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📜  Python|从给定的元组列表中删除具有重复第一个值的元组

📅  最后修改于: 2022-05-13 01:55:44.300000             🧑  作者: Mango

Python|从给定的元组列表中删除具有重复第一个值的元组

给定一个元组列表，任务是从给定的元组列表中删除所有具有重复第一个值的元组。

例子： 

Input:  [(12.121, 'Tuple1'), (12.121, 'Tuple2'), 
         (12.121, 'Tuple3'), (923232.2323, 'Tuple4')]
Output:  [(12.121, 'Tuple1'), (923232.2323, 'Tuple4')]

Input:  [('Tuple1', 121), ('Tuple2', 125), 
         ('Tuple1', 135), ('Tuple4', 478)]
Output:  [('Tuple1', 121), ('Tuple2', 125), ('Tuple4', 478)]

以下是实现上述任务的一些方法。

方法#1：使用迭代

# Python code to remove tuples having 
# duplicate first value from given
# list of tuples
  
# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'), 
         (19212.22, 'India is best'), 
         (12.121, 'Cyware is best.'),
         (923232.2323, 'Jiit is best')]
  
# using set
visited = set()
  
# Output list initialization
Output = []
  
# Iteration
for a, b in Input:
    if not a in visited:
        visited.add(a)
        Output.append((a, b))
  
# Printing
print("Initial list of tuple is \n", Input)
print("List of tuple after removing duplicates:\n ", Output)
输出：


方法 #2：使用列表推导

# Python code to remove tuples having 
# duplicate first value from given
# list of tuples
  
# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'), 
         (19212.22, 'India is best'), 
         (19212.22, 'Cyware is best.'), 
         (923232.2323, 'Jiit is best')]
  
# Using set
seen = set()
  
# using list comprehension
Output = [(a, b) for a, b in Input 
         if not (a in seen or seen.add(a))]
  
# Printing
print("Initial list of tuple is" \n, Input)
print("\nList of tuple after removing duplicates \n", Output)
输出：


方法 #3：使用 itertools 

# Python code to remove tuples having 
# duplicate first value from given
# list of tuples
  
import itertools
  
# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'), 
         (19212.22, 'India is best'), 
         (923232.2323, 'Cyware is best.'), 
         (923232.2323, 'Jiit is best')]
  
# Using groupby
Output = ([next(b) for a, b in itertools.groupby(
                         Input, lambda y: y[0])])
  
# Printing
print("Initial list of tuple is\n", Input)
print("\nList of tuple after removing duplicates\n", Output)
输出：


方法#4：使用 OrderedDict

这是删除重复项最优雅的方法是使用 OrderedDict。 

# Python code to remove tuples having 
# duplicate first value from given
# list of tuples
  
from collections import OrderedDict
  
# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'), 
         (19212.22, 'India is best'), 
         (19212.22, 'Cyware is best.'), 
         (923232.2323, 'Jiit is best')]
  
# Using orderedDIct
Output = OrderedDict(Input).items()
  
# Printing
print("Initial list of tuple is\n", Input)
print("\nList of tuple after removing duplicates\n", Output)
输出：