Python |获取具有相同第一个值的元组的和
原文:https://www . geesforgeks . org/python-get-sum-of-tuples-具有相同的第一值/
给定元组列表，任务是对具有相同第一值的元组求和。
示例:
Input: [(1, 13), (2, 190), (3, 82), (1, 12)]
Output: [(1, 25), (2, 190), (3, 82)]
Input: [(1, 13), (1, 190), (3, 25), (1, 12)]
Output: [(1, 215), (3, 25)]
让我们讨论一下完成这项任务的不同方法。
方法#1: 使用map()
# Python code to get sum of tuples having same first value
# Initialisation of list of tuple
Input = [(1, 13), (1, 190), (3, 25), (1, 12)]
d = {x:0 for x, _ in Input}
for name, num in Input: d[name] += num
# using map
Output = list(map(tuple, d.items()))
# printing output
print(Output)
Output:
[(1, 215), (3, 25)]
方法 2: 使用defaultdict
# Python code to sum list of tuples having same first value
# Importing
from collections import defaultdict
# Initialisation of list of tuple
Input = [(2, 190), (1, 13), (1, 12),
(2, 14), (3, 82), (1, 70)]
# Initialisation of defaultdict
output = defaultdict(int)
for k, v in Input:
output[k] += v
# Printing output
print(list(output.items()))
Output:
[(1, 95), (2, 204), (3, 82)]
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