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Python Create Dictionary with Integer

There sometimes comes a problem with how to initialize a dictionary in Python with 0 but what does this mean? In reality, it is just to create a dictionary where all the values are set to 0. The keys can be any desired set of keys, but the values associated with these keys will all be 0 initially. In this article, we will see how to create a dictionary with zeros in Python.

Create a Dictionary with Integer in Python

There are different methods to Create a Dictionary with Zeros in Python. Below we are explaining all the possible approaches with proper practical implementation.

  1. Initialize a Python dictionary with zero using basic dict initialization.
  2. Using a for-loop
  3. Using Dictionary Comprehension
  4. Using dict.fromkeys() Method
  5. Using collections.defaultdict()

Initialize a Python Dictionary with Integer

One of the most easiest ways is just to initialize dictionary with 0 is by using curly braces {} and putting all the values manually. However this method has a big disadvantage in that it does not work for many values.

Python3

# Method 1: Basic Dictionary Initialization
my_dict = {'apple': 0, 'banana': 0, 'orange': 0}
print(my_dict)

Output

{'apple': 0, 'banana': 0, 'orange': 0}

Create Dictionary with Integer Using a for loop

In this example, we are using a for loop to initialize dictionary Python to 0.

Python3

# Method 2: Using a For Loop
keys = ['apple', 'banana', 'orange']
 
 
my_dict = {}
for i in range(len(keys)):
    my_dict[keys[i]] =0
 
print(my_dict)

Output

{'apple': 0, 'banana': 0, 'orange': 0}

Create Dictionary with Zeros Using Dictionary Comprehension

In this method we utilize a dictionary comprehension to create a dictionary with specified keys and all values initialized to zero.

Python3

# Method 3: Using Dictionary Comprehension
keys = ['apple', 'banana', 'orange']
  
 
my_dict = {key: 0 for key in keys}
print(my_dict)

Output

{'apple': 0, 'banana': 0, 'orange': 0}

Initialize a Python Dictionary with Zero Using dict.fromkeys() Method

The dict.fromkeys() method is a built-in method to python initialize dict with zero.It creates a new dictionary with keys from the provided iterable and sets all corresponding values to the specified default value.

Python3

# Method 4: The dict.fromkeys() Method
keys = ['apple', 'banana', 'orange']
default_value = 0
 
my_dict = dict.fromkeys(keys, default_value)
print(my_dict)

Output

{'apple': 0, 'banana': 0, 'orange': 0}

Create Dictionary with Integer Using collections.defaultdict()

In this method, we used collections.defaultdict to create a dictionary with zeros, where the default value for any non-existing key is set to zero, streamlining the initialization process.

Python3

# Importing defaultdict from the collections module
from collections import defaultdict
 
# Defining the desired size of the dictionary
size = 5
 
# Creating a dictionary with zeros using a defaultdict
# The defaultdict uses int as the default factory, ensuring default values are set to zero
zero_dict = defaultdict(int, {i: 0 for i in range(size)})
 
# Printing the resulting dictionary
print( zero_dict)

Output

defaultdict(<class 'int'>, {0: 0, 1: 0, 2: 0, 3: 0, 4: 0})






Reffered: https://www.geeksforgeeks.org

Python

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Category:
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Sub Category:
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