Check if all values in a Dictionary are equal in Python

# Table of Contents

1. Check if all values in a Dictionary are equal in Python
2. Check if all values in a Dictionary are equal using a set
3. Check if all values in a Dictionary are equal using list.count()
4. Check if all values in a Dictionary are equal using a for loop

# Check if all values in a Dictionary are equal in Python

To check if all values in a dictionary are equal:

1. Use the dict.values() method to get the first value of the dictionary.
2. Use the all() function to iterate over the dictionary's values.
3. If all other dictionary values are equal to the first value, then the dictionary's values are equal.

Copied!
a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}

# ✅ Check if all values in dict are equal to a specific value

all_equal_to_5 = all(value == 5 for value in a_dict.values())
print(all_equal_to_5)  # 👉️ True

# -------------------------------------------------

# ✅ Check if all values in dict are equal

first_value = list(a_dict.values())[0]
print(first_value)  # 👉️ 5

all_equal = all(value == first_value for value in a_dict.values())
print(all_equal)  # 👉️ True

The first example checks if all of the values in a dictionary are equal to a specific value.

The second example checks if all of the values in a dictionary are equal.

We used the dict.values() method to get a view of the dictionary's values.

Copied!
a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}

# 👇️ dict_values([5, 5, 5])
print(a_dict.values())

The all() built-in function takes an iterable as an argument and returns True if all elements in the iterable are truthy (or the iterable is empty).

We passed a generator expression to the all() function.

On each iteration, we compare the current dictionary value to the number 5 and return the result.

Copied!
a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}

all_equal_to_5 = all(value == 5 for value in a_dict.values())
print(all_equal_to_5)  # 👉️ True

if all_equal_to_5:
    # 👇️ this runs
    print('All values in the dictionary are equal to the specified value')
else:
    print('Not all values in the dictionary are equal to the specified value')

If the condition isn't met at least once, the all() function short-circuits and returns False.

You can use the same approach if you simply need to check if all of the values in a dictionary are equal.

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a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}

first_value = list(a_dict.values())[0]
print(first_value)  # 👉️ 5

all_equal = all(value == first_value for value in a_dict.values())
print(all_equal)  # 👉️ True

We used the list() class to convert the view of the dictionary's values to a list to be able to access the first value.

The last step is to compare the first value to all other values in the dictionary.

Alternatively, you can use a set object.

# Check if all values in a Dictionary are equal using a set

This is a three-step process:

1. Use the set() class to convert the dictionary's values to a set object.
2. Use the len() function to get the length of the set.
3. If the set has a length of 1, then all values in the dictionary are equal.

Copied!
a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}


all_equal = len(set(a_dict.values())) == 1
print(all_equal)  # 👉️ True

The set() class takes an iterable optional argument and returns a new set object with elements taken from the iterable.

The last step is to use the len() function to get the length of the set object and compare the result to 1.

If the set has a length of 1, then all values in the dictionary are equal.

Alternatively, you can use the list.count() method.

# Check if all values in a Dictionary are equal using list.count()

This is a three-step process:

1. Use the dict.values() method to get the first value in the dictionary.
2. Convert the dictionary's values to a list.
3. Use the list.count() method to check if the occurrences of the first value are equal to the dictionary's length.

Copied!
a_dict = {
    'bobby': 5,
    'hadz': 5,
    'com': 5
}


first_value = list(a_dict.values())[0]

all_equal = list(a_dict.values()).count(first_value) == len(a_dict)
print(all_equal)  # 👉️ True

The list.count() method takes a value and returns the number of times the provided value appears in the list.

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my_list = [None, None, None]

print(my_list.count(None))  # 👉️ 3

print(my_list.count('hello'))  # 👉️ 0

If the number of occurrences of the first value in the dictionary is equal to the dictionary's length, then all values in the dictionary are equal.

# Check if all values in a Dictionary are equal using a for loop

This is a four-step process:

1. Use the dict.values() method to get a view of the dictionary's values.
2. Use a for loop to iterate over the view object.
3. Check if each value is not equal to the first value.
4. Break out of the loop if the condition is met.

Copied!
a_dict = {
    'bobby': 0,
    'hadz': 0,
    'com': 0
}


all_values_equal = True

first_value = list(a_dict.values())[0]

for value in a_dict.values():
    if value != first_value:
        all_values_equal = False
        break

print(all_values_equal)  # 👉️ True

We initialized the all_values_equal variable to True.

On each iteration of the for loop, we check if the current value is not equal to the first value.

The break statement breaks out of the innermost enclosing for or while loop.

If all of the values in the dictionary are equal, the condition in the if statement is never met and the all_values_equal variable remains set to True.

Which approach you pick is a matter of personal preference. I'd use the all() function because I find it quite intuitive and direct.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• Check if multiple Keys exist in a Dictionary in Python
• Check if a nested key exists in a Dictionary in Python
• Check if a value exists in a List of Dictionaries in Python