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Python开发【全栈-DAY-IV】:Python基本数据类型

运算符

1、算数运算:

技术分享

2、比较运算:

技术分享

3、赋值运算:

技术分享

4、逻辑运算:

技术分享

5、成员运算:

技术分享

基本数据类型

1、数字

int(整型)

  在32位机器上,整数的位数为32位,取值范围为-2**31~2**31-1,即-2147483648~2147483647
  在64位系统上,整数的位数为64位,取值范围为-2**63~2**63-1,即-9223372036854775808~9223372036854775807
技术分享 int
2、布尔值
  真或假
  1 或 0
3、字符串
"hello world"
字符串常用功能:
  • 移除空白
  • 分割
  • 长度
  • 索引
  • 切片
技术分享 str
4、列表
创建列表:
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name_list = [‘alex‘‘seven‘‘eric‘]
name_list = list([‘alex‘‘seven‘‘eric‘])

基本操作:

  • 索引
  • 切片
  • 追加
  • 删除
  • 长度
  • 切片
  • 循环
  • 包含
技术分享 list
5、元祖
创建元祖:
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ages = (1122334455)
ages = tuple((1122334455))
基本操作:
  • 索引
  • 切片
  • 循环
  • 长度
  • 包含
技术分享
lass tuple(object):
    """
    tuple() -> empty tuple
    tuple(iterable) -> tuple initialized from iterable‘s items
    
    If the argument is a tuple, the return value is the same object.
    """
    def count(self, value): # real signature unknown; restored from __doc__
        """ T.count(value) -> integer -- return number of occurrences of value """
        return 0

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

    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 __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 __getnewargs__(self, *args, **kwargs): # real signature unknown
        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 __hash__(self): # real signature unknown; restored from __doc__
        """ x.__hash__() <==> hash(x) """
        pass

    def __init__(self, seq=()): # known special case of tuple.__init__
        """
        tuple() -> empty tuple
        tuple(iterable) -> tuple initialized from iterable‘s items
        
        If the argument is a tuple, the return value is the same object.
        # (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 __rmul__(self, n): # real signature unknown; restored from __doc__
        """ x.__rmul__(n) <==> n*x """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ T.__sizeof__() -- size of T in memory, in bytes """
        pass
6、字典(无序)
创建字典:
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person = {"name""mr.wu"‘age‘18}
person = dict({"name""mr.wu"‘age‘18})

常用操作:

  • 索引
  • 新增
  • 删除
  • 键、值、键值对
  • 循环
  • 长度
技术分享 dict
PS:循环,range,continue 和 break

其他

1、for循环
用户按照顺序循环可迭代对象中的内容,
PS:break、continue
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li = [11,22,33,44]
for item in li:
    print item
2、enumrate
为可迭代的对象添加序号
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li = [11,22,33]
for k,v in enumerate(li, 1):
    print(k,v)
3、range和xrange
指定范围,生成指定的数字
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print range(110)
# 结果:[1, 2, 3, 4, 5, 6, 7, 8, 9]
 
print range(1102)
# 结果:[1, 3, 5, 7, 9]
 
print range(300-2)
# 结果:[30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2]  

练习题

一、元素分类

有如下值集合 [11,22,33,44,55,66,77,88,99,90...],将所有大于 66 的值保存至字典的第一个key中,将小于 66 的值保存至第二个key的值中。
即: {‘k1‘: 大于66的所有值, ‘k2‘: 小于66的所有值}

二、查找
查找列表中元素,移除每个元素的空格,并查找以 a或A开头 并且以 c 结尾的所有元素。
    li = ["alec", " aric", "Alex", "Tony", "rain"]
    tu = ("alec", " aric", "Alex", "Tony", "rain") 
    dic = {‘k1‘: "alex", ‘k2‘: ‘ aric‘,  "k3": "Alex", "k4": "Tony"}
 
三、输出商品列表,用户输入序号,显示用户选中的商品
    商品 li = ["手机", "电脑", ‘鼠标垫‘, ‘游艇‘]
 
四、购物车

功能要求:

  • 要求用户输入总资产,例如:2000
  • 显示商品列表,让用户根据序号选择商品,加入购物车
  • 购买,如果商品总额大于总资产,提示账户余额不足,否则,购买成功。
  • 附加:可充值、某商品移除购物车
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goods = [
    {"name""电脑""price"1999},
    {"name""鼠标""price"10},
    {"name""游艇""price"20},
    {"name""美女""price"998},
]

 五、用户交互,显示省市县三级联动的选择

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dic = {
    "河北": {
        "石家庄": ["鹿泉""藁城""元氏"],
        "邯郸": ["永年""涉县""磁县"],
    }
    "河南": {
        ...
    }
    "山西": {
        ...
    }
 
}

Python开发【全栈-DAY-IV】:Python基本数据类型