Python - 将元组列表转换为具有给定起始值的键的字典

给定一个元组列表，下面的文章重点介绍如何将其转换为字典，键从指定的起始值开始。这个起始值只是为了提供一个良好的开端，下一个键将增加其前一个键的值。

Input : test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)], start = 4 
Output : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)} 
Explanation : Tuples indexed starting key count from 4.
Input : test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)], start = 6 
Output : {6: (4, 5), 7: (1, 3), 8: (9, 4), 9: (8, 2), 10: (10, 1)} 
Explanation : Tuples indexed starting key count from 6. 

方法一：使用循环

在这里，我们通过迭代每个元组并添加其位置索引来构建字典，从开始，作为字典中的键 - 值对。

Python3

# initializing list
test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing start
start = 4
  
res = dict()
for sub in test_list:
  
    # assigning positional index
    res[start] = sub
    start += 1
  
# printing result
print("Constructed dictionary : " + str(res))

输出：

The original list is : [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]

Constructed dictionary : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)}

方法 2：使用dict()和enumerate()

在这里，我们使用 dict() 将元组列表转换为字典，并使用 enumerate() 提供索引。

蟒蛇3

# initializing list
test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing start
start = 4
  
res = dict(enumerate(test_list, start=start))
  
# printing result
print("Constructed dictionary : " + str(res))

输出：

The original list is : [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]

Constructed dictionary : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)}