python3类型转换

拼搏现实的明天。 2023-02-19 15:20 104阅读 0赞

## 数值与字符串互转 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70]

# 数值转字符串
    numInt = 10
    numstr1 = str(numInt)
    
    numFloat = 10.5
    numstr2 = str(numFloat)
    
    # 字符串转数值
    strInt = '10'
    intNum = int(strInt)
    
    strFloat = '10.3'
    floatNum = float(strFloat)

## 字符串转列表、元组、集合 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70_pic_center]

# 字符串转表达式
    str = '2 + 5'
    result = eval(str) # 7
    
    # 字符串转列表
    str = 'python'
    strList = list(str) # ['p','y','t','h','o','n']
    
    # 字符串转元组
    str = 'linux'
    strTuple = tuple(str) # ('l','i','n','u','x')
    
    # 字符串转集合
    str = 'java'
    strSet = set(str) # {'j','a','v','a'}

## 列表、元组、集合、字典互转 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70_pic_center 1]

# 元组转字典
    tuple1 = (('a',100),('b',200))
    dict1 = dict(tuple1) # {'a':100,'b':200}
    
    # 列表转字典
    list1 = [['a',100],['b',200]]
    dict2 = dict(list1) # {'a':100,'b':20}
    
    # 元组嵌套列表转字典
    list1 = （['a',100],['b',200]）
    dict2 = dict(list1) # {'a':100,'b':20}
    
    # 列表嵌套元组转字典
    list1 = [('a',100),('b',200)]
    dict2 = dict(list1) # {'a':100,'b':20}
    
    # 多列表和zip转字典
    list1 = ['a','b','c']
    list2 = [1,2,3]
    zip1 = zip(list1,list2)
    dict3 = dict(zip1) # {'a':1，‘b’:2,'c':3}
    
    # 列表转元组
    list1 = [1,2,3]
    tuple1 = tuple(list1) # (1,2,3)
    
    # 列表转集合
    list1 = [1,2,3]
    set1 = set(list1) # {1,2,3}
    
    # 元组转列表
    tuple1 = (1,2,3)
    list1 = list(tuple1) # [1，2，3]
    
    # 元组转集合
    tuple1 = (1,2,3)
    set1 = set(tuple1)
    
    # 集合转元组
    set1 = { 1,2,3}
    tuple1 = tuple(set1)
    
    # 集合转列表
    set1 = { 1,2,3}
    list1 = list(set1) # [1,2,3]

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