长度；fillchar：空白处填充内容，默认无 """
       
    def count(self, sub, start=None, end=None):  
        """ 子序列个数 """
      
     
    def decode(self, encoding=None, errors=None):  
        """ 解码 """
     

    def encode(self, encoding=None, errors=None):  
        """ 编码，针对unicode """
      

    def endswith(self, suffix, start=None, end=None):  
        """ 是否以 xxx 结束 """
       
    def expandtabs(self, tabsize=None):  
        """ 将tab转换成空格，默认一个tab转换成8个空格 """
                    （返回副本）

    def find(self, sub, start=None, end=None):  
        """ 寻找子序列位置，如果没找到，返回 -1 """
      
    def format(*args, **kwargs): # known special case of str.format
        """ 字符串格式化，动态参数，将函数式编程时细说 """
      

    def index(self, sub, start=None, end=None):  
        """ 子序列位置，如果没找到，报错 """
      

    def isalnum(self):  
        """ 是否是字母和数字 """
     
    def isalpha(self):  
        """ 是否是字母 """
      

    def isdigit(self):  
        """ 是否是数字 """
      
    def islower(self):  
        """ 是否小写 """
       

    def isspace(self):  
       

    def istitle(self):  
      

    def isupper(self):  
       

    def join(self, iterable):  
        """ 连接 """
       

    def ljust(self, width, fillchar=None):  
        """ 内容左对齐，右侧填充 """
      
    def lower(self):  
        """ 变小写 """
                   （返回副本）
   
    def lstrip(self, chars=None):  
        """ 移除左侧空白 """
                  （返回副本）  

    def partition(self, sep):  
        """ 分割，前，中，后三部分 """
      
    def replace(self, old, new, count=None):  
        """ 替换 """
                 （返回副本）  

    def rfind(self, sub, start=None, end=None):  
      
    def rindex(self, sub, start=None, end=None):  
       

    def rjust(self, width, fillchar=None):  
      

    def rpartition(self, sep):  
     

    def rsplit(self, sep=None, maxsplit=None):  
     

    def rstrip(self, chars=None):  
                   （返回副本）

    def split(self, sep=None, maxsplit=None):  
        """ 分割， maxsplit最多分割几次 """
      

    def splitlines(self, keepends=False):  
        """ 根据换行分割 """
      

    def startswith(self, prefix, start=None, end=None):  
        """ 是否起始 """
     

    def strip(self, chars=None):  
        """ 移除两端空白 """
                  （返回副本）

    def swapcase(self):  
        """ 大写变小写，小写变大写 """
      

    def title(self):  
      

    def translate(self, table, deletechars=None):  
        """
        转换，需要先做一个对应表，最后一个表示删除字符集合
        intab = "aeiou"
        outtab = "12345"
        trantab = maketrans(intab, outtab)
        str = "this is string example....wow!!!"
        print str.translate(trantab, ‘xm‘)
        """
              （返回副本）   

      

    def upper(self):  
                   （返回副本）
    def zfill(self, width):  
        """方法返回指定长度的字符串，原字符串右对齐，前面填充0。"""
       

    def _formatter_field_name_split(self, *args, **kwargs): # real signature unknown
        pass

    def _formatter_parser(self, *args, **kwargs): # real signature unknown
        pass

    def __add__(self, y):  
        """ x.__add__(y) <==> x+y """
        pass

    def __contains__(self, y):  
        """ x.__contains__(y) <==> y in x """
        pass

    def __eq__(self, y):  
        """ x.__eq__(y) <==> x==y """
        pass

    def __format__(self, format_spec):  
        """
        S.__format__(format_spec) -> string
        
        Return a formatted version of S as described by format_spec.
        """
        return ""

    def __getattribute__(self, name):  
        """ x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __getitem__(self, y):  
        """ x.__getitem__(y) <==> x[y] """
        pass

    def __getnewargs__(self, *args, **kwargs): # real signature unknown
        pass

    def __getslice__(self, i, j):  
        """
        x.__getslice__(i, j) <==> x[i:j]
                   
                   Use of negative indices is not supported.
        """
        pass

    def __ge__(self, y):  
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y):  
        """ x.__gt__(y) <==> x>y """
        pass

    def __hash__(self):  
        """ x.__hash__() <==> hash(x) """
        pass

    def __init__(self, string=‘‘): # known special case of str.__init__
        """
        str(object=‘‘) -> string
        
        Return a nice string representation of the object.
        If the argument is a string, the return value is the same object.
        # (copied from class doc)
        """
        pass

    def __len__(self):  
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y):  
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y):  
        """ x.__lt__(y) <==> x<y """
        pass

    def __mod__(self, y):  
        """ x.__mod__(y) <==> x%y """
        pass

    def __mul__(self, n):  
        """ x.__mul__(n) <==> x*n """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more):  
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y):  
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self):  
        """ x.__repr__() <==> repr(x) """
        pass

    def __rmod__(self, y):  
        """ x.__rmod__(y) <==> y%x """
        pass

    def __rmul__(self, n):  
        """ x.__rmul__(n) <==> n*x """
        pass

    def __sizeof__(self):  
        """ S.__sizeof__() -> size of S in memory, in bytes """
        pass

    def __str__(self):  
        """ x.__str__() <==> str(x) """
        pass

str

str方法

 

list方法：

基本操作：

• 索引
• 切片
• 追加
• 删除
• 长度
• 切片
• 循环
• 包含

class list(object):
    """
    list() -> new empty list
    list(iterable) -> new list initialized from iterable‘s items
    """
    def append(self, p_object): # real signature unknown; restored from __doc__
        """ L.append(object) -- append object to end """
        pass

