Python | Remove tuples having duplicate first value from given list of tuples

# 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)

# 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)

# 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)

# 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)

# Python code to remove tuples having
# duplicate first value from given
# list of tuples


def remove_duplicates(lst):
    # Base case: if list is empty or has only one element
    if len(lst) <= 1:
        return lst
      
    else:
        # Compare the first tuple with the rest of the tuples
        for i in range(1, len(lst)):
            if lst[0][0] == lst[i][0]:
                lst.pop(i)
                return [lst[0]] + remove_duplicates(lst[1:])
              
        # Recursive call
        return [lst[0]] + remove_duplicates(lst[1:])


# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'),
         (19212.22, 'India is best'),
         (19212.22, 'Cyware is best.'),
         (923232.2323, 'Jiit is best')]

# Removing duplicates
Output = remove_duplicates(Input)

# printing the original list
print('Initial list of tuple is\n', Input)
# Printing the output list
print("List of tuple after removing duplicates \n", Output)

# this code contributed by tvsk

# Input list initialization
Input = [(12.121, 'Geeksforgeeks is best'),
         (19212.22, 'India is best'),
         (12.121, 'Cyware is best.'),
         (923232.2323, 'Jiit is best')]

# Dictionary to keep track of visited first values
visited = {}

# Output list initialization
Output = []

# Iterate through the list of tuples
for a, b in Input:
    # Check if the first value is already present in the dictionary
    if a not in visited:
        # If it is not present, add the key-value pair to the dictionary
        visited[a] = True
        # Append the tuple to the output list
        Output.append((a, b))

# Printing the results
print("Initial list of tuple is\n", Input)
print("List of tuple after removing duplicates:\n", Output)