【python】dict多种方法实现去除字典value为0 的元素

题目

dict多种方法实现去除字典value为0 的元素

栗子

a = {
          
   a: 1, b: 0, c: 3, d: 4, e: 5}

结果

a = {
          
   a: 1, c: 3, d: 4, e: 5}

code

方法一：普通方法

# 字典：value为0的移除
def removeDict():
    a = {
          
   a: 1, b: 0, c: 3, d: 4, e: 5}
    # 方法1
    res = {
          
   }
    for key, value in a.items():
        if value != 0:
            res[key] = value
    return res


if __name__ == __main__:
    result = removeDict()
    print(result)

结果：

{
          
   a: 1, c: 3, d: 4, e: 5}

方法二：pop方法

from copy import deepcopy

# 字典：value为0的移除
def removeDict():
    a = {
          
   a: 1, b: 0, c: 3, d: 4, e: 5}
    # 方法2
    res = deepcopy(a)
    for key, value in res.items():
        if value == 0:
            a.pop(key)
    return a


if __name__ == __main__:
    result = removeDict()
    print(result)

结果：

{
          
   a: 1, c: 3, d: 4, e: 5}

方法三：del方法

from copy import deepcopy

# 字典：value为0的移除
def removeDict():
    a = {
          
   a: 1, b: 0, c: 3, d: 4, e: 5}
    # 方法3
    res = deepcopy(a)
    for key, value in res.items():
        if value == 0:
            del a[key]
    return a

if __name__ == __main__:
    result = removeDict()
    print(result)

结果：

{
          
   a: 1, c: 3, d: 4, e: 5}

方法四：字典生成式

def removeDict():
    
    return {
          
   key: value for key, value in a.items() if value != 0}

if __name__ == __main__:
    result = removeDict()
    print(result)

结果：

{
          
   a: 1, c: 3, d: 4, e: 5}

通过上述四种方式实现了字典中value为0的元素删除，哪种方式更优需要自己感悟，这里不做过多的阐述；

汇总

from copy import deepcopy

# 字典：value为0的移除
def removeDict():
    a = {
          
   a: 1, b: 0, c: 3, d: 4, e: 5}
    # 方法1
    # b = {}
    # for key, value in a.items():
    #     if value != 0:
    #         b[key] = value
    # print(b)
    # 方法2
    # b = deepcopy(a)
    # for key, value in b.items():
    #     if value == 0:
    #         a.pop(key)
    # print(a)
    # 方法3
    # b = deepcopy(a)
    # for key, value in b.items():
    #     if value == 0:
    #         del a[key]
    # print(a)
    # 方法4
    res = {
          
   key: value for key, value in a.items() if value != 0}
    print(res)


if __name__ == __main__:
    removeDict()