    def count(self, value): # real signature unknown; restored from __doc__
        """ L.count(value) -> integer -- return number of occurrences of value """
        return 0

    def extend(self, iterable): # real signature unknown; restored from __doc__
        """ L.extend(iterable) -- extend list by appending elements from the iterable """
        pass

    def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__
        """
        L.index(value, [start, [stop]]) -> integer -- return first index of value.
        Raises ValueError if the value is not present.
        """
        return 0

    def insert(self, index, p_object): # real signature unknown; restored from __doc__
        """ L.insert(index, object) -- insert object before index """
        pass

    def pop(self, index=None): # real signature unknown; restored from __doc__
        """
        L.pop([index]) -> item -- remove and return item at index (default last).
        Raises IndexError if list is empty or index is out of range.
        """
        pass

    def remove(self, value): # real signature unknown; restored from __doc__
        """
        L.remove(value) -- remove first occurrence of value.
        Raises ValueError if the value is not present.
        """
        pass

    def reverse(self): # real signature unknown; restored from __doc__
        """ L.reverse() -- reverse *IN PLACE* """
        pass

    def sort(self, cmp=None, key=None, reverse=False): # real signature unknown; restored from __doc__
        """
        L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*;
        cmp(x, y) -> -1, 0, 1
        """
        pass

    def __add__(self, y): # real signature unknown; restored from __doc__
        """ x.__add__(y) <==> x+y """
        pass

    def __contains__(self, y): # real signature unknown; restored from __doc__
        """ x.__contains__(y) <==> y in x """
        pass

    def __delitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__delitem__(y) <==> del x[y] """
        pass

    def __delslice__(self, i, j): # real signature unknown; restored from __doc__
        """
        x.__delslice__(i, j) <==> del x[i:j]
                   
                   Use of negative indices is not supported.
        """
        pass

    def __eq__(self, y): # real signature unknown; restored from __doc__
        """ x.__eq__(y) <==> x==y """
        pass

    def __getattribute__(self, name): # real signature unknown; restored from __doc__
        """ x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __getitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__getitem__(y) <==> x[y] """
        pass

    def __getslice__(self, i, j): # real signature unknown; restored from __doc__
        """
        x.__getslice__(i, j) <==> x[i:j]
                   
                   Use of negative indices is not supported.
        """
        pass

    def __ge__(self, y): # real signature unknown; restored from __doc__
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y): # real signature unknown; restored from __doc__
        """ x.__gt__(y) <==> x>y """
        pass

    def __iadd__(self, y): # real signature unknown; restored from __doc__
        """ x.__iadd__(y) <==> x+=y """
        pass

    def __imul__(self, y): # real signature unknown; restored from __doc__
        """ x.__imul__(y) <==> x*=y """
        pass

    def __init__(self, seq=()): # known special case of list.__init__
        """
        list() -> new empty list
        list(iterable) -> new list initialized from iterable‘s items
        # (copied from class doc)
        """
        pass

    def __iter__(self): # real signature unknown; restored from __doc__
        """ x.__iter__() <==> iter(x) """
        pass

    def __len__(self): # real signature unknown; restored from __doc__
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y): # real signature unknown; restored from __doc__
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y): # real signature unknown; restored from __doc__
        """ x.__lt__(y) <==> x<y """
        pass

    def __mul__(self, n): # real signature unknown; restored from __doc__
        """ x.__mul__(n) <==> x*n """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y): # real signature unknown; restored from __doc__
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self): # real signature unknown; restored from __doc__
        """ x.__repr__() <==> repr(x) """
        pass

    def __reversed__(self): # real signature unknown; restored from __doc__
        """ L.__reversed__() -- return a reverse iterator over the list """
        pass

    def __rmul__(self, n): # real signature unknown; restored from __doc__
        """ x.__rmul__(n) <==> n*x """
        pass

    def __setitem__(self, i, y): # real signature unknown; restored from __doc__
        """ x.__setitem__(i, y) <==> x[i]=y """
        pass

    def __setslice__(self, i, j, y): # real signature unknown; restored from __doc__
        """
        x.__setslice__(i, j, y) <==> x[i:j]=y
                   
                   Use  of negative indices is not supported.
        """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ L.__sizeof__() -- size of L in memory, in bytes """
        pass

    __hash__ = None

list

列表方法

 

元组：带上枷锁的列表，方法同列表，但元组不可更改

如果想更新元组：temp=(1,2,3,4)           temp=temp(:2)+(‘hello‘,)+temp(2:)

字典：{键：值，键：值。。。}

创建字典：

person = {"name": "mr.wu", ‘age‘: 18}
或
person = dict({"name": "mr.wu", ‘age‘: 18})

常用操作：

• 索引
• 新增
• 删除  del dict[key]
• 键、值、键值对
• 循环
• 长度

for i in 字典：
    print（i） #默认输出key
for k,v in 字典：
    print(k)
    print(v)

其他：

enumrate

为可迭代的对象添加序号

li = [11,22,33]
for k,v in enumerate(li, 1):   #默认从0开始自增，这里是从1开始自增
    print(k,v)  #打印 1,11    2,22    3,33

range和xrange

指定范围，生成指定的数字

2.7中range(1,10),直接就创建1-9，xrange(1,10),只有在迭代的时候才创建1-9，提高效率

print range(1, 10)
# 结果：[1, 2, 3, 4, 5, 6, 7, 8, 9]
 
print range(1, 10, 2)
# 结果：[1, 3, 5, 7, 9]
 
print range(30, 0, -2)
# 结果：[30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2]　　

3.5中的range就相当于2.7中的xrange