Python 字典练习

示例 1

Python程序通过从给定的字典中提取键来创建一个新的字典。

d1 = {"one":11, "two":22, "three":33, "four":44, "five":55}
keys = ['two', 'five']
d2={}
for k in keys:
   d2[k]=d1[k]
print (d2)

它将产生以下 输出 -

{'two': 22, 'five': 55}

示例 2

将Python程序转换为将字典转换为(k,v)元组的列表。

d1 = {"one":11, "two":22, "three":33, "four":44, "five":55}
L1 = list(d1.items())
print (L1)

它将产生以下 output −

[('one', 11), ('two', 22), ('three', 33), ('four', 44), ('five', 55)]

示例 3

Python程序用于删除字典中具有相同值的键。

d1 = {"one":"eleven", "2":2, "three":3, "11":"eleven", "four":44, "two":2}
vals = list(d1.values())#all values
uvals = [v for v in vals if vals.count(v)==1]#unique values
d2 = {}
for k,v in d1.items():
   if v in uvals:
      d = {k:v}
      d2.update(d)
print ("dict with unique value:",d2)

将产生以下输出：

输出 –

dict with unique value: {'three': 3, 'four': 44}